Fortinet (FTNT) 10-Q 5 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 29, 2013
Document Information [Line Items]	'	'
Entity Registrant Name	'FORTINET INC	'
Entity Central Index Key	'0001262039	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	163,460,178

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
CURRENT ASSETS:	'	'
Cash and cash equivalents	$144,546	$122,975
Short-term investments	368,472	290,719
Accounts receivable—Net	107,802	107,642
Inventory	46,876	21,060
Prepaid expenses and other current assets	38,271	26,878
Total current assets	705,967	569,274
PROPERTY AND EQUIPMENT—Net	28,380	25,638
LONG-TERM INVESTMENTS	327,987	325,892
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	10,612	2,117
DEFERRED TAX ASSETS—Non-current	51,996	48,525
OTHER ASSETS	3,200	4,051
TOTAL ASSETS	1,128,142	975,497
CURRENT LIABILITIES:	'	'
Accounts payable	33,257	20,816
Accrued liabilities	32,317	22,263
Accrued payroll and compensation	30,450	28,957
Deferred revenue	271,302	247,268
Total current liabilities	367,326	319,304
DEFERRED REVENUE—Non-current	128,871	115,917
INCOME TAXES PAYABLE—Non-current	30,568	28,778
OTHER LIABILITIES	1,424	564
Total liabilities	528,189	464,563
COMMITMENTS AND CONTINGENCIES (Note 8)	'	'
STOCKHOLDERS' EQUITY:	'	'
Common stock, $0.001 par value — 300,000 shares authorized; 163,329 and 161,757 shares issued and 163,329 and 160,348 shares outstanding as of September 30, 2013 and December 31, 2012, respectively	163	162
Additional paid-in capital	455,279	400,075
Treasury stock	0	-2,995
Accumulated other comprehensive income	1,653	3,091
Retained earnings	142,858	110,601
Total stockholders' equity	599,953	510,934
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$1,128,142	$975,497

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical (Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Common Stock, par value	$0.00	$0.00
Common Stock, shares authorized	300,000,000	300,000,000
Common Stock, shares issued	163,329,000	161,757,000
Common Stock, shares outstanding	163,329,000	160,348,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUE:	'	'	'	'
Product	$69,687	$63,027	$194,162	$177,923
Services	83,883	69,782	239,447	197,332
Ratable and other revenue	1,129	3,459	4,338	7,222
Total revenue	154,699	136,268	437,947	382,477
COST OF REVENUE:	'	'	'	'
Product	27,126	23,995	77,032	66,997
Services	16,374	13,166	48,207	36,846
Ratable and other revenue	430	647	1,527	2,135
Total cost of revenue	43,930	37,808	126,766	105,978
GROSS PROFIT:	'	'	'	'
Product	42,561	39,032	117,130	110,926
Services	67,509	56,616	191,240	160,486
Ratable and other revenue	699	2,812	2,811	5,087
Total gross profit	110,769	98,460	311,181	276,499
OPERATING EXPENSES:	'	'	'	'
Research and development	26,421	20,498	74,913	60,553
Sales and marketing	56,687	44,743	162,660	131,038
General and administrative	9,382	7,449	26,161	19,473
Total operating expenses	92,490	72,690	263,734	211,064
OPERATING INCOME	18,279	25,770	47,447	65,435
INTEREST INCOME	1,282	1,318	3,988	3,606
OTHER EXPENSE—Net	-1,151	-317	-1,036	-315
INCOME BEFORE INCOME TAXES	18,410	26,771	50,399	68,726
PROVISION FOR INCOME TAXES	7,381	9,565	18,142	23,397
NET INCOME	$11,029	$17,206	$32,257	$45,329
Net income per share:	'	'	'	'
Basic (in dollars per share)	$0.07	$0.11	$0.20	$0.29
Diluted (in dollars per share)	$0.07	$0.10	$0.19	$0.27
Weighted-average shares outstanding:	'	'	'	'
Basic (in shares)	162,906	158,751	162,150	157,416
Diluted (in shares)	168,666	166,791	168,054	166,127

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Comprehensive Income [Abstract]	'	'	'	'
Net income	$11,029	$17,206	$32,257	$45,329
Other comprehensive income (loss), net of reclassification adjustments:	'	'	'	'
Foreign currency translation gains (losses)	912	1,092	-901	867
Unrealized gains (losses) on investments	600	1,968	-826	3,441
Unrealized losses on cash flow hedges	0	-19	0	0
Tax (provision) benefit related to items of other comprehensive income or loss	-209	-618	289	-1,133
Other comprehensive income (loss), net of tax	1,303	2,423	-1,438	3,175
Comprehensive income	$12,332	$19,629	$30,819	$48,504

