0001262039-15-000009 | 10-K | XBRL Viewer

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Stockholders' Equity , Range of Options (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2014 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding (in shares) \| shares	10,702
Options Exercisable, Number Exercisable (in shares) \| shares	9,125
Range, 0.98 to 1.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	$ 0.98
Exercise Price, maximum (in dollars per share)	$ 1.2
Options Outstanding, Number Outstanding (in shares) \| shares	646
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	1 year 2 months 2 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 1.04
Options Exercisable, Number Exercisable (in shares) \| shares	642
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1.04
Range, 3.74 to 4.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	3.74
Exercise Price, maximum (in dollars per share)	$ 4.65
Options Outstanding, Number Outstanding (in shares) \| shares	2,844
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	9 months 17 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 3.75
Options Exercisable, Number Exercisable (in shares) \| shares	2,844
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 3.75
Range, 5.50 to 6.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	5.5
Exercise Price, maximum (in dollars per share)	$ 6.25
Options Outstanding, Number Outstanding (in shares) \| shares	83
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	1 year 9 months 27 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.66
Options Exercisable, Number Exercisable (in shares) \| shares	83
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.66
Range, 8.43 to 8.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	8.43
Exercise Price, maximum (in dollars per share)	$ 8.99
Options Outstanding, Number Outstanding (in shares) \| shares	1,050
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	2 years 2 months 7 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.53
Options Exercisable, Number Exercisable (in shares) \| shares	1,049
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.53
Range, 15.28 to 19.94 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	15.28
Exercise Price, maximum (in dollars per share)	$ 19.94
Options Outstanding, Number Outstanding (in shares) \| shares	177
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	3 years 6 months 9 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 16.33
Options Exercisable, Number Exercisable (in shares) \| shares	143
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.52
Range, 20.13 to 24.92 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	20.13
Exercise Price, maximum (in dollars per share)	$ 24.92
Options Outstanding, Number Outstanding (in shares) \| shares	3,884
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	3 years 9 months
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 21.32
Options Exercisable, Number Exercisable (in shares) \| shares	2,988
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 21.10
Range, 26.49 to 26.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum (in dollars per share)	26.49
Exercise Price, maximum (in dollars per share)	$ 26.7
Options Outstanding, Number Outstanding (in shares) \| shares	2,018
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	4 years 2 months 4 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 26.69
Options Exercisable, Number Exercisable (in shares) \| shares	1,376
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 26.70

Inventory (Tables)

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Inventory [Table Text Block]

Inventory consisted of the following (in thousands):



	December 31, 2014		December 31, 2013
Raw materials	$	10,617	$	8,355
Finished goods	58,860		40,317
Inventory	$	69,477	$	48,672

Property and Equipment—Net

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT—Net

Property and equipment—net consisted of the following (in thousands):



	December 31, 2014			December 31, 2013
Land	$	13,895		$	13,895
Building and building improvements	20,166			610
Evaluation units	31,474			23,442
Computer equipment and software	31,821			22,442
Furniture and fixtures	5,096			1,697
Construction-in-progress	3,902			10,947
Leasehold improvements	7,998			5,417
Total property and equipment	114,352			78,450
Less: accumulated depreciation	(55,433		)	(41,798		)
Property and equipment—net	$	58,919		$	36,652

In March 2014, we moved into our new corporate headquarters and estimated the useful life of the building and related improvements to be 20 years.

Depreciation expense was $20.5 million, $13.9 million and $10.5 million in fiscal 2014, fiscal 2013 and fiscal 2012, respectively.

Net Income Per Share , Anti Dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	4,336	10,590	7,795
Stock Options [Member] \| Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	3,469	7,397	7,183
Restricted Stock Units (RSUs) [Member] \| Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	768	2,774	291
ESPP [Member] \| Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	99	419	321

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Document Information [Line Items]
Entity Registrant Name	FORTINET INC
Entity Central Index Key	0001262039
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Amendment Flag	false
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		168,865,460
Entity Public Float			$ 3,163,303,736

Summary of Significant Accounting Policies , Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2014
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years
Evaluation units [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Minimum [Member] \| Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Minimum [Member] \| Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Maximum [Member] \| Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Maximum [Member] \| Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years

Net Income Per Share , Calculation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Line Items]
Net income	$ 25,343	$ 44,273	$ 66,836
Basic shares:
Weighted-average common shares outstanding-basic (in shares)	163,831	162,435	158,074
Diluted shares:
Weighted-average common shares outstanding-basic (in shares)	163,831	162,435	158,074
Effect of potentially dilutive securities:
Weighted-average shares used to compute diluted net income per share (in shares)	169,289	168,183	166,329
Basic (in dollars per share)	$ 0.15	$ 0.27	$ 0.42
Diluted (in dollars per share)	$ 0.15	$ 0.26	$ 0.40
Stock Options [Member]
Effect of potentially dilutive securities:
Employee stock options and purchase rights (in shares)	4,583	5,685	8,214
Restricted Stock Units (RSUs) [Member]
Effect of potentially dilutive securities:
Employee stock options and purchase rights (in shares)	844	35	0
ESPP [Member]
Effect of potentially dilutive securities:
Employee stock options and purchase rights (in shares)	31	28	41

Stockholders' Equity , Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Tax withholding upon vesting of restricted stock awards	$ 10,598	$ 1,452	$ 0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance, beginning	4,199	830	0
Granted	4,047	4,104	873
Forfeited	(472)	(507)	(43)
Vested	(1,483)	(228)	0
Balance, ending	6,291	4,199	830
RSUs expected to vest—December 31, 2014	5,933
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Balance, weighted-average grant-date fair value per share (in dollars per share)—beginning	$ 22.00	$ 23.73	$ 0.00
Granted, weighted-average grant-date fair value per share (in dollars per share)	23.13	21.75	23.79
Forfeited, weighted-average grant-date fair value per share (in dollars per share)	21.92	21.48	24.76
Vested, weighted-average grant-date fair value per share (in dollars per share)	22.23	23.89	0.00
Balance, weighted-average grant-date fair value per share (in dollars per share)—ending	22.93	$ 22.00	$ 23.73
RSUs expected to vest, weighted-average grant-date fair value per share (in dollars per share)—December 31, 2012	$ 22.90
Compensation cost not yet recognized	$ 136,400
Compensation cost not yet recognized period of recognition	2 years 11 months 1 day
Shares withheld for taxes	461	70	0
Tax withholding upon vesting of restricted stock awards	$ 10,598	$ 1,452	$ 0

Summary of Significant Accounting Policies , Cash, Cash Equivalents and Available-for-sale Investments (Details)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Short-term investments, minimum original maturity	3 months
Short-term investments, maximum original maturity	1 year
Long-term investments, minimum original maturity	1 year

Stockholders' Equity , ESPP Information (Details) - Employee Stock Purchase Plan [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term in years	6 months	6 months	6 months
Volatility	34.10%	44.00%	53.70%
Risk-free interest rate	0.10%	0.10%	0.10%
Dividend rate	0.00%	0.00%	0.00%
Weighted-average fair value per share granted (in dollars per share)	$ 5.91	$ 6.11	$ 7.06
Shares issued under the ESPP (in shares)	770	672	577
Weighted-average price per share issued (in dollars per share)	$ 18.17	$ 18.88	$ 18.90

Business Combinations

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

BUSINESS COMBINATIONS

Coyote Point Systems

On March 21, 2013, we acquired all of the outstanding equity securities of Coyote, a provider of application delivery, load balancing and acceleration solutions, for $6.0 million in cash. The acquisition also included a contingent obligation for up to $5.5 million in future earn-out payments to former stockholders of Coyote, if specified future operational objectives, service conditions and financial results were met within two years of the acquisition date. As the future earn-out payments were contingent upon one of Coyote’s former stockholder’s employment during the earn-out period, the estimated fair value of these contingent obligations was recorded as compensation expense ratably over the earn-out periods. During fiscal 2014, we determined that the contingent earn-out payment thresholds will not be met due to decreases in the projected revenue of Coyote following the acquisition, and reversed the entire $1.9 million carrying amount of the previously recorded liability for contingent consideration.

We accounted for this acquisition as a purchase of a business and, accordingly, the total purchase price was allocated to Coyote’s identifiable tangible and intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The fair value assigned to the intangible assets acquired was determined using the income approach which discounts expected cash flows to present value using our estimates and assumptions.

The following table summarizes the fair value of assets acquired and liabilities assumed (in thousands):



Cash and cash equivalents	$	206
Other current assets	501
Finite-lived intangible assets	2,800
Indefinite-lived intangible assets	2,600
Goodwill	2,824
Other assets	88
Total assets acquired	9,019
Current liabilities	1,030
Long-term liabilities	2,004
Total liabilities assumed	3,034
Total purchase price	$	5,985

Of the total acquired finite intangible assets, we allocated $2.3 million to developed technology, $0.5 million to customer relationships, and $2.6 million to in-process research and development (“IPR&D”) as of the acquisition date. Developed technology and customer relationships are being amortized on a straight-line basis, each over an initial estimated useful life of six years, as cost of revenue and sales and marketing expense, respectively. During the three months ended September 30, 2013, we completed the development of technology associated with the IPR&D projects, and started amortizing this developed technology as Cost of product revenue ratably on a straight-line basis over an estimated useful life of five years. During fiscal 2014, we recorded an impairment charge of $2.4 million related to the finite-lived intangible assets as Cost of product revenue in the consolidated statements of operations.

The goodwill of $2.8 million represents the premium we paid over the fair value of the net tangible liabilities assumed and identified intangible assets acquired, due primarily to acquire developed and in-process technology. None of the goodwill recognized as a result of the acquisition is deductible for income tax purposes. The financial results of this acquisition were considered immaterial for purposes of pro-forma financial disclosures.

Other Fiscal 2013 Acquisition

In September 2013, we acquired certain assets of Xtera Communications, Inc. (“Xtera”), including certain load balancing solutions and certain patents, for a total consideration of $1.8 million, of which $1.7 million was paid in cash on the acquisition date and $0.1 million in cash was contingent upon attainment of revenue milestones. In connection with this acquisition, we acquired net tangible assets of $0.2 million, intangible assets of $1.5 million, and recognized an estimated contingent obligation of $0.1 million payable upon attainment of revenue milestones.

The results of operations of our fiscal 2013 acquisitions have been included in our consolidated statements of operations from their respective acquisition dates.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1524-128463

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7000-128479

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4922-128472

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4934-128472

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4926-128472

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1383-128463

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

Income Taxes , Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Taxes [Line Items]
Income tax benefit from employee stock option plans	$ 43	$ 3,460	$ 14,278
Deferred tax assets:
Net operating loss carryforward	1,293	2,183
Deferred revenue	31,545	47,341
Nondeductible reserves and accruals	20,904	16,055
Depreciation and amortization	193	(465)
General business credit carryforward	2,155	439
Stock-based compensation	16,463	15,468
Other	11	17
Total deferred tax assets	72,564	$ 81,038
Foreign earnings deemed to be permanently reinvested overseas	21,300
Federal [Member]
Deferred Taxes [Line Items]
Amount of unrecognized deferred tax asset relating to tax credits for excess tax benefits for stock-based compensation expense	6,500
Deferred tax assets:
Net operating loss carryforwards	22,900
Tax credit carryforwards	5,500
California [Member]
Deferred Taxes [Line Items]
Amount of unrecognized deferred tax asset relating to tax credits for excess tax benefits for stock-based compensation expense	3,300
Deferred tax assets:
Net operating loss carryforwards	6,900
Tax credit carryforwards	$ 5,200

Deferred Revenue

12 Months Ended

Dec. 31, 2014

Deferred Revenue Disclosure [Abstract]

DEFERRED REVENUE

Deferred revenue consisted of the following (in thousands):



	December 31, 2014		December 31, 2013
Product	$	4,642	$	2,915
Services and other	554,115		429,713
Total deferred revenue	$	558,757	$	432,628
Reported As:
Current	$	368,929	$	293,664
Non-current	189,828		138,964
Total deferred revenue	$	558,757	$	432,628

Inventory

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

INVENTORY

Inventory consisted of the following (in thousands):



	December 31, 2014		December 31, 2013
Raw materials	$	10,617	$	8,355
Finished goods	58,860		40,317
Inventory	$	69,477	$	48,672

Inventory includes finished goods held by distributors where revenue is recognized on a sell-through basis of $1.2 million and $0.9 million as of December 31, 2014 and 2013, respectively. Inventory also includes materials at contract manufacturers to be used in production of $4.8 million and $4.3 million as of December 31, 2014 and 2013, respectively.

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2014
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS The son of one member of our Board of Directors is a partner of an outside law firm that we utilize for certain complex litigation matters. Expenses for legal services provided by the law firm related to matters that arose subsequent to the member joining our Board of Directors were $1.7 million and $0.1 million in fiscal 2014 and fiscal 2013, respectively. There were no such legal services in fiscal 2012. Amounts due and payable to the law firm were $1.3 million and $0.3 million as of December 31, 2014 and December 31, 2013, respectively.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

Investments in Privately-Held Companies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($) privately_held_company	Dec. 31, 2013 USD ($) privately_held_company
Investments, All Other Investments [Abstract]
Investments in equity securities of privately-held companies \| $	$ 4.4	$ 2.0
Number of privately-held companies \| privately_held_company	2	1

Summary of Significant Accounting Policies , Concentration of Credit Risk (Details) - Customer Concentration Risk [Member] - customers	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers accounting for 10% or more of concentration risk	1	1
Percentage from a single customer	18.00%	13.00%
Sales Revenue [Member]
Concentration Risk [Line Items]
Number of customers accounting for 10% or more of concentration risk	1	1	1
Percentage from a single customer	15.00%	12.00%	11.00%