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net income	$32,257	$45,329
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Depreciation and amortization	11,511	8,076
Amortization of investment premiums	8,900	10,002
Stock-based compensation expense	31,784	23,928
Excess tax benefit from employee stock option plans	-2,504	-9,611
Other non-cash items, net	520	893
Changes in operating assets and liabilities:	'	'
Accounts receivable—net	589	5,680
Inventory	-31,344	-14,977
Prepaid expenses and other current assets	219	-71
Other assets	-13,928	-2,630
Accounts payable	11,054	3,049
Accrued payroll and compensation	1,400	1,563
Accrued and other liabilities	2,631	1,301
Deferred revenue	36,425	45,192
Income taxes payable	11,202	15,849
Net cash provided by operating activities	100,716	133,573
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Purchase of investments	-419,124	-523,389
Sales of investments	25,488	25,768
Maturities of investments	303,852	343,174
Purchases of property and equipment	-6,729	-20,283
Payments made in connection with acquisitions, net of cash acquired	-7,635	-749
Net cash used in investing activities	-104,148	-175,479
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Proceeds from issuance of common stock	24,470	36,006
Taxes paid related to net share settlement of equity awards	-966	0
Excess tax benefit from employee stock option plans	2,504	9,611
Net cash provided by financing activities	26,008	45,617
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	-1,005	-235
NET INCREASE IN CASH AND CASH EQUIVALENTS	21,571	3,476
CASH AND CASH EQUIVALENTS—Beginning of year	122,975	71,990
CASH AND CASH EQUIVALENTS—End of year	144,546	75,466
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:	'	'
Cash paid for income taxes	19,721	10,335
NON-CASH INVESTING AND FINANCING ACTIVITIES:	'	'
Purchase of property and equipment not yet paid	1,349	722
Liability incurred in connection with business acquisition	$100	$201

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation and Preparation
	The unaudited condensed consolidated financial statements of Fortinet, Inc. and its wholly owned subsidiaries (collectively, “we,” “us,” or “our”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information as well as the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements, and should be read in conjunction with our audited consolidated financial statements as of and for the fiscal year ended December 31, 2012, contained in our Annual Report on Form 10-K (“Form 10-K”) filed with the SEC on February 27, 2013. In the opinion of management, all adjustments, which only includes normal recurring adjustments, considered necessary for a fair presentation have been included. All intercompany balances, transactions and cash flows have been eliminated. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the operating results for any subsequent quarter, for the full year or for any future periods. The condensed consolidated balance sheets as of December 31, 2012 are derived from the audited consolidated financial statements for the year ended December 31, 2012.
	The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates.
	During the three and nine months ended September 30, 2013, we recorded a non-recurring out-of-period adjustment of $3.0 million to correct the presentation on our condensed consolidated balance sheets relating to our repurchase of 1,409,264 shares during the fiscal year ended December 31, 2009. This reclassification adjustment resulted in a decrease to the outstanding treasury stock balance and a corresponding decrease to additional paid-in capital. We believe the impact of the adjustment is not material to the current or prior fiscal periods. The shares that we repurchased in 2009 were retired immediately after repurchase. There was no outstanding treasury stock balance at September 30, 2013.
	There have been no material changes in our significant accounting policies as of and for the three and nine months ended September 30, 2013, as compared to the significant accounting policies described in the Form 10-K, except for the inclusion of policies related to goodwill and other indefinite-lived assets, long-term investments, and stock-based compensation expense pertaining to performance stock units (“PSUs”).
	Goodwill and other indefinite-lived intangible assets
	Goodwill represents the excess of purchase consideration over the estimated fair value of net assets of businesses acquired in a business combination. Goodwill and other indefinite-lived intangible assets such as in-process research and development 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 September 30, 2013, 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 does not exceed 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.
	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 and other intangible assets for impairment between annual tests in the presence of impairment indicators. Acquired in-process research and development assets are classified as indefinite-lived intangible assets until the successful completion or abandonment of the associated research and development efforts. Upon successful completion of the associated research and development efforts, the useful life of the asset is determined and the asset is amortized over its useful life. If the associated research and development efforts are abandoned, an impairment loss is recognized for the carrying value of the related asset.
	Long-term 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 Long-term investments 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. As of September 30, 2013, we only have one investment of $2.0 million in a privately-held company accounted for under the cost method.
	Stock-Based Compensation Expense - Performance Stock Units
	PSUs are restricted stock units (“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 grant date and is based on the market price of our common stock on the grant date 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.
	Certain prior period amounts have been combined on the condensed consolidated balance sheets and statements of cash flows to conform to the current period presentation.
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2013-02, Comprehensive Income (Topic 220)—Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income. For other amounts that are not required under GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under GAAP that provide additional detail about those amounts. We adopted ASU 2013-02 on January 1, 2013, and presented the effects within Note 16, Accumulated Other Comprehensive Income.
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740)-Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 provides guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, similar tax loss, or tax credit carryforward exists. This new standard requires the netting of unrecognized tax benefits (“UTBs”) against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. UTBs will be netted against all available same-jurisdiction loss or other tax carryforwards that would be utilized, rather than only against carryforwards that are created by the UTBs. ASU 2013-11 will be effective for us beginning in the first quarter of fiscal 2014. Early adoption is permitted. Since ASU 2013-11 only impacts financial statement disclosure requirements for unrecognized tax benefits, we do not expect its adoption to have an impact on our financial position or results of operations.