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2000	Jan. 02, 2011	Nov. 17, 2009	Jan. 28, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuances	55,405,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term in years	4 years 9 months 18 days	4 years 6 months 29 days	4 years 7 months 6 days
Volatility, minimum	41.00%	45.00%	46.00%
Volatility, maximum	45.00%	48.00%	52.00%
Risk-free interest rate		1.20%
Risk-free interest rate, minimum	1.60%		0.70%
Risk-free interest rate, maximum	1.70%		0.90%
Dividend rate	0.00%	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance - Beginning (in shares)	15,521,000	18,571,000	21,389,000
Granted (in shares)	387,000	258,000	3,401,000
Forfeited (in shares)	(443,000)	(820,000)	(1,441,000)
Exercised (in shares)	(4,763,000)	(2,488,000)	(4,778,000)
Balance - Ending (in shares)	10,702,000	15,521,000	18,571,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Balance - Beginning (in dollars per share)	$ 13.18	$ 12.40	$ 9.14
Granted (in dollars per share)	23.08	20.89	26.38
Forfeited (in dollars per share)	24.21	22.14	19.31
Exercised (in dollars per share)	8.91	5.18	5.69
Balance - Ending (in dollars per share)	$ 14.98	13.18	12.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options vested and expected to vest, Outstanding (in shares)	10,668,000
Options vested and expected to vest, Weighted average exercise price (in dollars per share)	$ 14.96
Options vested and expected to vest, Weighted average remaining contractual life (in years)	2 years 8 months 15 days
Options vested and expected to vest, Aggregate intrinsic value	$ 167,477
Options exercisable, Outstanding (in shares)	9,125,000
Options exercisable, Weighted average exercise price (in dollars per share)	$ 13.45
Options exercisable, Weighted average remaining contractual life (in years)	2 years 4 months 17 days
Options exercisable, Aggregate intrinsic value	$ 157,027
Compensation cost not yet recognized	$ 17,600
Compensation cost not yet recognized period of recognition	1 year 5 months 15 days
Weighted-average fair value per share granted	$ 8.90	$ 8.42	$ 11.13
Intrinsic value of options exercised	$ 76,731	$ 41,484	$ 92,323
Total fair value of awards vested	$ 17,098	$ 26,411	$ 25,350
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	5,980,737
Maximum employee subscription rate		15.00%
Purchase price of common stock as percentage of lower of fair market value of common stock on first day of offering period or last day of purchase period		85.00%
Stock Options and Restricted Stock Units, Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuances	16,993,000
Reserved for Future Option, Restricted Stock Unit and Other Equity Award Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuances	32,431,000
Reserved for Future ESPP Issuances [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuances	5,981,000
Stock Plans 2000, 2008 and 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuances	49,424,143
Stock Plan, 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					21,500,000
Stock Plan, 2000 [Member] \| Stock Options, Nonqualifying [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options					85.00%
Award vesting period					4 years
Stock Plan, 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized								5,000,000
Stock Plan, 2009 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized				21,000,000
Number of shares authorized before adjustments				9,000,000
Individual Owning 10 Percent or More of Stock [Member] \| Stock Plan, 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options					110.00%
Minimum stock ownership percent triggering early award expiration					10.00%
Individual Owning 10 Percent or More of Stock [Member] \| Stock Plan, 2000 [Member] \| Stock Options, Nonqualifying [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option contractual term	5 years
Individual Owning 10 Percent or More of Stock [Member] \| Stock Plan, 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options								110.00%
Minimum stock ownership percent triggering early award expiration								10.00%
Individual Owning 10 Percent or More of Stock [Member] \| Stock Plan, 2009 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options							110.00%
Minimum stock ownership percent triggering early award expiration				10.00%
Award expiration period				5 years
Employee [Member] \| Stock Plan, 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options								100.00%
Employee [Member] \| Stock Plan, 2009 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options				100.00%
Directors and Other Service Providers [Member] \| Stock Plan, 2008 [Member] \| Stock Options, Nonqualifying [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options								100.00%
Directors and Other Service Providers [Member] \| Stock Plan, 2009 [Member] \| Stock Options, Nonqualifying [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of market price for non-statutory options				100.00%
Individual Owning 10 Percent or Less of Stock [Member] \| Stock Plan, 2000 [Member] \| Stock Options, Nonqualifying [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option contractual term	10 years
Individual Owning 10 Percent or Less of Stock [Member] \| Stock Plan, 2009 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Maximum stock ownership percent triggering early award expiration				10.00%
Option contractual term				7 years
Share-based Compensation Award Authorized Number Changes, Lesser of Fixed Amount of Shares [Member] \| Stock Plan, 2009 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, maximum						7,000,000
Share-based Compensation Award Authorized Number Changes, Lesser of Outstanding Shares on Last Day of Preceeding Year [Member] \| Stock Plan, 2009 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase to number of shares authorized, maximum, percent						5.00%

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 25,343	$ 44,273	$ 66,836
Other comprehensive (loss) income—net of taxes:
Foreign currency translation (losses) gains	(333)	(1,617)	524
Unrealized (losses) gains on investments	(1,708)	(587)	3,331
Tax benefit (provision) related to items of other comprehensive income or loss	600	205	(1,166)
Other comprehensive (loss) income—net of taxes	(1,441)	(1,999)	2,689
Comprehensive income	$ 23,902	$ 42,274	$ 69,525

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):



	Year Ended December 31,
	2014		2013		2012
Numerator:
Net income	$	25,343	$	44,273	$	66,836

Denominator:
Basic shares:
Weighted-average common stock outstanding-basic	163,831		162,435		158,074
Diluted shares:
Weighted-average common stock outstanding-basic	163,831		162,435		158,074
Effect of potentially dilutive securities:
Stock options	4,583		5,685		8,214
RSUs	844		35		—
ESPP	31		28		41
Weighted-average shares used to compute diluted net income per share	169,289		168,183		166,329
Net income per share:
Basic	$	0.15	$	0.27	$	0.42
Diluted	$	0.15	$	0.26	$	0.40

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following weighted-average shares of common stock were excluded from the computation of diluted net income per share for the periods presented, as their effect would have been antidilutive (in thousands):



	Year Ended December 31,
	2014	2013	2012
Stock options	3,469	7,397	7,183
RSUs	768	2,774	291
ESPP	99	419	321
	4,336	10,590	7,795

Summary of Significant Accounting Policies , Foreign Currency Translation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Foreign currency transaction gains (losses)	$ (3.2)	$ (1.5)	$ (0.5)

Accumulated Other Comprehensive (Loss) Income (Changes in Accumulated Balances of Other Comprehensive Income)(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance	$ 1,092	$ 3,091
Other comprehensive income before reclassifications	(1,099)	(1,990)
Amounts reclassified from accumulated other comprehensive income	(342)	(9)
Net current-period other comprehensive income	(1,441)	(1,999)
Ending balance	(349)	1,092
Accumulated Other Comprehensive Income, Tax [Roll Forward]
Beginning balance, tax	(409)	(614)
Other comprehensive income before reclassifications, tax	595	200
Amounts reclassified from accumulated other comprehensive income, tax	5	5
Net current-period other comprehensive income, tax	600	205
Ending balance, tax	191	(409)
Foreign Currency Translation Gains and Losses [Member]
Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance	333	1,950
Other comprehensive income before reclassifications		(1,617)
Amounts reclassified from accumulated other comprehensive income	(333)	0
Net current-period other comprehensive income	(333)	(1,617)
Ending balance	0	333
Unrealized Gains and Losses on Investments [Member]
Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance	1,168	1,755
Other comprehensive income before reclassifications	(1,694)	(573)
Amounts reclassified from accumulated other comprehensive income	(14)	(14)
Net current-period other comprehensive income	(1,708)	(587)
Ending balance	$ (540)	$ 1,168

Summary of Significant Accounting Policies , Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
CAD
Derivative [Line Items]
Notional amount of forward exchange contracts	$ 6,879	$ 21,867

Income Taxes , Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at federal statutory tax rate	$ 21,542	$ 26,579	$ 36,749
Stock-based compensation expense	7,367	4,571	1,570
State taxes—net of federal benefit	975	419	1,186
Domestic production activities deduction	0	(3,256)	(1,813)
Foreign tax credit	(4,433)	(2,853)	(2,348)
Research and development credit	(880)	(1,650)	(144)
Foreign income taxed at different rates	(406)	2,927	(1,626)
Foreign withholding taxes	9,085	6,622	2,185
Other	2,956	(1,691)	2,401
Total provision for income taxes	$ 36,206	$ 31,668	$ 38,160

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business—Fortinet, Inc. (“Fortinet”) was incorporated in Delaware in November 2000 and is a leading provider of network security appliances to enterprises, service providers and government organizations worldwide. Fortinet’s solutions are designed to integrate multiple levels of security protection, including firewall, virtual private networking, application control, anti-malware, intrusion prevention, web filtering, vulnerability management, anti-spam, wireless controller, and WAN acceleration. Our security solutions are fast and secure and designed to provide broad, high-performance protection against dynamic security threats while simplifying the IT infrastructure of our end-customers worldwide.

Basis of Presentation and Preparation—The consolidated financial statements of Fortinet and its wholly owned subsidiaries (collectively, the “Company,” “we,” “us” or “our”) have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). All intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates—The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Such management estimates include implicit service periods for revenue recognition, litigation and settlement costs and other loss contingencies, sales returns reserve and allowance for doubtful accounts, inventory valuation, warranty reserve, goodwill and other long-lived assets, investments, stock-based compensation, accounting for income taxes related to deferred tax asset balances and reserves, and accounting for business combinations. We base our estimates on historical experience and also on assumptions that we believe are reasonable. Actual results could differ from those estimates.

Certain Significant Risks and Uncertainties—We are subject to certain risks and uncertainties that could have a material adverse effect on our future financial position or results of operations, such as the following: changes in level of demand for our products and services, the timing and success of new product and service introductions by us or our competitors, price and sales competition and our ability to adapt to changing market conditions and dynamics such as changes in end-customer, distributor or reseller requirements or market needs, changes in expenses caused, for example, by fluctuations in foreign currency exchange rates, management of inventory, internal control over financial reporting, market acceptance of our new products and services, demand for products and services in general, seasonality, failure of our channel partners to perform or other disruption in our channel, the quality of our products and services and the market perception of our response to new viruses or security breaches, general economic conditions, challenges in doing business outside of the United States, changes in customer relationships, litigation, or claims against us based on intellectual property, patent, product regulatory or other factors, product obsolescence, and our ability to attract and retain qualified employees.

We utilize suppliers and independent contract manufacturers for certain of our components and a third-party logistics company for distribution of certain of our products, which is located outside of United States. The inability of any of these parties to fulfill our supply and logistics requirements could negatively impact our future operating results.

Concentration of Credit Risk—Financial instruments that subject us to concentrations of credit risk consist primarily of cash, cash equivalents, short-term and long-term investments, and accounts receivable. We maintain our cash, cash equivalents, and investments in fixed income securities with major financial institutions in order to limit the exposure of each investment. Deposits held with banks may exceed the amount of insurance provided on such deposits.

Our accounts receivables are primarily derived from our channel partners in various geographical locations. We perform ongoing credit evaluations of our customers. We generally do not require collateral on accounts receivable and we maintain reserves for estimated potential credit losses.

As of December 31, 2014 and December 31, 2013, one distributor, Exclusive Networks Group accounted for 18% and 13% of total accounts receivable, respectively.

During fiscal 2014, fiscal 2013 and fiscal 2012, one distributor, Exclusive Networks Group accounted for 15%, 12% and 11% of total revenue, respectively.

Financial Instruments and Fair Value—We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. Due to their short-term nature, the carrying amounts reported in the consolidated financial statements approximate the fair value for accounts receivable, accounts payable, accrued liabilities, and accrued payroll and compensation.

Comprehensive Income—Comprehensive income includes certain changes in equity from non-owner sources that are excluded from net income, specifically, unrealized gains and losses on available-for-sale investments.

Foreign Currency Translation and Transaction Gains and Losses—Prior to the third quarter of fiscal 2014, the assets and liabilities of our international subsidiaries were translated into U.S. dollars using the applicable exchange rates. The resulting foreign translation adjustments were included in the consolidated balance sheets as a component of accumulated other comprehensive income (loss) and in the consolidated statements of comprehensive income.

In the third quarter of fiscal 2014, we reevaluated the selected functional currency of our international subsidiaries due to the nature of our business operations and recorded the cumulative impact of the reevaluation of the functional currency in the consolidated statement of operations. Subsequently, the remeasurement of the assets and liabilities of all international subsidiaries has been recorded in the consolidated statement of operations prospectively. The impact of this reevaluation is not material for our fiscal 2014 or any of our previously issued financial statements.

As of December 31, 2014, the functional currency of our foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities denominated in foreign currencies have been remeasured into U.S. dollars using the exchange rates in effect at the balance sheet dates. Foreign currency denominated income and expenses have been remeasured using the average exchange rates in effect during each period. Foreign currency remeasurement losses of $3.2 million, $1.5 million and $0.5 million, are included in Other expense—net for fiscal 2014, fiscal 2013 and fiscal 2012, respectively.

Cash, Cash Equivalents and Available-for-sale Investments—We consider all highly liquid investments, purchased with original maturities of three months or less, to be cash equivalents. Cash and cash equivalents consist of balances with banks and highly liquid investments in money market funds, commercial paper, and certificates of deposit and term deposits.

We classify our investments as available-for-sale at the time of purchase since it is our intent that these investments are available for current operations. Investments with original maturities greater than three months that mature less than one year from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments.

Investments are considered to be impaired when a decline in fair value is judged to be other-than-temporary. We consult with our investment managers and consider available quantitative and qualitative evidence in evaluating potential impairment of our investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, we evaluate, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and our intent and ability to hold the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.

For debt securities in an unrealized loss position which is deemed to be other-than-temporary, the difference between the security’s then-current amortized cost basis and fair value is separated into (i) the amount of the impairment related to the credit loss (i.e., the credit loss component) and (ii) the amount of the impairment related to all other factors (i.e., the non-credit loss component). The credit loss component is recognized in earnings. The non-credit loss component is recognized in accumulated other comprehensive loss.

Other Investments—Investments in privately held companies where we own less than 20% of the voting stock and have no indicators of significant influence over operating and financial policies of those companies are included in other assets in the consolidated balance sheets and are accounted for under the cost method. For these non-quoted investments, we regularly review the assumptions underlying the operating performance and cash flow forecasts based on information provided by these privately held companies. If it is determined that an other-than-temporary decline exists in an equity security, we write down the investment to its fair value and record the related impairment as an investment loss in our consolidated statements of operations.

Inventory—Inventory is recorded at the lower of cost (using the first-in, first-out method) or market, after we give appropriate consideration to obsolescence and inventory in excess of anticipated future demand. In assessing the ultimate recoverability of inventory, we are required to make estimates regarding future customer demand, the timing of new product introductions, economic trends and market conditions. If the actual product demand is significantly lower than forecasted, we could be required to record additional inventory write-downs, which could have an adverse impact on our gross margins and profitability.

Property and Equipment—Property and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets as follows:



	Estimated Useful Lives
Building and building improvements	20 years
Evaluation units	1 year
Computer equipment and software	1 - 2 years
Furniture and fixtures	3 - 5 years
Leasehold improvements	Shorter of useful life or lease term

Impairment of Long-Lived Assets—We evaluate events and changes in circumstances that could indicate carrying amounts of long-lived assets, including intangible assets, may not be recoverable. When such events or changes in circumstances occur, we assess the recoverability of long-lived assets by determining whether the carrying value of such assets will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of those assets, we record an impairment charge in the period in which we make the determination. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets.

Goodwill —Goodwill represents the excess of purchase consideration over the estimated fair value of net assets of businesses acquired in a business combination. Goodwill acquired in a business combination are not amortized, but instead tested for impairment at least annually during the fourth quarter. We perform our annual goodwill impairment analysis at the reporting unit level. As of December 31, 2014, we had one reporting unit.

In reviewing goodwill for impairment we have the option to (i) assess qualitative factors to determine whether it is more-likely-than-not that the fair value of the reporting unit is less than its carrying amount or (ii) bypass the qualitative assessment and proceed directly to a quantitative assessment. If we opt to perform a qualitative assessment, the factors we may review include, but are not limited to (a) macroeconomic conditions; (b) industry and market considerations; (c) cost factors; (d) overall financial performance; (e) other relevant entity-specific events such as changes in management, strategy, customers, or litigation; (f) events affecting the reporting unit; or (g) or sustained decrease in share price. If we believe, as a result of the qualitative assessment, that it is more-likely-than-not that the fair value of the reporting unit is less than its carrying amount, the quantitative impairment test will be required. Otherwise, no further testing will be required. A quantitative assessment utilizes a two-step process. In the first step, the fair value of the reporting unit is determined, and is compared against its carrying amount, including goodwill. We consider a combination of an income-based approach using projected discounted cash flows and a market-based approach using multiples of comparable companies to determine the fair value. The fair value of the reporting unit is estimated using significant judgment based on a combination of the income and the market approaches. Under the income approach, we estimate fair value of the reporting unit based on the present value of forecasted future cash flows that the reporting unit is expected to generate over its remaining life. Under the market approach, we estimate fair value of our reporting unit based on an analysis that compares the value of the reporting unit to values of other companies in similar lines of business. If the fair value of the reporting unit is less than its carrying value, then we perform the second step to measure the amount of impairment loss. The amount of impairment is determined by comparing the implied fair value of reporting unit goodwill to the carrying value of the goodwill. When the carrying value of the reporting unit's goodwill exceeds its implied fair value, we record an impairment loss equal to the difference. We have not been required to perform this second step of the process because the fair value of our reporting unit exceeded the net book value as of December 31, 2014.

Determining the fair value of the reporting unit requires us to make judgments and involves the use of significant estimates and assumptions. These estimates and assumptions include revenue growth rates and operating margins used to calculate projected future cash flows, operating trends, risk-adjusted discount rates, future economic and market conditions and determination of appropriate market comparables. We base our fair value estimates on assumptions we believe to be reasonable but that are unpredictable and inherently uncertain. Actual future results may differ from those estimates. We may also test goodwill for impairment between annual tests in the presence of impairment indicators.

Other Intangible Assets—Intangible assets with finite lives are carried at cost, less accumulated amortization. Amortization is computed using the straight-line method over the estimated economic lives of the assets, which range from one to five years.

Deferred Revenue—Deferred revenue consists of amounts that have been invoiced but that have not yet been recognized as revenue. This generally includes security subscription and technical support services which are invoiced upfront and delivered over twelve months or longer.

Income Taxes—We record income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our financial statements or tax returns. In estimating future tax consequences, generally all expected future events other than enactments or changes in the tax law or rates are considered. We assess the likelihood that some portion or all of our deferred tax assets will be recovered from future taxable income within the respective jurisdictions, and to the extent we believe that recovery does not meet the “more-likely-than-not” standard, based solely on its technical merits as of the reporting date, we establish a valuation allowance.

We account for uncertain tax positions in accordance with GAAP, which defines the confidence level that a tax position must meet in order to be recognized in the financial statements. The tax effects of a position are recognized only if it is “more likely than not” to be sustained based solely on its technical merits as of the reporting date. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may require periodic adjustments and which may not accurately anticipate actual outcomes.

We operate in various tax jurisdictions and are subject to audit by various tax authorities. We provide for tax contingencies whenever it is deemed more likely than not that a tax asset has been impaired or a tax liability has been incurred for events such as tax claims or changes in tax laws. Tax contingencies are based upon their technical merits, relevant tax law and the specific facts and circumstances as of each reporting period. Changes in facts and circumstances could result in material changes to the amounts recorded for such tax contingencies.

Stock-Based Compensation Expense—We have elected to use the Black-Scholes option pricing model to determine the fair value of our employee stock options and ESPP. The fair value of RSUs is based on the closing market price of our common stock on the date of grant. Stock-based compensation expense, net of estimated forfeitures, is amortized on a straight-line basis. PSUs are RSUs that contain both service-based and market-based vesting conditions. PSUs vest over a specified service period upon the satisfaction of certain market-based vesting conditions, and settle into shares of our common stock upon vesting over a two- or three-year period. The fair value of a PSU is calculated using the Monte Carlo simulation model on the date of grant and is based on the market price of our common stock on the date of grant modified to reflect the impact of the market-based vesting condition, including the estimated payout level based on that condition. We do not adjust compensation cost for subsequent changes in the expected outcome of the market-based vesting conditions.

Advertising Expense—Advertising costs are expensed when incurred and are included in operating expenses in the accompanying consolidated statements of operations. Our advertising expenses were not significant for any periods presented.

Research and Development Costs—Research and development costs are expensed as incurred.

Software Development Costs—The costs to develop software have not been capitalized as we believe our current software development process is essentially completed concurrent with the establishment of technological feasibility.

Revenue Recognition—We derive the majority of our revenue from sales of our hardware, software, FortiGuard security subscription services and FortiCare technical support services, and other services through our channel partners and a direct sales force.

Revenue is recognized when all of the following criteria have been met:


•	Persuasive evidence of an arrangement exists. Binding contracts or purchase orders are generally used to determine the existence of an arrangement.


•	Delivery has occurred or services have been rendered. Delivery occurs when we fulfill an order and title and risk of loss has been transferred. Services revenue is deferred and recognized ratably over the contract service period, which is typically from one to three years and is generally recognized upon delivery or completion of service.


•	Sales price is fixed or determinable. We assess whether the sales price is fixed or determinable based on the payment terms associated with the transaction and when the sales price is deemed final.


•	Collectability is reasonably assured. We assess collectability based primarily on creditworthiness as determined by credit checks, analysis, and payment history.

We recognize product revenue for sales to distributors that have no general right of return and direct sales to end-customers upon shipment, based on general revenue recognition accounting guidance once all other revenue recognition criteria have been met. Certain distributors are granted stock rotation rights, limited rights of return, as well as rebates for sales of our products. The arrangement fee for this group of distributors is not typically fixed or determinable when products are shipped and revenue is therefore deferred and recognized upon sell-through. For sales that include end-customer acceptance criteria, revenue is recognized upon acceptance.

Substantially all of our products have been sold in combination with services, which consist of security subscriptions and technical support services. Security services provide access to our antivirus, intrusion prevention, web filtering, and anti-spam functionality. Support services include rights to unspecified software upgrades, maintenance releases and patches, telephone and Internet access to technical support personnel, and hardware support. We recognize revenue from these services ratably over the contractual service period. Revenue related to subsequent renewals of these services are recognized over the term of the renewal agreement.

We offer certain sales incentives to channel partners. We reduce revenue for estimates of sales returns and allowances and record reductions to revenue for rebates and estimated commitments related to price protection and other customer incentive programs. Additionally, in limited circumstances, we may permit end-customers, distributors and resellers to return our products, subject to varying limitations, for a refund within a reasonably short period from the date of purchase. We estimate and record reserves for sales incentives and sales returns based on historical experience.

Our sales arrangements typically contain multiple elements, such as hardware, subscription, technical support and other services. The majority of our hardware appliance products contain our operating system software that together function to deliver the essential functionality of the product. Our products and services generally qualify as separate units of accounting. We allocate revenue to each unit of accounting based on an estimated selling price using vendor-specific objective evidence (“VSOE”) of selling price, if it exists, or third-party evidence (“TPE”) of selling price. If neither VSOE nor TPE of selling price exist for a deliverable, we use our best estimate of selling price (“BESP”) for that deliverable. Revenue allocated to each element is then recognized when the basic revenue recognition criteria are met for each element.

We determine VSOE of fair value for elements of an arrangement based on the historical pricing and discounting practices for those services when sold separately. In establishing VSOE, we require that a substantial majority of the selling prices for a service fall within a reasonably narrow pricing range, generally evidenced by a substantial majority of such historical stand-alone transactions falling within a reasonably narrow range as a percentage of list price. We are typically not able to determine TPE for our products or services. TPE is determined based on competitor prices for similar deliverables when sold separately, which is generally unavailable. For our hardware appliances, we use BESP as our selling price. For our support and other services, we generally use VSOE as our selling price estimate. When we are unable to establish a selling price using VSOE for our support and other services, we use BESP in our allocation of arrangement consideration. We determine BESP for a product or service by considering multiple historical factors including, but not limited to, cost of products, gross margin objectives, pricing practices, geographies, customer classes and distribution channels that fall within a reasonably narrow range as a percentage of list price.

For multiple-element arrangements where software deliverables are included, revenue is allocated to the non-software deliverables and to the software deliverables as a group using the relative estimated selling prices of each of the deliverables in the arrangement based on the estimated selling price hierarchy. The amount allocated to the software deliverables is then allocated to each software deliverable using the residual method when VSOE of fair value exists. If evidence of VSOE of fair value of one or more undelivered elements does not exist, all software allocated revenue is deferred and recognized when delivery of those elements occurs or when fair value can be established. When the undelivered element for which we do not have VSOE of fair value is support, revenue for the entire arrangement is recognized ratably over the support period. The same residual method and VSOE of fair value principles apply for our multiple element arrangements that contain only software elements.

Accounts Receivable—Trade accounts receivable are recorded at the invoiced amount, net of sales returns reserve and allowances for doubtful accounts. The sales returns reserve is determined based on specific criteria including agreements to provide rebates and other factors known at the time, as well as estimates of the amount of goods shipped that will be returned. To determine the adequacy of the sales returns reserve, we analyze historical experience of actual rebates and returns as well as current product return information. The sales returns reserves was $5.8 million and $4.6 million as of December 31, 2014 and 2013, respectively. The allowance for doubtful accounts is determined based on our assessment of the collectability of customer accounts. The allowance for doubtful accounts was $0.4 million as of December 31, 2014. The allowance for doubtful accounts is not material as of December 31, 2013.

Warranties—We generally provide a 1-year warranty on hardware products and a 90-day warranty on software. A provision for estimated future costs related to warranty activities is recorded as a component of cost of product revenues when the product revenue is recognized, based upon historical product failure rates and historical costs incurred in correcting product failures. In the event we change our warranty reserve estimates, the resulting charge against future cost of sales or reversal of previously recorded charges may materially affect our gross margins and operating results.

Accrued warranty activities are summarized as follows (in thousands):



	Year Ended December 31,
	2014			2013			2012
Accrued warranty balance—beginning of the period	$	3,037		$	2,309		$	2,582
Warranty costs incurred	(3,653		)	(3,444		)	(2,669		)
Provision for warranty for the year, including warranty liabilities assumed in connection with an acquisition	5,209			3,965			2,639
Adjustment related to pre-existing warranties	(324		)	207			(243		)
Accrued warranty balance—end of the period	$	4,269		$	3,037		$	2,309

Foreign Currency Derivatives—Our sales contracts are primarily denominated in U.S. dollars and therefore substantially all of our revenue is not subject to foreign currency translation risk. However, a substantial portion of our operating expenses incurred outside the U.S. are denominated in foreign currencies and are subject to fluctuations due to changes in foreign currency exchange rates, particularly changes in the Canadian dollar (“CAD”). To help protect against significant fluctuations in value and the volatility of future cash flows caused by changes in currency exchange rates, we engage in foreign currency risk management activities to hedge balance sheet items denominated in CAD. We do not use these contracts for speculative or trading purposes. All of the derivative instruments are with high quality financial institutions and we monitor the creditworthiness of these parties. These contracts typically have maturities between one and three months. We record changes in the fair value of forward exchange contracts related to balance sheet accounts as Other expense—net in the consolidated statement of operations.

Additionally, independent of any hedging activities, fluctuations in foreign currency exchange rates may cause us to recognize transaction gains and losses in our consolidated statements of operations. Our hedging activities are intended to reduce, but not eliminate, the impact of currency exchange rate movements. As our hedging activities are relatively short-term in nature and are focused on CAD, long-term material changes in the value of the U.S. dollar against other foreign currencies, such as the EUR, GBP and CNY could adversely impact our operating expenses in the future.

The notional amount of forward exchange contracts to hedge balance sheet accounts as of December 31, 2014 and 2013 were (in thousands):



	Buy/Sell	Notional
Balance Sheet Contracts:
Currency—As of December 31, 2014
CAD	Buy	$	6,879

Currency—As of December 31, 2013
CAD	Buy	$	21,867

Reclassification

Beginning in fiscal 2014, the amounts previously reported as Ratable and other revenue have been combined with the amounts previously reported as Services revenue in the consolidated statements of operations. The combined amounts are now being presented as Services and other revenue in the consolidated statements of operations. The related Cost of revenue and Gross profit have also been combined to conform to the current period presentation. The Ratable and other revenue amounts are not material, and the reclassification did not have any impact on our gross margin or net income.

Recent Accounting Pronouncement

In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09 (Topic 606) - Revenue from Contracts with Customers (“ASU 2014-09”) to create a single, joint revenue standard that is consistent across all industries and markets for companies that prepare their financial statements in accordance with GAAP. Under ASU 2014-09, an entity is required to recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to receive in exchange for those goods or services. ASU 2014-09 is effective for us beginning on January 1, 2017. We are currently evaluating the impact ASU 2014-09 will have on our consolidated financial statements.

Property and Equipment—Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 114,352	$ 78,450
Less: accumulated depreciation	(55,433)	(41,798)
Property and equipment - net	58,919	36,652
Depreciation expense	20,500	13,900	$ 10,500
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	13,895	13,895
Building and building improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 20,166	610
Estimated useful life of the building and improvements	20 years
Evaluation units [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 31,474	23,442
Estimated useful life of the building and improvements	1 year
Computer equipment and software [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 31,821	22,442
Furniture and fixtures [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	5,096	1,697
Construction-in-progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	3,902	10,947
Leasehold improvements and tooling [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property and equipment	$ 7,998	$ 5,417

Stockholders' Equity

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Stock-Based Compensation Plans

Our stock-based compensation plans include the 2000 Stock Plan (the “2000 Plan”), the 2008 Stock Plan (the “2008 Plan”), the 2009 Equity Incentive Plan (the “2009 Plan”), and the 2011 Employee Stock Purchase Plan (the “ESPP”).

2000 Stock Plan—In 2000, we adopted the 2000 Plan, which includes both incentive and non-statutory stock options. Under the 2000 Plan, we may grant options to purchase up to 21.5 million shares of common stock to employees, directors and other service providers at prices not less than the fair market value at date of grant for incentive stock options and not less than 85% of fair market value for non-statutory options. Options granted to a person who, at the time of the grant, owns more than 10% of the voting power of all classes of stock shall be at no less than 110% of the fair market value and expire five years from the date of grant. All other options generally have a contractual term of 10 years. Options generally vest over four years.

2008 Stock Plan—In 2008, our board of directors approved the 2008 Plan, which includes both incentive and non-statutory stock options. The maximum aggregate number of shares which may be subject to options and sold under the 2008 Plan is 5.0 million shares, plus any shares that, as of the date of stockholder approval of the 2008 Plan, have been reserved but not issued under the 2000 Plan or shares subject to stock options or similar awards granted under the 2000 Plan that expire or otherwise terminate without having been exercised in full or that are forfeited to or repurchased by us.

Under the 2008 Plan, we may grant options to employees, directors and other service providers. In the case of an incentive stock option granted to an employee, who at the time of grant, owns stock representing more than 10% of the total combined voting power of all classes of stock, the exercise price shall be no less than 110% of the fair market value per share on the date of grant and expire five years from the date of grant, and options granted to any other employee, the per share exercise price shall be no less than 100% of the fair market value per share on the date of grant. In the case of a nonstatutory stock option and options granted to other service providers, the per share exercise price shall be no less than 100% of the fair market value per share on the date of grant.

2009 Equity Incentive Plan—In 2009, our board of directors approved the 2009 Plan, which includes awards of stock options, stock appreciation rights, restricted stock, RSUs, and Performance Stock Units (“PSUs”). The maximum aggregate number of shares that may be issued under the 2009 Plan is 9.0 million shares, plus any shares subject to stock options or similar awards granted under the 2008 Plan and the 2000 Plan that expire or otherwise terminate without having been exercised in full and shares issued pursuant to awards granted under the 2008 Plan and the 2000 Plan that are forfeited to or repurchased by us, with the maximum number of shares to be added to the 2009 Plan pursuant to such terminations, forfeitures and repurchases not to exceed 21.0 million shares. The shares may be authorized, but unissued or reacquired common stock. The number of shares available for issuance under the 2009 Plan will be increased on the first day of each fiscal year beginning with fiscal 2011, in an amount equal to the lesser of (i) 7.0 million shares, (ii) five percent (5%) of the outstanding shares on the last day of the immediately preceding fiscal year, or (iii) such number of shares determined by our board of directors. Under the 2009 Plan, we may grant awards to employees, directors and other service providers. In the case of an incentive stock option granted to an employee who, at the time of the grant, owns stock representing more than 10% of the voting power of all classes of stock, the exercise price shall be no less than 110% of the fair market value per share on the date of grant and expire five years from the date of grant, and options granted to any other employee, the per share exercise price shall be no less than 100% of the fair market value per share on the date of grant. In the case of a non-statutory stock option and options granted to other service providers, the per share exercise price shall be no less than 100% of the fair market value per share on the date of grant. Options granted to individuals owning less than 10% of the total combined voting power of all classes of stock generally have a contractual term of seven years and options generally vest over four years.

As of December 31, 2014, a total of 49.4 million shares were authorized and available for issuance under the 2000 Plan, 2008 Plan and 2009 Plan.

2011 Employee Stock Purchase Plan—In June 2011, our stockholders approved the ESPP. The ESPP permits eligible employees to purchase common stock through regular, systematic payroll deductions, up to a maximum of 15% of employees’ compensation for each purchase period at purchase prices equal to 85% of the lesser of the fair market value of our common stock at the first trading date of the applicable offering period or the purchase date. As of December 31, 2014, 6.0 million shares were authorized and available for future issuance under the ESPP.

Employee Stock Options

In determining the fair value of our employee stock options, we use the Black-Scholes option pricing model, which employs the following assumptions.

Valuation method—We estimate the fair value of stock options granted.

Expected Term—The expected term represents the period that our stock-based awards are expected to be outstanding. Beginning in the first quarter of fiscal 2014, we changed the methodology of calculating the expected term. We believe that we have sufficient historical experience for determining the expected term of the stock option award, and therefore, we calculated our expected term based on historical experience instead of using the simplified method.

Expected Volatility—The expected volatility of our common stock has been historically based on the weighted-average implied and historical volatility of our and our peer group. The peer group is comprised of comparable companies in the same industry sector. As we gained more historical volatility data, the weighting of our own data in the expected volatility calculation associated with options gradually increased to 100% by the fourth quarter of fiscal 2014.

Fair Value of Common Stock—The fair value of our common stock is the closing sales price of the common stock (or the closing bid, if no sales were reported) on the effective on the date of grant.

Risk-Free Interest Rate—We base the risk-free interest rate used in the Black-Scholes valuation model on the implied yield available on U.S. Treasury zero-coupon issues with an equivalent remaining term.

Expected Dividend—The expected dividend weighted-average assumption is zero.

The following table summarizes the weighted-average assumptions relating to our employee stock options:



	Year Ended December 31,
	2014		2013		2012
Expected term in years	4.8		4.6		4.6
Volatility	41% – 45%		45% – 48%		46% – 52%
Risk-free interest rate	1.6% – 1.7%		1.2	%	0.7% – 0.9%
Dividend rate	—	%	—	%	—	%

The following table summarizes the stock option activity and related information for the periods presented below (in thousands, except exercise prices and contractual life):



	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Balance—December 31, 2011	21,389		$	9.14
Granted	3,401		26.38
Forfeited	(1,441	)	19.31
Exercised	(4,778	)	5.69
Balance—December 31, 2012	18,571		12.40
Granted	258		20.89
Forfeited	(820	)	22.14
Exercised	(2,488	)	5.18
Balance—December 31, 2013	15,521		13.18
Granted	387		23.08
Forfeited	(443	)	24.21
Exercised	(4,763	)	8.91
Balance—December 31, 2014	10,702		$	14.98
Options vested and expected to vest—December 31, 2014	10,668		$	14.96	2.71	$	167,477
Options exercisable—December 31, 2014	9,125		$	13.45	2.38	$	157,027

The aggregate intrinsic value represents the pre-tax difference between the exercise price of stock options and the quoted market price of our common stock on December 31, 2014, for all in-the-money options. As of December 31, 2014, total compensation expense related to unvested stock options granted to employees but not yet recognized was $17.6 million, net of estimated forfeitures. This expense is expected to be amortized on a straight-line basis over a weighted-average period of 1.5 years.

Additional information related to our stock options is summarized below (in thousands, except per share amounts):



	Year Ended December 31,
	2014		2013		2012
Weighted-average fair value per share granted	$	8.90	$	8.42	$	11.13
Intrinsic value of options exercised	76,731		41,484		92,323
Fair value of options vested	17,098		26,411		25,350

The following table summarizes information about outstanding and exercisable stock options as of December 31, 2014, as follows (in thousands, except exercise prices and contractual life):



	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted- Average Remaining Contractual Life (Years)	Weighted- Average Exercise Price		Number Exercisable	Weighted- Average Exercise Price
$0.98–$1.20	646	1.17	$	1.04	642	$	1.04
3.74–4.65	2,844	0.80	3.75		2,844	3.75
5.50–6.25	83	1.82	5.66		83	5.66
8.43–8.99	1,050	2.19	8.53		1,049	8.53
15.28–19.94	177	3.52	16.33		143	15.52
20.13–24.92	3,884	3.75	21.32		2,988	21.10
26.49–26.70	2,018	4.18	26.69		1,376	26.70
	10,702				9,125

Restricted Stock Units

The following table summarizes the activity and related information for RSUs for the periods presented below (in thousands, except per share amounts):



	Restricted Stock Units Outstanding
	Number of Shares		Weighted-Average Grant-Date-Fair Value per Share
Balance—December 31, 2011	—		$	—
Granted	873		23.79
Forfeited	(43	)	24.76
Vested	—		—
Balance—December 31, 2012	830		23.73
Granted	4,104		21.75
Forfeited	(507	)	21.48
Vested	(228	)	23.89
Balance—December 31, 2013	4,199		22.00
Granted	4,047		23.13
Forfeited	(472	)	21.92
Vested	(1,483	)	22.23
Balance—December 31, 2014	6,291		$	22.93
RSUs expected to vest—December 31, 2014	5,933		$	22.90

As of December 31, 2014, total compensation expense related to unvested RSUs that were granted to employees and non-employees under the 2009 Plan, but not yet recognized, was $136.4 million, net of estimated forfeitures. This expense is expected to be amortized on a straight-line basis over a weighted-average vesting period of 2.92 years.

RSUs settle into shares of common stock upon vesting. Upon the vesting of the RSUs, we net-settle the RSUs and withhold a portion of the shares to satisfy minimum statutory employee withholding taxes. Total payment for the employees’ tax obligations to the taxing authorities is reflected as a financing activity within the consolidated statements of cash flows.

The following summarizes the number and value of the shares withheld for employee taxes (in thousands):



	Year Ended December 31,
	2014		2013		2012
Shares withheld for taxes	461		70		—
Amount withheld for taxes	$	10,598	$	1,452	$	—

Performance Stock Units

During fiscal 2014, we granted PSUs to certain of our executive officers. Based on the achievement of the market-based vesting conditions during the performance period, the final settlement of the PSUs will range between 0% and 150% of the target shares underlying the PSUs based on a specified objective formula approved by our Compensation Committee. The PSUs entitle our executive officers to receive a number of shares of our common stock based on the performance of our stock price over a two- or three-year period as compared to the NASDAQ Composite index for the same periods.

The following table summarizes the weighted-average assumptions relating to our PSUs:



	Year Ended December 31,
	2014		2013
Expected term in years	3.0		3.0
Volatility	46.3	%	50.1	%
Risk-free interest rate	0.9	%	0.7	%
Dividend rate	—	%	—	%

We granted 0.1 million PSUs during fiscal 2014 to our executive officers. The PSUs had a grant date fair value of $21.05 per share, and are included in the aforementioned activity for RSUs. We granted 0.2 million PSUs during fiscal 2013, of which 0.1 million shares were forfeited during fiscal 2013. The PSUs had a grant date fair value of $22.06 per share. No PSUs were granted in fiscal 2012.

As of December 31, 2014, total compensation expense related to unvested PSUs that were granted to certain of our executive officers, but not yet recognized, was $3.2 million, net of estimated forfeitures. This expense is expected to be amortized on a straight-line basis over a weighted-average vesting period of 2.00 years.

Shares Reserved for Future Issuances

The following table presents the common stock reserved for future issuance (in thousands):



	December 31, 2014
Outstanding stock options and RSUs	16,993
Reserved for future stock option, RSU and other equity award grants	32,431
Reserved for future ESPP issuances	5,981
Total common stock reserved for future issuances	55,405

Employee Stock Purchase Plan

In determining the fair value of our ESPP, we use the Black-Scholes option pricing model that employs the following weighted-average assumptions:



	Year Ended December 31,
	2014		2013		2012
Expected term in years	0.5		0.5		0.5
Volatility	34.1	%	44.0	%	53.7	%
Risk-free interest rate	0.1	%	0.1	%	0.1	%
Dividend rate	—	%	—	%	—	%

Additional information related to the ESPP is provided below (in thousands, except per share amounts):



	Year Ended December 31,
	2014		2013		2012
Weighted-average fair value per share granted	$	5.91	$	6.11	$	7.06
Shares issued under the ESPP	770		672		577
Weighted-average price per share issued	$	18.17	$	18.88	$	18.90

Stock-based Compensation Expense

Stock-based compensation expense is included in costs and expenses as follows (in thousands):



	Year Ended December 31,
	2014		2013		2012
Cost of product revenue	$	483	$	383	$	333
Cost of services and other revenue	5,826		4,841		3,736
Research and development	17,264		13,271		9,226
Sales and marketing	26,744		19,526		12,793
General and administrative	8,677		6,450		4,602
Total stock-based compensation expense	$	58,994	$	44,471	$	30,690

The following table summarizes stock-based compensation expense by award type (in thousands):



	Year Ended December 31,
	2014		2013		2012
Stock options	$	17,555	$	20,806	$	24,506
RSUs	37,068		18,968		1,714
ESPP	4,371		4,697		4,470
Total stock-based compensation expense	$	58,994	$	44,471	$	30,690

Total income tax benefit associated with stock-based compensation that is recognized in the consolidated statements of operations is as follows (in thousands):



	Year Ended December 31,
	2014		2013		2012
Income tax benefit associated with stock-based compensation	$	11,086	$	8,331	$	5,870

Share Repurchase Program

On December 6, 2013, our Board of Directors authorized a Share Repurchase Program (“the Program”) to repurchase up to $200.0 million of our outstanding common stock through December 31, 2014. Under the Program, share repurchases may be made by us from time to time in privately negotiated transactions or in open market transactions. The Program does not require us to purchase a minimum number of shares, and may be suspended, modified or discontinued at any time without prior notice. On October 17, 2014, our board of directors extended the share repurchase authorization under the Program through December 31, 2015. In fiscal 2014, we repurchased 1.6 million shares of common stock under the Program in open market transactions for an aggregate purchase price of $38.6 million. As of December 31, 2014, $122.5 million remains available for future share repurchases under the Program.

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUE:
Product	$ 360,558	$ 278,046	$ 248,948
Services and other	409,806	337,251	284,691
Total revenue	770,364	615,297	533,639
COST OF REVENUE:
Product	151,300	114,611	93,971
Services and other	79,709	66,032	53,449
Total cost of revenue	231,009	180,643	147,420
GROSS PROFIT:
Product	209,258	163,435	154,977
Services and other	330,097	271,219	231,242
Total gross profit	539,355	434,654	386,219
OPERATING EXPENSES:
Research and development	122,880	102,660	81,078
Sales and marketing	315,804	224,991	179,155
General and administrative	41,347	34,913	25,511
Total operating expenses	480,031	362,564	285,744
OPERATING INCOME	59,324	72,090	100,475
INTEREST INCOME	5,393	5,306	5,006
OTHER EXPENSE—Net	(3,168)	(1,455)	(485)
INCOME BEFORE INCOME TAXES	61,549	75,941	104,996
PROVISION FOR INCOME TAXES	36,206	31,668	38,160
NET INCOME	$ 25,343	$ 44,273	$ 66,836
Net income per share (Note 8):
Basic (in dollars per share)	$ 0.15	$ 0.27	$ 0.42
Diluted (in dollars per share)	$ 0.15	$ 0.26	$ 0.40
Weighted-average shares outstanding:
Basic (in shares)	163,831	162,435	158,074
Diluted (in shares)	169,289	168,183	166,329

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions And Allocation of Recognized Period Costs [Table Text Block]

The following table summarizes the weighted-average assumptions relating to our employee stock options:



	Year Ended December 31,
	2014		2013		2012
Expected term in years	4.8		4.6		4.6
Volatility	41% – 45%		45% – 48%		46% – 52%
Risk-free interest rate	1.6% – 1.7%		1.2	%	0.7% – 0.9%
Dividend rate	—	%	—	%	—	%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes the stock option activity and related information for the periods presented below (in thousands, except exercise prices and contractual life):



	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Balance—December 31, 2011	21,389		$	9.14
Granted	3,401		26.38
Forfeited	(1,441	)	19.31
Exercised	(4,778	)	5.69
Balance—December 31, 2012	18,571		12.40
Granted	258		20.89
Forfeited	(820	)	22.14
Exercised	(2,488	)	5.18
Balance—December 31, 2013	15,521		13.18
Granted	387		23.08
Forfeited	(443	)	24.21
Exercised	(4,763	)	8.91
Balance—December 31, 2014	10,702		$	14.98
Options vested and expected to vest—December 31, 2014	10,668		$	14.96	2.71	$	167,477
Options exercisable—December 31, 2014	9,125		$	13.45	2.38	$	157,027

Additional information related to our stock options is summarized below (in thousands, except per share amounts):



	Year Ended December 31,
	2014		2013		2012
Weighted-average fair value per share granted	$	8.90	$	8.42	$	11.13
Intrinsic value of options exercised	76,731		41,484		92,323
Fair value of options vested	17,098		26,411		25,350

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table summarizes information about outstanding and exercisable stock options as of December 31, 2014, as follows (in thousands, except exercise prices and contractual life):



	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted- Average Remaining Contractual Life (Years)	Weighted- Average Exercise Price		Number Exercisable	Weighted- Average Exercise Price
$0.98–$1.20	646	1.17	$	1.04	642	$	1.04
3.74–4.65	2,844	0.80	3.75		2,844	3.75
5.50–6.25	83	1.82	5.66		83	5.66
8.43–8.99	1,050	2.19	8.53		1,049	8.53
15.28–19.94	177	3.52	16.33		143	15.52
20.13–24.92	3,884	3.75	21.32		2,988	21.10
26.49–26.70	2,018	4.18	26.69		1,376	26.70
	10,702				9,125

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The following table summarizes the activity and related information for RSUs for the periods presented below (in thousands, except per share amounts):



	Restricted Stock Units Outstanding
	Number of Shares		Weighted-Average Grant-Date-Fair Value per Share
Balance—December 31, 2011	—		$	—
Granted	873		23.79
Forfeited	(43	)	24.76
Vested	—		—
Balance—December 31, 2012	830		23.73
Granted	4,104		21.75
Forfeited	(507	)	21.48
Vested	(228	)	23.89
Balance—December 31, 2013	4,199		22.00
Granted	4,047		23.13
Forfeited	(472	)	21.92
Vested	(1,483	)	22.23
Balance—December 31, 2014	6,291		$	22.93
RSUs expected to vest—December 31, 2014	5,933		$	22.90

Schedule of Share-based Compensation, Shares Withheld for Taxes [Table Text Block]

The following summarizes the number and value of the shares withheld for employee taxes (in thousands):



	Year Ended December 31,
	2014		2013		2012
Shares withheld for taxes	461		70		—
Amount withheld for taxes	$	10,598	$	1,452	$	—

Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions [Table Text Block]

The following table summarizes the weighted-average assumptions relating to our PSUs:



	Year Ended December 31,
	2014		2013
Expected term in years	3.0		3.0
Volatility	46.3	%	50.1	%
Risk-free interest rate	0.9	%	0.7	%
Dividend rate	—	%	—	%

Schedule of Shares Reserved for Future Issuance [Table Text Block]

The following table presents the common stock reserved for future issuance (in thousands):



	December 31, 2014
Outstanding stock options and RSUs	16,993
Reserved for future stock option, RSU and other equity award grants	32,431
Reserved for future ESPP issuances	5,981
Total common stock reserved for future issuances	55,405

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

In determining the fair value of our ESPP, we use the Black-Scholes option pricing model that employs the following weighted-average assumptions:



	Year Ended December 31,
	2014		2013		2012
Expected term in years	0.5		0.5		0.5
Volatility	34.1	%	44.0	%	53.7	%
Risk-free interest rate	0.1	%	0.1	%	0.1	%
Dividend rate	—	%	—	%	—	%

Schedule of Share-based Payment Award Employee Stock Purchase Plan Additional Information [Table Text Block]

Additional information related to the ESPP is provided below (in thousands, except per share amounts):



	Year Ended December 31,
	2014		2013		2012
Weighted-average fair value per share granted	$	5.91	$	6.11	$	7.06
Shares issued under the ESPP	770		672		577
Weighted-average price per share issued	$	18.17	$	18.88	$	18.90

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Stock-based compensation expense is included in costs and expenses as follows (in thousands):



	Year Ended December 31,
	2014		2013		2012
Cost of product revenue	$	483	$	383	$	333
Cost of services and other revenue	5,826		4,841		3,736
Research and development	17,264		13,271		9,226
Sales and marketing	26,744		19,526		12,793
General and administrative	8,677		6,450		4,602
Total stock-based compensation expense	$	58,994	$	44,471	$	30,690

Schedule of Employee Service Share based Compensation Allocation of Recognized Period Costs by Award Type [Table Text Block]

The following table summarizes stock-based compensation expense by award type (in thousands):



	Year Ended December 31,
	2014		2013		2012
Stock options	$	17,555	$	20,806	$	24,506
RSUs	37,068		18,968		1,714
ESPP	4,371		4,697		4,470
Total stock-based compensation expense	$	58,994	$	44,471	$	30,690

Income Tax Benefit from Stock Option Plans [Table Text Block]

Total income tax benefit associated with stock-based compensation that is recognized in the consolidated statements of operations is as follows (in thousands):



	Year Ended December 31,
	2014		2013		2012
Income tax benefit associated with stock-based compensation	$	11,086	$	8,331	$	5,870

Goodwill and Other Intangible Assets - Net

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS - NET

GOODWILL AND OTHER INTANGIBLE ASSETS—Net

We recorded $2.8 million of goodwill from the acquisition of Coyote. There were no impairments to goodwill during fiscal 2014.

During fiscal 2014, we reassessed the fair value and the remaining useful life of the developed technologies and customer relationships acquired from Coyote. Based on this reassessment, we recorded an impairment charge of $2.4 million to adjust the total fair value of the other intangible assets to $2.0 million. The impairment charge is included within Cost of product revenue in the consolidated statements of operations.

The following tables present other intangible assets—net (in thousands):



	December 31, 2014
	Weighted-Average Useful Life (in Years)	Gross		Accumulated Amortization		Net
Other intangible assets—net:
Developed technology	3.6	$	5,606	$	3,128	$	2,478
Customer relationships	6.0	500		146		354
Total other intangible assets—net		$	6,106	$	3,274	$	2,832



	December 31, 2013
	Weighted-Average Useful Life (in Years)	Gross		Accumulated Amortization		Net
Other intangible assets—net:
Developed technology	4.6	$	8,971	$	2,568	$	6,403
Customer relationships	6.0	500		62		438
Total other intangible assets—net		$	9,471	$	2,630	$	6,841

Amortization expense was $1.5 million, $1.7 million, and $1.0 million in fiscal 2014, fiscal 2013 and fiscal 2012, respectively. The following table summarizes estimated future amortization expense of Other intangible assets—net for future fiscal years (in thousands):



	Amount
Fiscal Years:
2015	$	1,091
2016	785
2017	425
2018	425
2019	106
Total	$	2,832

Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

The following table summarizes our future principal contractual obligations as of December 31, 2014 (in thousands):



	Total		2015		2016		2017		2018		2019		Thereafter
Operating lease commitments	$	42,624	$	11,535	$	9,265	$	7,368	$	6,732	$	4,726	$	2,998
Less: Sublease rental income	431		431		—		—		—		—		—
Operating lease commitments—net	42,193		11,104		9,265		7,368		6,732		4,726		2,998
Inventory purchase commitments	62,804		62,804		—		—		—		—		—
Other contractual commitments	21,006		18,169		1,861		976		—		—		—
Total	$	126,003	$	92,077	$	11,126	$	8,344	$	6,732	$	4,726	$	2,998

Operating Leases—We lease certain facilities under various non-cancelable operating leases, which expire through 2024. Certain leases require us to pay variable costs such as taxes, maintenance, and insurance. The terms of certain operating leases also provide for renewal options and escalation clauses. Rent expense was $10.6 million, $9.8 million and $8.7 million for fiscal 2014, fiscal 2013, and fiscal 2012, respectively. Rent expense is recognized using the straight-line method over the term of the lease.

Contract Manufacturer and Other Commitments—Our independent contract manufacturers procure components and build our products based on our forecasts. These forecasts are based on estimates of future demand for our products, which are in turn based on historical trends and an analysis from our sales and marketing organizations, adjusted for overall market conditions. In order to reduce manufacturing lead times and plan for adequate component supply, we may issue purchase orders to some of our independent contract manufacturers which may not be cancelable. As of December 31, 2014, we had $62.8 million of open purchase orders with our independent contract manufacturers that may not be cancelable.

In addition to commitments with contract manufacturers, we have open purchase orders and contractual obligations in the ordinary course of business for which we have not received goods or services. As of December 31, 2014, we had $21.0 million in other contractual commitments.

Litigation—We are involved in disputes, litigation, and other legal actions. For lawsuits where we are the defendant, we are in the process of defending these litigation matters, and while there can be no assurances and the outcome of these matters is currently not determinable, we currently believe that there are no existing claims or proceedings that are likely to have a material adverse effect on our financial position. There are many uncertainties associated with any litigation and these actions or other third-party claims against us may cause us to incur costly litigation or substantial settlement charges. In addition, the resolution of any intellectual property litigation may require us to make royalty payments, which could adversely affect our gross margins in future periods. If any of those events were to occur, our business, financial condition, results of operations, and cash flows could be adversely affected. The actual liability in any such matters may be materially different from our estimates, if any, which could result in the need to adjust the liability and record additional expenses. We have not recorded any significant accrual for loss contingencies associated with such legal proceedings; determined that an unfavorable outcome is probable or reasonably possible; or determined that the amount or range of any possible loss is reasonably estimable.

Indemnification—Under the indemnification provisions of our standard sales contracts, we agree to defend our customers against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. Our exposure under these indemnification provisions is generally limited by the terms of our contracts to the total amount paid by our customer under the agreement. However, certain agreements include indemnification provisions beyond indemnification for third-party claims of intellectual property infringement and that could potentially expose us to losses in excess of the amount received under the agreement and in some instances to potential liability that is not contractually limited. To date, there have been no awards under such indemnification provisions.

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Schedule of Fair Value of Assets Acquired and Liabilities Assumed [Table Text Block]

The following table summarizes the fair value of assets acquired and liabilities assumed (in thousands):



Cash and cash equivalents	$	206
Other current assets	501
Finite-lived intangible assets	2,800
Indefinite-lived intangible assets	2,600
Goodwill	2,824
Other assets	88
Total assets acquired	9,019
Current liabilities	1,030
Long-term liabilities	2,004
Total liabilities assumed	3,034
Total purchase price	$	5,985

Related Party Transactions (Details) - Law Firm where Board Member's Son is a Partner [Member] - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Expenses for legal services	$ 1,700,000	$ 100,000	$ 0
Amounts due and payable to the law firm	$ 1,300,000	$ 300,000

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Basis of Presentation and Preparation

Use of Estimates

Certain Significant Risks and Uncertainties

Concentration of Credit Risk

Financial Instruments and Fair Value

Comprehensive Income

Foreign Currency Translation and Transaction Gains and Losses

Cash, Cash Equivalents and Available-for-sale Investments

Other Investments

Inventory

Property and Equipment



	Estimated Useful Lives
Building and building improvements	20 years
Evaluation units	1 year
Computer equipment and software	1 - 2 years
Furniture and fixtures	3 - 5 years
Leasehold improvements	Shorter of useful life or lease term

Impairment of Long-Lived Assets

Goodwill

Other Intangible Assets

Deferred Revenue and Revenue Recognition

Revenue is recognized when all of the following criteria have been met:


•	Persuasive evidence of an arrangement exists. Binding contracts or purchase orders are generally used to determine the existence of an arrangement.


•	Delivery has occurred or services have been rendered. Delivery occurs when we fulfill an order and title and risk of loss has been transferred. Services revenue is deferred and recognized ratably over the contract service period, which is typically from one to three years and is generally recognized upon delivery or completion of service.


•	Sales price is fixed or determinable. We assess whether the sales price is fixed or determinable based on the payment terms associated with the transaction and when the sales price is deemed final.


•	Collectability is reasonably assured. We assess collectability based primarily on creditworthiness as determined by credit checks, analysis, and payment history.

Income Taxes

Stock-Based Compensation Expense

Advertising Expense

Research and Development Costs

Research and Development Costs—Research and development costs are expensed as incurred.

Software Development Costs

Accounts Receivable

Warranties

Foreign Currency Derivatives

Reclassification

Recent Accounting Pronouncement

Financial Instruments and Fair Value , Additional Information (Details) - Coyote Point Systems, Inc. [Member] $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of long-lived assets	$ 2.4
Fair value of other intangible assets	$ 2.0

Summary of Significant Accounting Policies , Goodwill (Details)	12 Months Ended
	Dec. 31, 2014 reporting_unit
Accounting Policies [Abstract]
Number of reporting units	1

Segment Information (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Revenue and property and equipment by geographic region [Table Text Block]

The following tables set forth revenue and property and equipment by geographic region (in thousands):



	Year Ended December 31,
Revenue	2014		2013		2012
Americas:
United States	$	200,294	$	162,327	$	145,369
Other Americas	124,365		90,459		71,687
Total Americas	324,659		252,786		217,056
Europe, Middle East, and Africa (“EMEA”)	270,537		208,979		184,175
Asia Pacific and Japan (“APAC”)	175,168		153,532		132,408
Total revenue	$	770,364	$	615,297	$	533,639




Property and Equipment—net	December 31, 2014		December 31, 2013
Americas:
United States	$	46,116	$	29,334
Canada	6,054		4,372
Other Americas	875		45
Total Americas	53,045		33,751
EMEA	3,256		1,273
APAC	2,618		1,628
Total property and equipment—net	$	58,919	$	36,652

Financial Instruments and Fair Value , Change to Contingent Consideration Liability (Details) - Estimate of Fair Value [Member] - Recurring [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Movement in Contingent Consideration Liability [Roll Forward]
Contingent consideration liability, beginning	$ 1,850
Less change in fair value of contingent consideration	(1,850)
Contingent consideration liability, ending	$ 0

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

Accrued warranty activities are summarized as follows (in thousands):



	Year Ended December 31,
	2014			2013			2012
Accrued warranty balance—beginning of the period	$	3,037		$	2,309		$	2,582
Warranty costs incurred	(3,653		)	(3,444		)	(2,669		)
Provision for warranty for the year, including warranty liabilities assumed in connection with an acquisition	5,209			3,965			2,639
Adjustment related to pre-existing warranties	(324		)	207			(243		)
Accrued warranty balance—end of the period	$	4,269		$	3,037		$	2,309

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The notional amount of forward exchange contracts to hedge balance sheet accounts as of December 31, 2014 and 2013 were (in thousands):



	Buy/Sell	Notional
Balance Sheet Contracts:
Currency—As of December 31, 2014
CAD	Buy	$	6,879

Currency—As of December 31, 2013
CAD	Buy	$	21,867

Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
Schedule II (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 32	$ 115	$ 336
Charged to costs and expenses	330	(83)	(221)
Ending balance	362	32	115
Sales Returns Reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	4,573	2,267	2,351
Charged to costs and expenses	1,269	2,306	(84)
Ending balance	$ 5,842	$ 4,573	$ 2,267

Financial Instruments and Fair Value , Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 709,030	$ 726,001
Unrealized Gains	384	1,565
Unrealized Losses	(924)	(394)
Fair Value	708,490	727,172
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	356,625	205,428
Less Than 12 Months, Unrealized Losses	(907)	(394)
12 Months or Greater, Fair Value	6,011	500
12 Months or Greater, Unrealized Losses	(17)	0
Total, Fair Value	362,636	205,928
Total, Unrealized Losses	(924)	(394)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Due within one year	436,766	375,497
Due within one to three years	271,724	351,675
Fair Value	708,490	727,172
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,749	2,000
Unrealized Gains	1	1
Unrealized Losses	(6)	0
Fair Value	5,744	2,001
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	4,745
Less Than 12 Months, Unrealized Losses	(6)
12 Months or Greater, Fair Value	0
12 Months or Greater, Unrealized Losses	0
Total, Fair Value	4,745
Total, Unrealized Losses	(6)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fair Value	5,744	2,001
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	589,526	603,185
Unrealized Gains	365	1,506
Unrealized Losses	(875)	(374)
Fair Value	589,016	604,317
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	317,011	182,795
Less Than 12 Months, Unrealized Losses	(858)	(374)
12 Months or Greater, Fair Value	6,011	500
12 Months or Greater, Unrealized Losses	(17)	0
Total, Fair Value	323,022	183,295
Total, Unrealized Losses	(875)	(374)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fair Value	589,016	604,317
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	51,156	69,356
Unrealized Gains	3	7
Unrealized Losses	(4)	0
Fair Value	51,155	69,363
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	8,185	7,897
Less Than 12 Months, Unrealized Losses	(4)	0
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	8,185	7,897
Total, Unrealized Losses	(4)	0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fair Value	51,155	69,363
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39,745	38,815
Unrealized Gains	15	48
Unrealized Losses	(39)	(20)
Fair Value	39,721	38,843
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	26,684	14,736
Less Than 12 Months, Unrealized Losses	(39)	(20)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	26,684	14,736
Total, Unrealized Losses	(39)	(20)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fair Value	39,721	38,843
Certificates of deposit and term deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,854	12,645
Unrealized Gains	0	3
Unrealized Losses	0	0
Fair Value	22,854	12,648
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fair Value	$ 22,854	$ 12,648

Accumulated Other Comprehensive (Loss) Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OTHER EXPENSE—Net	$ (3,168)	$ (1,455)	$ (485)
Provision for income taxes	(36,206)	(31,668)	(38,160)
Net income	25,343	44,273	$ 66,836
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	5	5
Net income	(342)	(9)
Foreign currency translation losses [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OTHER EXPENSE—Net	(333)
Unrealized gains on investments [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OTHER EXPENSE—Net	$ (14)	$ (14)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Property and Equipment—Net (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Property and equipment—net consisted of the following (in thousands):



	December 31, 2014			December 31, 2013
Land	$	13,895		$	13,895
Building and building improvements	20,166			610
Evaluation units	31,474			23,442
Computer equipment and software	31,821			22,442
Furniture and fixtures	5,096			1,697
Construction-in-progress	3,902			10,947
Leasehold improvements	7,998			5,417
Total property and equipment	114,352			78,450
Less: accumulated depreciation	(55,433		)	(41,798		)
Property and equipment—net	$	58,919		$	36,652

Commitments and Contingencies Minimum Operating Lease Payments (Details) $ in Thousands	Dec. 31, 2014 USD ($)
Operating Lease Commitments:
Operating lease commitments, 2015	$ 11,535
Operating lease commitments, 2016	9,265
Operating lease commitments, 2017	7,368
Operating lease commitments, 2018	6,732
Operating lease commitments, 2019	4,726
Operating lease commitments, Thereafter	2,998
Operating lease commitments	42,624
Sublease Commitments:
Sublease rental income, 2015	431
Sublease rental income, 2016	0
Sublease rental income, 2017	0
Sublease rental income, 2018	0
Sublease rental income, 2019	0
Sublease rental income, Thereafter	0
Sublease rental income	431
Operating commitments, net:
Operating commitments, net, 2015	11,104
Operating commitments, net, 2016	9,265
Operating commitments, net, 2017	7,368
Operating commitments, net, 2018	6,732
Operating commitments, net, 2019	4,726
Operating commitments, net, Thereafter	2,998
Operating commitments, net	42,193
Purchase commitments:
Purchase commitments, 2015	62,804
Purchase commitments, 2016	0
Purchase commitments, 2017	0
Purchase commitments, 2018	0
Purchase commitments, 2019	0
Purchase commitments, Thereafter	0
Purchase commitments	62,804
Other contract commitments:
Other contract commitments, 2015	18,169
Other contract commitments, 2016	1,861
Other contract commitments, 2017	976
Other contract commitments, 2018	0
Other contract commitments, 2019	0
Other contract commitments, Thereafter	0
Other contract commitments	21,006
Contractual Obligation	126,003
Contractual Obligation,2015	92,077
Contractual Obligation, 2016	11,126
Contractual Obligation, 2017	8,344
Contractual Obligation, 2018	6,732
Contractual Obligation, 2019	4,726
Contractual Obligation, Thereafter	$ 2,998

Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2014

Deferred Revenue Disclosure [Abstract]

Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

Deferred revenue consisted of the following (in thousands):



	December 31, 2014		December 31, 2013
Product	$	4,642	$	2,915
Services and other	554,115		429,713
Total deferred revenue	$	558,757	$	432,628
Reported As:
Current	$	368,929	$	293,664
Non-current	189,828		138,964
Total deferred revenue	$	558,757	$	432,628

Financial Instruments and Fair Value (Tables)

12 Months Ended

Dec. 31, 2014

Financial Instruments and Fair Value [Abstract]

Summary of Investments [Table Text Block]

The following table summarizes our investments (in thousands):



	December 31, 2014
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Corporate debt securities	$	589,526	$	365	$	(875	)	$	589,016
Commercial paper	51,156		3		(4		)	51,155
Municipal bonds	39,745		15		(39		)	39,721
Certificates of deposit and term deposits ⁽¹⁾	22,854		—		—			22,854
U.S. government and agency securities	5,749		1		(6		)	5,744
Total available-for-sale securities	$	709,030	$	384	$	(924	)	$	708,490

	December 31, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Corporate debt securities	$	603,185	$	1,506	$	(374	)	$	604,317
Commercial paper	69,356		7		—			69,363
Municipal bonds	38,815		48		(20		)	38,843
Certificates of deposit and term deposits ⁽¹⁾	12,645		3		—			12,648
U.S. government and agency securities	2,000		1		—			2,001
Total available-for-sale securities	$	726,001	$	1,565	$	(394	)	$	727,172

⁽¹⁾ The majority of our certificates of deposit and term deposits are foreign deposits.

Schedule of Unrealized Loss on Investments [Table Text Block]

The following table shows the gross unrealized losses and the related fair values of our investments that have been in a continuous unrealized loss position (in thousands):



	December 31, 2014
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	317,011	$	(858	)	$	6,011	$	(17	)	$	323,022	$	(875	)
Commercial paper	8,185		(4		)	—		—			8,185		(4		)
Municipal bonds	26,684		(39		)	—		—			26,684		(39		)
U.S. government and agency securities	4,745		(6		)	—		—			4,745		(6		)
Total available-for-sale securities	$	356,625	$	(907	)	$	6,011	$	(17	)	$	362,636	$	(924	)

The following table shows the gross unrealized losses and the related fair values of our investments that have been in a continuous unrealized loss position (in thousands):



	December 31, 2013
	Less Than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate debt securities	$	182,795	$	(374	)	$	500	$	—	$	183,295	$	(374	)
Commercial paper	7,897		—			—		—		7,897		—
Municipal bonds	14,736		(20		)	—		—		14,736		(20		)
Total available-for-sale securities	$	205,428	$	(394	)	$	500	$	—	$	205,928	$	(394	)

Investments Classified by Contractual Maturity Date [Table Text Block]

The contractual maturities of our investments are as follows (in thousands):



	December 31, 2014		December 31, 2013
Due within one year	$	436,766	$	375,497
Due within one to three years	271,724		351,675
Total	$	708,490	$	727,172

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 and December 31, 2013 (in thousands):



	December 31, 2014								December 31, 2013
	Aggregate Fair Value		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs		Aggregate Fair Value		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
			(Level 1)		(Level 2)		(Level 3)				(Level 1)		(Level 2)		(Level 3)
Assets:
Corporate debt securities	$	589,016	$	—	$	589,016	$	—	$	604,317	$	—	$	604,317	$	—
Commercial paper	51,155		—		51,155		—		71,363		—		71,363		—
Municipal bonds	39,721		—		39,721		—		38,843		—		38,843		—
Certificates of deposit and term deposits	22,854		—		22,854		—		12,648		—		12,648		—
Money market funds	13,311		13,311		—		—		5,724		5,724		—		—
U.S. government and agency securities	5,744		1,998		3,746		—		2,001		—		2,001		—
Total	$	721,801	$	15,309	$	706,492	$	—	$	734,896	$	5,724	$	729,172	$	—

Liabilities:
Contingent consideration	$	—	$	—	$	—	$	—	$	1,850	$	—	$	—	$	1,850
Total	$	—	$	—	$	—	$	—	$	1,850	$	—	$	—	$	1,850

Reported as:
Cash equivalents	$	13,311							$	7,724
Short-term investments	436,766								375,497
Long-term investments	271,724								351,675
Total	$	721,801							$	734,896

Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]

The change in the fair value of our contingent consideration liability was as follows (in thousands):



As of December 31, 2013	$1,850
Less change in fair value of contingent consideration	(1,850)
As of December 31, 2014	$—

Accumulated Other Comprehensive (Loss) Income

12 Months Ended

Dec. 31, 2014

Other Comprehensive Income (Loss), Net of Tax [Abstract]

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

The following table summarizes the changes in accumulated balances of other comprehensive income for fiscal 2014 and fiscal 2013 (in thousands):



	December 31, 2014
	Foreign Currency Translation Gains and Losses			Unrealized Gains and Losses on Investments			Tax benefit or provision related to items of other comprehensive income or loss			Total
Beginning balance	$	333		$	1,168		$	(409	)	$	1,092
Other comprehensive loss before reclassifications				(1,694		)	595			(1,099		)
Amounts reclassified from accumulated other comprehensive (loss) income	(333		)	(14		)	5			(342		)
Net current-period other comprehensive loss	(333		)	(1,708		)	600			(1,441		)
Ending balance	$	—		$	(540	)	$	191		$	(349	)



	December 31, 2013
	Foreign Currency Translation Gains and Losses			Unrealized Gains and Losses on Investments			Tax benefit or provision related to items of other comprehensive income or loss			Total
Beginning balance	$	1,950		$	1,755		$	(614	)	$	3,091
Other comprehensive loss before reclassifications	(1,617		)	(573		)	200			(1,990		)
Amounts reclassified from accumulated other comprehensive (loss) income	—			(14		)	5			(9		)
Net current-period other comprehensive loss	(1,617		)	(587		)	205			(1,999		)
Ending balance	$	333		$	1,168		$	(409	)	$	1,092

The following table provides details about the reclassification out of accumulated other comprehensive (loss) income for fiscal 2014 and fiscal 2013 (in thousands):



December 31, 2014
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement Where Net Income is Presented
Foreign currency translation losses	$	(333	)	Other expense—net
Unrealized gains on investments	$	(14	)	Other expense—net
Tax provision related to items of other comprehensive income or loss	5			Provision for income taxes
Total reclassification for the period	$	(342	)



December 31, 2013
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement Where Net Income is Presented
Unrealized gains on investments	$	(14	)	Other expense—net
Tax provision related to items of other comprehensive income or loss	5			Provision for income taxes
Total reclassification for the period	$	(9	)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e716-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Schedule II

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS



	Year Ended December 31,
	2014		2013			2012
	(in thousands)
Sales Returns Reserve:
Beginning balance	$	4,573	$	2,267		$	2,351
Charged (credited) to costs and expenses, net of deductions	1,269		2,306			(84		)
Ending balance	$	5,842	$	4,573		$	2,267

Allowance for Doubtful Accounts:
Beginning balance	$	32	$	115		$	336
Charged (credited) to costs and expenses, net of write-offs	330		(83		)	(221		)
Ending balance	$	362	$	32		$	115

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]
Balance, shares at Dec. 31, 2011		156,401	(1,409)
Balance at Dec. 31, 2011	$ 358,354	$ 156	$ (2,995)	$ 317,026	$ 402	$ 43,765
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		4,779
Issuance of common stock upon exercise of stock options	27,183	$ 5		27,178
Issuance of common stock in connection with employee stock purchase plan (in shares)		577
Issuance of common stock in connection with employee stock purchase plan	10,904	$ 1		10,903
Stock-based compensation expense	30,690			30,690
Income tax benefit associated with stock-based compensation	14,278			14,278
Net unrealized gain (loss) on investments - net of taxes	2,165				2,165
Net change in cumulative translation adjustments	524				524
Net income	66,836					66,836
Balance, shares at Dec. 31, 2012		161,757	(1,409)
Balance at Dec. 31, 2012	510,934	$ 162	$ (2,995)	400,075	3,091	110,601
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		2,488
Issuance of common stock upon exercise of stock options	12,888	$ 2		12,886
Issuance of common stock in connection with employee stock purchase plan (in shares)		672
Issuance of common stock in connection with employee stock purchase plan	12,696	$ 1		12,695
Issuance of common stock upon vesting of restricted stock units (in shares)		228
Tax withholding upon vesting of restricted stock awards (in shares)		(70)
Tax withholding upon vesting of restricted stock awards	(1,452)			(1,452)
Repurchase and retirement of common stock (in shares)		(3,540)	1,409
Repurchase and retirement of common stock	(38,949)	$ (4)	$ 2,995	(8,929)		(33,011)
Stock-based compensation expense	43,909			43,909
Income tax benefit associated with stock-based compensation	3,460			3,460
Net unrealized gain (loss) on investments - net of taxes	(382)				(382)
Net change in cumulative translation adjustments	(1,617)				(1,617)
Net income	44,273					44,273
Balance, shares at Dec. 31, 2013		161,535	0
Balance at Dec. 31, 2013	585,760	$ 161	$ 0	462,644	1,092	121,863
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		4,763
Issuance of common stock upon exercise of stock options	42,431	$ 5		42,426
Issuance of common stock in connection with employee stock purchase plan (in shares)		770
Issuance of common stock in connection with employee stock purchase plan	13,991	$ 1		13,990
Issuance of common stock upon vesting of restricted stock units (in shares)		1,483
Issuance of common stock upon vesting of restricted stock units		$ 1		(1)
Tax withholding upon vesting of restricted stock awards (in shares)		(461)
Tax withholding upon vesting of restricted stock awards	(10,598)			(10,598)
Repurchase and retirement of common stock (in shares)		(1,647)
Repurchase and retirement of common stock	(38,557)	$ (2)		(4,994)		(33,561)
Stock-based compensation expense	58,994			58,994
Income tax benefit associated with stock-based compensation	43			43
Net unrealized gain (loss) on investments - net of taxes	(1,108)				(1,108)
Net change in cumulative translation adjustments	(333)				(333)
Net income	25,343					25,343
Balance, shares at Dec. 31, 2014		166,443	0
Balance at Dec. 31, 2014	$ 675,966	$ 166	$ 0	$ 562,504	$ (349)	$ 113,645

Stockholders' Equity , Allocation of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 58,994	$ 44,471	$ 30,690
Income tax benefit from employee stock option plans	11,086	8,331	5,870
Cost of product revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	483	383	333
Cost of services and other revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	5,826	4,841	3,736
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	17,264	13,271	9,226
Selling and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	26,744	19,526	12,793
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	8,677	6,450	4,602
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	17,555	20,806	24,506
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	37,068	18,968	1,714
ESPP [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 4,371	$ 4,697	$ 4,470

Consolidated Balance Sheets Parenthetical - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Sales returns reserve and allowance for doubtful accounts	$ 6,204	$ 4,605
Common Stock, par value (dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized	300,000	300,000
Common Stock, shares issued	166,443	161,535
Common Stock, shares outstanding	166,443	161,535

Income Taxes

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

INCOME TAXES

Income before income taxes consisted of the following (in thousands):



	Year Ended December 31,
	2014		2013			2012
Domestic	$	35,778	$	83,076		$	95,730
Foreign	25,771		(7,135		)	9,266
Total income before income taxes	$	61,549	$	75,941		$	104,996

The provision for income taxes consisted of the following (in thousands):



	Year Ended December 31,
	2014			2013			2012
Current:
Federal	$	17,717		$	43,384		$	43,765
State	1,110			2,490			1,992
Foreign	8,921			4,175			2,266
Total current	$	27,748		$	50,049		$	48,023
Deferred:
Federal	$	6,742		$	(17,149	)	$	(9,677	)
State	(36		)	(1,232		)	(186		)
Foreign	1,752			—			—
Total deferred	8,458			(18,381		)	(9,863		)
Provision for income taxes	$	36,206		$	31,668		$	38,160

The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate as follows (in thousands):



	Year Ended December 31,
	2014			2013			2012
Tax at federal statutory tax rate	$	21,542		$	26,579		$	36,749
Stock-based compensation expense	7,367			4,571			1,570
State taxes—net of federal benefit	975			419			1,186
Domestic production activities deduction	—			(3,256		)	(1,813		)
Foreign tax credit	(4,433		)	(2,853		)	(2,348		)
Research and development credit	(880		)	(1,650		)	(144		)
Foreign income taxed at different rates	(406		)	2,927			(1,626		)
Foreign withholding taxes	9,085			6,622			2,185
Other	2,956			(1,691		)	2,401
Total provision for income taxes	$	36,206		$	31,668		$	38,160

Significant permanent differences arise from the portion of stock-based compensation expense that is not expected to generate a tax deduction, such as stock-based compensation expense on stock option grants to certain foreign employees, offset by the actual tax benefits in the current periods from disqualifying dispositions of shares held by our U.S. employees. For stock options exercised by our U.S. employees, we receive an income tax benefit calculated as the difference between the fair market value of the stock issued at the time of the exercise and the option price, tax effected. For fiscal 2014, income tax payable was not reduced by excess tax benefits from the exercise or vesting of stock-based awards, therefore we did not recognize a significant benefit in additional paid-in-capital. The income tax benefits for fiscal 2013 and fiscal 2012 associated with dispositions from employee stock transactions of $3.5 million, and $14.3 million, respectively, were recognized as additional paid-in capital because it reduced income taxes payable.

As of December 31, 2014, we did not recognize federal and California deferred tax assets related to stock-based compensation excess tax benefits of $6.5 million and $3.3 million, respectively. Unrecognized excess tax benefits will be accounted for as a credit to additional paid-in capital when realized through a reduction in income taxes payable.

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets as of the years ended are presented below (in thousands):



	December 31, 2014		December 31, 2013
Deferred tax assets:
Net operating loss carryforward	$	1,293	$	2,183
Deferred revenue	31,545		47,341
Nondeductible reserves and accruals	20,904		16,055
Depreciation and amortization	193		(465		)
General business credit carryforward	2,155		439
Stock-based compensation expense	16,463		15,468
Other	11		17
Total deferred tax assets	$	72,564	$	81,038

In assessing the realizability of deferred tax assets, we considered whether it is more likely than not that some portion or all of our deferred tax assets will be realized. This realization is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. We concluded that it is more likely than not that we would be able to realize the benefits of our deferred tax assets in the future.

As of December 31, 2014, we had $22.9 million in federal net operating loss carryforwards to offset future income that will not expire until 2034. We also had federal tax credits of $5.5 million available to carryback and claim federal tax refunds from prior year. As of December 31, 2014, we had $6.9 million in California net operating loss carryforwards to offset future income that will not expire until 2030. We also had state tax credit carryforwards of $5.2 million available to offset our future state taxes. The state credits carry forward indefinitely.

Our policy with respect to undistributed foreign subsidiaries’ earnings is to consider those earnings to be indefinitely reinvested and, accordingly, no related provision of U.S. federal and state income taxes has been provided on such earnings. Upon distribution of those earnings in the form of dividends or otherwise, we would be subject to both U.S. income taxes (subject to an adjustment for foreign tax credits) and withholding taxes in the various foreign countries. As of December 31, 2014, we have not recorded U.S. income tax on $21.3 million of foreign earnings that are deemed to be permanently reinvested overseas.

We operate under a tax incentive agreement in Singapore, which is effective through December 31, 2023, and may be extended if certain additional requirements are satisfied. The tax incentive agreement is conditional upon our meeting certain employment and investment thresholds. We did not realize any tax savings from the Singapore tax incentives in fiscal 2014 because of net tax losses generated in fiscal 2013 for that jurisdiction.

As of December 31, 2014, we had $44.2 million of unrecognized tax benefits, of which, if recognized, $43.4 million would favorably affect our effective tax rate. Our policy is to include accrued interest and penalties related to uncertain tax benefits in income tax expense. As of December 31, 2014, 2013 and 2012, accrued interest and penalties were $1.7 million, $1.0 million, and $1.5 million, respectively.

The aggregate changes in the balance of unrecognized tax benefits are as follows (in thousands):



	Year Ended December 31,
	2014		2013			2012
Unrecognized tax benefits, beginning of year	$	29,604	$	27,808		$	19,269
Gross increases for tax positions related to the current year	14,547		4,713			7,550
Gross increases for tax positions related to the prior year	—		405			1,479
Gross decreases for tax positions related to the prior year	—		(3,322		)	(490		)
Unrecognized tax benefits, end of year	$	44,151	$	29,604		$	27,808

As of December 31, 2014, 2013 and 2012, $45.1 million, $30.2 million, and $28.8 million, respectively, of the amounts reflected above were recorded as Income taxes payable—non-current in our consolidated balance sheet.

As of December 31, 2014, there was no unrecognized tax benefits that we expect would change significantly over the next 12 months.

We file income tax returns in the U.S. federal jurisdiction, and various U.S. state and foreign jurisdictions. The statute of limitations is open for years that generated state net operating loss carryforwards and after 2009 for state jurisdictions. Additionally, we have foreign net operating losses that have an indefinite life. Generally, we are no longer subject to non-U.S. income tax examinations by tax authorities for tax years prior to 2008. We are no longer subject to examination by U.S federal income tax authorities for tax years prior to 2010.

Net Income Per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period. Diluted net income per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding, plus the dilutive effects of stock options, RSUs, and ESPP. Dilutive shares of common stock are determined by applying the treasury stock method.

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):



	Year Ended December 31,
	2014		2013		2012
Numerator:
Net income	$	25,343	$	44,273	$	66,836

Denominator:
Basic shares:
Weighted-average common stock outstanding-basic	163,831		162,435		158,074
Diluted shares:
Weighted-average common stock outstanding-basic	163,831		162,435		158,074
Effect of potentially dilutive securities:
Stock options	4,583		5,685		8,214
RSUs	844		35		—
ESPP	31		28		41
Weighted-average shares used to compute diluted net income per share	169,289		168,183		166,329
Net income per share:
Basic	$	0.15	$	0.27	$	0.42
Diluted	$	0.15	$	0.26	$	0.40



	Year Ended December 31,
	2014	2013	2012
Stock options	3,469	7,397	7,183
RSUs	768	2,774	291
ESPP	99	419	321
	4,336	10,590	7,795

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 283,254	$ 115,873
Short-term investments	436,766	375,497
Accounts receivable—Net of sales returns reserve and allowance for doubtful accounts of $6,204 and $4,605 as of December 31, 2014 and December 31 2013, respectively	184,741	130,471
Inventory	69,477	48,672
Deferred tax assets	41,484	50,980
Prepaid expenses and other current assets	31,143	14,053
Total current assets	1,046,865	735,546
LONG-TERM INVESTMENTS	271,724	351,675
PROPERTY AND EQUIPMENT—Net	58,919	36,652
DEFERRED TAX ASSETS	31,080	30,058
GOODWILL	2,824	2,872
OTHER INTANGIBLE ASSETS—Net	2,832	6,841
OTHER ASSETS	10,530	4,820
TOTAL ASSETS	1,424,774	1,168,464
CURRENT LIABILITIES:
Accounts payable	49,947	35,599
Accrued liabilities	29,016	27,380
Accrued payroll and compensation	45,875	34,997
Income taxes payable	2,689	21,421
Deferred revenue	368,929	293,664
Total current liabilities	496,456	413,061
DEFERRED REVENUE	189,828	138,964
INCOME TAXES PAYABLE	45,139	30,208
OTHER LIABILITIES	17,385	471
Total liabilities	748,808	582,704
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS’ EQUITY:
Common stock, $0.001 par value — 300,000 shares authorized; 166,443 and 161,535 shares issued and outstanding as of December 31, 2014 and December 31, 2013, respectively	166	161
Additional paid-in capital	562,504	462,644
Accumulated other comprehensive (loss) income	(349)	1,092
Retained earnings	113,645	121,863
Total stockholders’ equity	675,966	585,760
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,424,774	$ 1,168,464

Income Taxes , Reconciliation of Pre-Tax Income(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Domestic	$ 35,778	$ 83,076	$ 95,730
Foreign	25,771	(7,135)	9,266
INCOME BEFORE INCOME TAXES	$ 61,549	$ 75,941	$ 104,996

Financial Instruments and Fair Value , Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Estimate of Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets, Fair Value Disclosure	$ 721,801	$ 734,896
Contingent consideration	0	1,850
Financial Liabilities Fair Value Disclosure	0	1,850
Estimate of Fair Value [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets, Fair Value Disclosure	15,309	5,724
Estimate of Fair Value [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets, Fair Value Disclosure	706,492	729,172
Estimate of Fair Value [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	0	1,850
Financial Liabilities Fair Value Disclosure	0	1,850
Estimate of Fair Value [Member] \| U.S. government and agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	5,744	2,001
Estimate of Fair Value [Member] \| U.S. government and agency securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	1,998	0
Estimate of Fair Value [Member] \| U.S. government and agency securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	3,746	2,001
Estimate of Fair Value [Member] \| Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	589,016	604,317
Estimate of Fair Value [Member] \| Corporate debt securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	0	0
Estimate of Fair Value [Member] \| Corporate debt securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	589,016	604,317
Estimate of Fair Value [Member] \| Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	51,155	71,363
Estimate of Fair Value [Member] \| Commercial paper [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	0	0
Estimate of Fair Value [Member] \| Commercial paper [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	51,155	71,363
Estimate of Fair Value [Member] \| Municipal bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	39,721	38,843
Estimate of Fair Value [Member] \| Municipal bonds [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	0	0
Estimate of Fair Value [Member] \| Municipal bonds [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	39,721	38,843
Estimate of Fair Value [Member] \| Certificates of deposit and term deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	22,854	12,648
Estimate of Fair Value [Member] \| Certificates of deposit and term deposits [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	0	0
Estimate of Fair Value [Member] \| Certificates of deposit and term deposits [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	22,854	12,648
Estimate of Fair Value [Member] \| Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	13,311	5,724
Estimate of Fair Value [Member] \| Money market funds [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	13,311	5,724
Estimate of Fair Value [Member] \| Money market funds [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	0	0
Reported as [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets, Fair Value Disclosure	721,801	734,896
Reported as [Member] \| Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	13,311	7,724
Reported as [Member] \| Short-term investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	436,766	375,497
Reported as [Member] \| Long-term investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value Disclosure	$ 271,724	$ 351,675

Business Combinations (2013 Acquisitions) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 21, 2013	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Sep. 13, 2013
Business Acquisition [Line Items]
Goodwill				$ 2,824	$ 2,872
Coyote Point Systems, Inc. [Member]
Business Acquisition [Line Items]
Cash paid to acquire business	$ 6,000
Contingent consideration	5,500
Amount of contingent liability reversed in 2014				1,900
Cash and cash equivalents	206
Other current assets	501
Finite-lived intangible assets	2,800
Indefinite-lived intangible assets	2,600
Goodwill	2,824
Other assets	88
Total assets acquired	9,019
Current liabilities	1,030
Long-term liabilities	2,004
Total liabilities assumed	3,034
Total purchase price	5,985
Impairment of long-lived assets				2,400
Xtera Communications, Inc. [Member]
Business Acquisition [Line Items]
Cash paid to acquire business		$ 1,700
Contingent consideration						$ 100
Finite-lived intangible assets		1,500	$ 1,500
Total consideration		1,800
Purchased tangible assets						$ 200
Estimated contingent obligation		$ 100	$ 100
Developed Technology [Member] \| Coyote Point Systems, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 2,300
Useful life of finite-lived intangible assets	6 years
Finite-Lived Intangible Asset, Estimated Remaining Useful Life			5 years
Customer Relationships [Member] \| Coyote Point Systems, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 500
Useful life of finite-lived intangible assets	6 years
Cost of Sales [Member] \| Coyote Point Systems, Inc. [Member]
Business Acquisition [Line Items]
Impairment of long-lived assets				$ 2,400
In Process Research and Development [Member] \| Coyote Point Systems, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 2,600

Segment Information (Details) $ in Thousands	12 Months Ended
Segment Information (Details) $ in Thousands	Dec. 31, 2014 USD ($) Segment_Managers reportable_segment business_activity operating_segment	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Segment Reporting Information [Line Items]
Business activity (in business activities) \| business_activity	1
Segment managers responsible for operations (in segment managers) \| Segment_Managers	0
Number of operating segments (in operating segments) \| operating_segment	1
Number of reportable segments (in reportable segments) \| reportable_segment	1
Revenue	$ 770,364	$ 615,297	$ 533,639
Property and equipment - net	58,919	36,652
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	324,659	252,786	217,056
Property and equipment - net	53,045	33,751
United States
Segment Reporting Information [Line Items]
Revenue	200,294	162,327	145,369
Property and equipment - net	46,116	29,334
Canada [Member]
Segment Reporting Information [Line Items]
Property and equipment - net	6,054	4,372
Other Americas [Member]
Segment Reporting Information [Line Items]
Revenue	124,365	90,459	71,687
Property and equipment - net	875	45
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	270,537	208,979	184,175
Property and equipment - net	3,256	1,273
APAC [Member]
Segment Reporting Information [Line Items]
Revenue	175,168	153,532	$ 132,408
Property and equipment - net	$ 2,618	$ 1,628

Summary of Significant Accounting Policies , Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Reserve for sales returns	$ 5.8	$ 4.6
Allowance for doubtful accounts	$ 0.4

Investments in Privately-Held Companies	12 Months Ended
Investments in Privately-Held Companies	Dec. 31, 2014
Investments, All Other Investments [Abstract]
INVESTMENTS IN PRIVATELY-HELD COMPANIES	INVESTMENTS IN PRIVATELY-HELD COMPANIES In fiscal 2014, we invested a total of $4.4 million in the equity securities of two privately-held companies. In fiscal 2013, we invested a total of $2.0 million in the equity securities of a privately-held company. Each of these investments are accounted for as cost-basis investments, as we own less than 20% of the voting securities and do not have the ability to exercise significant influence over operating and financial policies of the respective entities. These investments are carried at historical cost and are recorded as Other assets on our consolidated balance sheet and would be measured at fair value if indicators of impairment exist. As of December 31, 2014, no events have occurred that would adversely affect the carrying value of these investments.

Financial Instruments and Fair Value

12 Months Ended

Dec. 31, 2014

Financial Instruments and Fair Value [Abstract]

FINANCIAL INSTRUMENTS AND FAIR VALUE

The following table summarizes our investments (in thousands):



	December 31, 2014
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Corporate debt securities	$	589,526	$	365	$	(875	)	$	589,016
Commercial paper	51,156		3		(4		)	51,155
Municipal bonds	39,745		15		(39		)	39,721
Certificates of deposit and term deposits ⁽¹⁾	22,854		—		—			22,854
U.S. government and agency securities	5,749		1		(6		)	5,744
Total available-for-sale securities	$	709,030	$	384	$	(924	)	$	708,490

	December 31, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Corporate debt securities	$	603,185	$	1,506	$	(374	)	$	604,317
Commercial paper	69,356		7		—			69,363
Municipal bonds	38,815		48		(20		)	38,843
Certificates of deposit and term deposits ⁽¹⁾	12,645		3		—			12,648
U.S. government and agency securities	2,000		1		—			2,001
Total available-for-sale securities	$	726,001	$	1,565	$	(394	)	$	727,172

⁽¹⁾ The majority of our certificates of deposit and term deposits are foreign deposits.

The following table shows the gross unrealized losses and the related fair values of our investments that have been in a continuous unrealized loss position (in thousands):



	December 31, 2014
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	317,011	$	(858	)	$	6,011	$	(17	)	$	323,022	$	(875	)
Commercial paper	8,185		(4		)	—		—			8,185		(4		)
Municipal bonds	26,684		(39		)	—		—			26,684		(39		)
U.S. government and agency securities	4,745		(6		)	—		—			4,745		(6		)
Total available-for-sale securities	$	356,625	$	(907	)	$	6,011	$	(17	)	$	362,636	$	(924	)

The following table shows the gross unrealized losses and the related fair values of our investments that have been in a continuous unrealized loss position (in thousands):



	December 31, 2013
	Less Than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate debt securities	$	182,795	$	(374	)	$	500	$	—	$	183,295	$	(374	)
Commercial paper	7,897		—			—		—		7,897		—
Municipal bonds	14,736		(20		)	—		—		14,736		(20		)
Total available-for-sale securities	$	205,428	$	(394	)	$	500	$	—	$	205,928	$	(394	)

The contractual maturities of our investments are as follows (in thousands):



	December 31, 2014		December 31, 2013
Due within one year	$	436,766	$	375,497
Due within one to three years	271,724		351,675
Total	$	708,490	$	727,172

Available-for-sale securities are reported at fair value, with unrealized gains and losses, net of tax, included as a separate component of stockholders’ equity and in total comprehensive income. Realized gains and losses on available-for-sale securities are included in Other expense—net in our consolidated statements of operations.

The unrealized losses on our available-for-sale securities were caused by fluctuations in market value and interest rates as a result of the economic environment. As the decline in market value are attributable to changes in market conditions and not credit quality, and because we have concluded currently that we neither intend to sell nor is it more likely than not that we will be required to sell these investments prior to a recovery of par value, we do not consider these investments to be other-than temporarily impaired as of December 31, 2014.

Realized gains and losses from the sale of available-for-sale securities were not significant in any period presented.

Fair Value Accounting—We apply the following fair value hierarchy for disclosure of the inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.

Level 3—Unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.

We measure the fair value of money market funds and certain U.S. government and agency securities using quoted prices in active markets for identical assets. The fair value of all other financial instruments was based on quoted prices for similar asserts in active markets, or model driven valuations using significant inputs derived from or corroborated by observable market data.

We classify investments within Level 1 if quoted prices are available in active markets for identical securities.

We classify items within Level 2 if the investments are valued using model driven valuations using observable inputs such as quoted market prices, benchmark yields, reported trades, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. Investments are held by custodians who obtain investment prices from a third-party pricing provider that incorporates standard inputs in various asset price models.

Fair Value of Financial Instruments

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 and December 31, 2013 (in thousands):



	December 31, 2014								December 31, 2013
	Aggregate Fair Value		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs		Aggregate Fair Value		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
			(Level 1)		(Level 2)		(Level 3)				(Level 1)		(Level 2)		(Level 3)
Assets:
Corporate debt securities	$	589,016	$	—	$	589,016	$	—	$	604,317	$	—	$	604,317	$	—
Commercial paper	51,155		—		51,155		—		71,363		—		71,363		—
Municipal bonds	39,721		—		39,721		—		38,843		—		38,843		—
Certificates of deposit and term deposits	22,854		—		22,854		—		12,648		—		12,648		—
Money market funds	13,311		13,311		—		—		5,724		5,724		—		—
U.S. government and agency securities	5,744		1,998		3,746		—		2,001		—		2,001		—
Total	$	721,801	$	15,309	$	706,492	$	—	$	734,896	$	5,724	$	729,172	$	—

Liabilities:
Contingent consideration	$	—	$	—	$	—	$	—	$	1,850	$	—	$	—	$	1,850
Total	$	—	$	—	$	—	$	—	$	1,850	$	—	$	—	$	1,850

Reported as:
Cash equivalents	$	13,311							$	7,724
Short-term investments	436,766								375,497
Long-term investments	271,724								351,675
Total	$	721,801							$	734,896

There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the year ended December 31, 2014 and December 31, 2013.

We classified the fair value of contingent consideration arising from the acquisition of Coyote Point Systems, Inc. (“Coyote”) (see Note 6), as a Level 3 liability since it is based on a probability-based income approach that includes significant unobservable inputs. Significant inputs used in the determination of fair value based on the probability-weighted income approach primarily include internal cash flow projections, percentage probability of occurrence and discount rates.

The change in the fair value of our contingent consideration liability was as follows (in thousands):



As of December 31, 2013	$1,850
Less change in fair value of contingent consideration	(1,850)
As of December 31, 2014	$—

Decreases in the projected revenues of Coyote following the acquisition resulted in reductions to the fair value of the contingent consideration and the changes are included in Research and development expense in the consolidated statements of operations.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

We measure certain assets, including Goodwill, Other intangible assets—net, and investments in privately-held companies at fair value on a nonrecurring basis when there are identifiable events or changes in circumstances that may have a significant adverse impact on the fair value of these assets.

During fiscal 2014, a decrease in the projected cash flow of the other intangible assets acquired from Coyote resulted in an impairment charge of $2.4 million to adjust the total fair value of the other intangible assets acquired from Coyote to $2.0 million. The impairment charge is included within Cost of product revenue in the consolidated statements of operations.

As of December 31, 2013, we did not have any assets or liabilities measured at fair value on a nonrecurring basis.

Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Matching contribution on employee contributions, Percent	50.00%
Maximum contribtuion percentage of each employee's eligible earnings, Percent	4.00%
Matching contributions to the RRSP and 401(k) Plans	$ 2.5	$ 2.1	$ 1.8

Segment Information

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

SEGMENT INFORMATION

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. Our chief operating decision maker is our chief executive officer. Our chief executive officer reviews financial information presented on a consolidated basis, accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. We have one business activity, and there are no segment managers who are held accountable for operations, operating results and plans for levels or components below the consolidated unit level. Accordingly, we have determined that we have one operating segment, and therefore, one reportable segment.

Revenue by geographic region is based on the billing address of the customer. The following tables set forth revenue and property and equipment by geographic region (in thousands):



	Year Ended December 31,
Revenue	2014		2013		2012
Americas:
United States	$	200,294	$	162,327	$	145,369
Other Americas	124,365		90,459		71,687
Total Americas	324,659		252,786		217,056
Europe, Middle East, and Africa (“EMEA”)	270,537		208,979		184,175
Asia Pacific and Japan (“APAC”)	175,168		153,532		132,408
Total revenue	$	770,364	$	615,297	$	533,639




Property and Equipment—net	December 31, 2014		December 31, 2013
Americas:
United States	$	46,116	$	29,334
Canada	6,054		4,372
Other Americas	875		45
Total Americas	53,045		33,751
EMEA	3,256		1,273
APAC	2,618		1,628
Total property and equipment—net	$	58,919	$	36,652

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

+ Details

Summary of Significant Accounting Policies , Other Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2014
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of finite-lived intangible assets	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of finite-lived intangible assets	5 years

Summary of Significant Accounting Policies , Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued warranty balance—beginning of the period	$ 3,037	$ 2,309	$ 2,582
Warranty costs incurred	(3,653)	(3,444)	(2,669)
Provision for warranty for the year, including warranty liabilities assumed in connection with an acquisition	5,209	3,965	2,639
Adjustment related to pre-existing warranties	(324)	207	(243)
Accrued warranty balance—end of the period	$ 4,269	$ 3,037	$ 2,309
Hardware Products [Member]
Warranties [Line Items]
Warranty length	1 year
Software Products [Member]
Warranties [Line Items]
Warranty length	90 days

Income Taxes , Provision for Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 17,717	$ 43,384	$ 43,765
State	1,110	2,490	1,992
Foreign	8,921	4,175	2,266
Total current	27,748	50,049	48,023
Deferred:
Federal	6,742	(17,149)	(9,677)
State	(36)	(1,232)	(186)
Foreign	1,752	0	0
Total deferred	8,458	(18,381)	(9,863)
Total provision for income taxes	$ 36,206	$ 31,668	$ 38,160

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 25,343	$ 44,273	$ 66,836
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,028	15,623	11,564
Amortization of investment premiums	8,703	11,634	12,962
Stock-based compensation	58,994	43,909	30,690
Excess tax benefit from stock-based compensation	0	(2,974)	(12,069)
Other non-cash items—net	4,140	961	881
Changes in operating assets and liabilities:
Accounts receivable—net	(55,888)	(22,080)	(12,120)
Inventory	(32,459)	(35,093)	(11,303)
Deferred tax assets	9,072	(18,750)	(9,254)
Prepaid expenses and other current assets	(16,000)	(907)	791
Other assets	(1,302)	1,243	2,470
Accounts payable	18,033	10,485	961
Accrued liabilities	7,120	3,602	2,171
Accrued payroll and compensation	10,835	6,013	4,599
Other liabilities	14,318	(1,948)	(1,870)
Deferred revenue	127,416	68,871	68,292
Income taxes payable	(3,771)	22,522	28,265
Net cash provided by operating activities	196,582	147,384	183,866
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investments	(497,084)	(552,778)	(601,087)
Sales of investments	41,755	57,897	26,268
Maturities of investments	458,193	369,659	415,440
Purchases of property and equipment	(32,197)	(13,877)	(22,083)
Payments made in connection with business acquisitions—net of cash acquired	(17)	(7,635)	(1,249)
Net cash used in investing activities	(29,350)	(146,734)	(182,711)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	55,324	25,584	38,087
Taxes paid related to net share settlement of equity awards	(10,598)	(1,452)	0
Excess tax benefit from stock-based compensation	0	2,974	12,069
Repurchase and retirement of common stock	(43,977)	(33,529)	0
Net cash provided by (used in) financing activities	749	(6,423)	50,156
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	(600)	(1,329)	(326)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	167,381	(7,102)	50,985
CASH AND CASH EQUIVALENTS—Beginning of year	115,873	122,975	71,990
CASH AND CASH EQUIVALENTS—End of year	283,254	115,873	122,975
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes—net	40,551	25,445	17,088
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Liability for purchase of property and equipment and asset retirement obligations	3,275	4,253	398
Liability incurred in connection with business acquisition	0	100	201
Liability incurred for repurchase of common stock	$ 0	$ 5,420	$ 0

Goodwill and Other Intangible Assets - Net (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]

The following tables present other intangible assets—net (in thousands):



	December 31, 2014
	Weighted-Average Useful Life (in Years)	Gross		Accumulated Amortization		Net
Other intangible assets—net:
Developed technology	3.6	$	5,606	$	3,128	$	2,478
Customer relationships	6.0	500		146		354
Total other intangible assets—net		$	6,106	$	3,274	$	2,832



	December 31, 2013
	Weighted-Average Useful Life (in Years)	Gross		Accumulated Amortization		Net
Other intangible assets—net:
Developed technology	4.6	$	8,971	$	2,568	$	6,403
Customer relationships	6.0	500		62		438
Total other intangible assets—net		$	9,471	$	2,630	$	6,841

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table summarizes estimated future amortization expense of Other intangible assets—net for future fiscal years (in thousands):



	Amount
Fiscal Years:
2015	$	1,091
2016	785
2017	425
2018	425
2019	106
Total	$	2,832

Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Short-term	$ 368,929	$ 293,664
Long-term	189,828	138,964
Total deferred revenue	558,757	432,628
Product [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	4,642	2,915
Services and other [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 554,115	$ 429,713

Goodwill and Other Intangible Assets - Net - Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Fiscal Years:
2015	$ 1,091
2016	785
2017	425
2018	425
2019	106
Total	$ 2,832	$ 6,841

Defined Contribution Plans	12 Months Ended
Defined Contribution Plans	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
DEFINED CONTRIBUTION PLANS	DEFINED CONTRIBUTION PLANS Our tax-deferred savings plan under our 401(k) Plan, permits participating employees to defer a portion of their pre-tax earnings. In Canada, we have a Group Registered Retirement Savings Plan program (the “RRSP”) which permits participants to make tax deductible contributions. Our board of directors approved 50% matching contributions on employee contributions up to 4% of each employee’s eligible earnings. Our matching contributions to the 401(k) Plans and RRSP for fiscal 2014, fiscal 2013, and fiscal 2012 were $2.5 million, $2.1 million, and $1.8 million, respectively.

Goodwill and Other Intangible Assets - Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 21, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,824	$ 2,872
Finite-Lived Intangible Assets, Net [Abstract]
Gross	6,106	9,471
Accumulated Amortization	3,274	2,630
Total	2,832	6,841
Amortization expense	$ 1,500	$ 1,700	$ 1,000
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable life of purchased indentifiable intangible assets	3 years 6 months 26 days	4 years 7 months 17 days
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 5,606	$ 8,971
Accumulated Amortization	3,128	2,568
Total	$ 2,478	$ 6,403
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable life of purchased indentifiable intangible assets	6 years	6 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 500	$ 500
Accumulated Amortization	146	62
Total	354	$ 438
Coyote Point Systems, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 2,824
Finite-Lived Intangible Assets, Net [Abstract]
Impairment of long-lived assets	2,400
Fair value of other intangible assets	2,000
Coyote Point Systems, Inc. [Member] \| Developed Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Fair value of other intangible assets	2,000
Cost of Sales [Member] \| Coyote Point Systems, Inc. [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Impairment of long-lived assets	$ 2,400

Accumulated Other Comprehensive (Loss) Income (Tables)

12 Months Ended

Dec. 31, 2014

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive (Loss) Income [Table Text Block]

The following table summarizes the changes in accumulated balances of other comprehensive income for fiscal 2014 and fiscal 2013 (in thousands):



	December 31, 2014
	Foreign Currency Translation Gains and Losses			Unrealized Gains and Losses on Investments			Tax benefit or provision related to items of other comprehensive income or loss			Total
Beginning balance	$	333		$	1,168		$	(409	)	$	1,092
Other comprehensive loss before reclassifications				(1,694		)	595			(1,099		)
Amounts reclassified from accumulated other comprehensive (loss) income	(333		)	(14		)	5			(342		)
Net current-period other comprehensive loss	(333		)	(1,708		)	600			(1,441		)
Ending balance	$	—		$	(540	)	$	191		$	(349	)



	December 31, 2013
	Foreign Currency Translation Gains and Losses			Unrealized Gains and Losses on Investments			Tax benefit or provision related to items of other comprehensive income or loss			Total
Beginning balance	$	1,950		$	1,755		$	(614	)	$	3,091
Other comprehensive loss before reclassifications	(1,617		)	(573		)	200			(1,990		)
Amounts reclassified from accumulated other comprehensive (loss) income	—			(14		)	5			(9		)
Net current-period other comprehensive loss	(1,617		)	(587		)	205			(1,999		)
Ending balance	$	333		$	1,168		$	(409	)	$	1,092

Reclassification out of Accumulated Other Comprehensive (Loss) Income [Table Text Block]

The following table provides details about the reclassification out of accumulated other comprehensive (loss) income for fiscal 2014 and fiscal 2013 (in thousands):



December 31, 2014
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement Where Net Income is Presented
Foreign currency translation losses	$	(333	)	Other expense—net
Unrealized gains on investments	$	(14	)	Other expense—net
Tax provision related to items of other comprehensive income or loss	5			Provision for income taxes
Total reclassification for the period	$	(342	)



December 31, 2013
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement Where Net Income is Presented
Unrealized gains on investments	$	(14	)	Other expense—net
Tax provision related to items of other comprehensive income or loss	5			Provision for income taxes
Total reclassification for the period	$	(9	)

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 10,600	$ 9,800	$ 8,700
Open purchase orders	62,804
Other contract commitments	$ 21,006

Stockholders' Equity , Performance Stock Units (Details) - Performance Shares [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Performance Share, Weighted Average Assumptions [Abstract]
Expected term in years	2 years 11 months 23 days	2 years 11 months 19 days
Volatility	46.30%	50.10%
Risk-free interest rate	0.90%	0.70%
Dividend rate	0.00%	0.00%
Granted	120,000	180,000
Granted, weighted-average grant-date fair value per share (in dollars per share)	$ 21.05	$ 22.06
Forfeited		50,000
Compensation cost not yet recognized	$ 3.2
Compensation cost not yet recognized period of recognition	2 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share target range, percent	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share target range, percent	150.00%

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Income before income taxes consisted of the following (in thousands):



	Year Ended December 31,
	2014		2013			2012
Domestic	$	35,778	$	83,076		$	95,730
Foreign	25,771		(7,135		)	9,266
Total income before income taxes	$	61,549	$	75,941		$	104,996

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes consisted of the following (in thousands):



	Year Ended December 31,
	2014			2013			2012
Current:
Federal	$	17,717		$	43,384		$	43,765
State	1,110			2,490			1,992
Foreign	8,921			4,175			2,266
Total current	$	27,748		$	50,049		$	48,023
Deferred:
Federal	$	6,742		$	(17,149	)	$	(9,677	)
State	(36		)	(1,232		)	(186		)
Foreign	1,752			—			—
Total deferred	8,458			(18,381		)	(9,863		)
Provision for income taxes	$	36,206		$	31,668		$	38,160

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate as follows (in thousands):



	Year Ended December 31,
	2014			2013			2012
Tax at federal statutory tax rate	$	21,542		$	26,579		$	36,749
Stock-based compensation expense	7,367			4,571			1,570
State taxes—net of federal benefit	975			419			1,186
Domestic production activities deduction	—			(3,256		)	(1,813		)
Foreign tax credit	(4,433		)	(2,853		)	(2,348		)
Research and development credit	(880		)	(1,650		)	(144		)
Foreign income taxed at different rates	(406		)	2,927			(1,626		)
Foreign withholding taxes	9,085			6,622			2,185
Other	2,956			(1,691		)	2,401
Total provision for income taxes	$	36,206		$	31,668		$	38,160

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets as of the years ended are presented below (in thousands):



	December 31, 2014		December 31, 2013
Deferred tax assets:
Net operating loss carryforward	$	1,293	$	2,183
Deferred revenue	31,545		47,341
Nondeductible reserves and accruals	20,904		16,055
Depreciation and amortization	193		(465		)
General business credit carryforward	2,155		439
Stock-based compensation expense	16,463		15,468
Other	11		17
Total deferred tax assets	$	72,564	$	81,038

Summary of Income Tax Contingencies [Table Text Block]

The aggregate changes in the balance of unrecognized tax benefits are as follows (in thousands):



	Year Ended December 31,
	2014		2013			2012
Unrecognized tax benefits, beginning of year	$	29,604	$	27,808		$	19,269
Gross increases for tax positions related to the current year	14,547		4,713			7,550
Gross increases for tax positions related to the prior year	—		405			1,479
Gross decreases for tax positions related to the prior year	—		(3,322		)	(490		)
Unrecognized tax benefits, end of year	$	44,151	$	29,604		$	27,808

Stockholders' Equity , Share Repurchase Program (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 06, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased in the period, value	$ 38,557	$ 38,949
Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount			$ 200,000
Stock repurchased in the period, shares	1,647
Stock repurchased in the period, value	$ 38,557
Remaining authorized repurchase amount under the program	$ 122,500

Income Taxes , Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits that would favoraby affect effective tax rate	$ 43,400
Accrued interest and penalties related to uncertain tax benefits	1,700	$ 1,000	$ 1,500
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	29,604	27,808	19,269
Gross increases for tax positions related to the current year	14,547	4,713	7,550
Gross increases for tax positions related to the prior year	0	405	1,479
Gross decreases for tax positions related to the prior year	0	(3,322)	(490)
Unrecognized tax benefits, end of year	44,151	29,604	27,808
Liability for uncertain tax positions	$ 45,100	$ 30,200	$ 28,800

Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Raw materials	$ 10,617	$ 8,355
Finished goods	58,860	40,317
Inventory	69,477	48,672
Finished goods held by distributors	1,200	900
Materials at contract manufacturers	$ 4,800	$ 4,300

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

The following table summarizes our future principal contractual obligations as of December 31, 2014 (in thousands):



	Total		2015		2016		2017		2018		2019		Thereafter
Operating lease commitments	$	42,624	$	11,535	$	9,265	$	7,368	$	6,732	$	4,726	$	2,998
Less: Sublease rental income	431		431		—		—		—		—		—
Operating lease commitments—net	42,193		11,104		9,265		7,368		6,732		4,726		2,998
Inventory purchase commitments	62,804		62,804		—		—		—		—		—
Other contractual commitments	21,006		18,169		1,861		976		—		—		—
Total	$	126,003	$	92,077	$	11,126	$	8,344	$	6,732	$	4,726	$	2,998

Summary of Significant Accounting Policies , Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2014
Minimum [Member]
Revenue from External Customer [Line Items]
Revenue recognition period (in years)	1 year
Maximum [Member]
Revenue from External Customer [Line Items]
Revenue recognition period (in years)	3 years