Investment_in_a_PrivatelyHeld_

Investment in a Privately-Held Company	9 Months Ended
	Sep. 30, 2013
Investments, All Other Investments [Abstract]	'
INVESTMENT IN A PRIVATELY-HELD COMPANY	'
	INVESTMENT IN PRIVATELY-HELD COMPANY
	In August 2013, we invested $2.0 million in equity securities in HyTrust, a privately-held company. This investment is accounted for as a cost-basis investment, 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 entity. As of September 30, 2013, no events have occurred that would adversely affect the carrying value of this investment. We did not record any impairment charges for this investment during the three and nine months ended September 30, 2013.

Financial_Instruments_and_Fair

Financial Instruments and Fair Value	9 Months Ended
	Sep. 30, 2013
Financial Instruments and Fair Value [Abstract]	'
FINANCIAL INSTRUMENTS AND FAIR VALUE	'
	FINANCIAL INSTRUMENTS AND FAIR VALUE
	The following table summarizes our investments ($ amounts in 000’s):
		September 30, 2013
		Amortized	Unrealized		Unrealized		Fair
		Cost	Gains		Losses		Value
	U.S. government and agency securities	2,000	—		—		2,000
	Corporate debt securities	566,962	1,336		(441	)	567,857
	Commercial paper	81,955	13		(6	)	81,962
	Municipal bonds	34,554	44		(14	)	34,584
	Certificates of deposit and term deposits	8,053	3		—		8,056
	Total available-for-sale securities	693,524	1,396		(461	)	694,459
		December 31, 2012
		Amortized	Unrealized		Unrealized		Fair
		Cost	Gains		Losses		Value
	Corporate debt securities	529,738	1,814		(161	)	531,391
	Commercial paper	39,229	22		(6	)	39,245
	Municipal bonds	36,787	83		—		36,870
	Certificates of deposit and term deposits	9,099	6		—		9,105
	Total available-for-sale securities	614,853	1,925		(167	)	616,611
	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, as of September 30, 2013 ($ amounts in 000’s):
		Less Than 12 Months			12 Months or Greater				Total
		Fair	Unrealized		Fair		Unrealized		Fair	Unrealized
		Value	Losses		Value		Losses		Value	Losses
	Corporate debt securities	232,721	(434	)	5,309		(7	)	238,030	(441	)
	Commercial paper	20,076	(6	)	—		—		20,076	(6	)
	Municipal bonds	12,941	(14	)	—		—		12,941	(14	)
	Total available-for-sale securities	265,738	(454	)	5,309		(7	)	271,047	(461	)
	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, as of December 31, 2012 ($ amounts in 000’s):
		Less Than 12 Months			12 Months or Greater				Total
		Fair	Unrealized		Fair		Unrealized		Fair	Unrealized
		Value	Losses		Value		Losses		Value	Losses
	Corporate debt securities	133,006	(156	)	5,010		(5	)	138,016	(161	)
	Commercial paper	8,464	(6	)	—		—		8,464	(6	)
	Total available-for-sale securities	141,470	(162	)	5,010		(5	)	146,480	(167	)
	The contractual maturities of our investments were as follows ($ amounts in 000’s)
		September 30,	December 31,
		2013	2012
	Due within one year	368,472	290,719
	Due within one to three years	325,987	325,892
	Total available-for-sale securities	694,459	616,611
	Realized gains or losses from the sale of available-for-sale securities were not significant for any of the periods presented.
	The following table presents the fair value of our financial assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 ($ amounts in 000’s):
		September 30, 2013					December 31, 2012
		Aggregate	Quoted		Significant		Aggregate		Quoted	Significant
		Fair	Prices in		Other		Fair		Prices in	Other
		Value	Active		Observable		Value		Active	Observable
			Markets For		Remaining				Markets For	Remaining
			Identical		Inputs				Identical	Inputs
			Assets						Assets
			(Level 1)		(Level 2)				(Level 1)	(Level 2)
	U.S. government and agency securities	2,000	—		2,000		—		—	—
	Corporate debt securities	574,578	—		574,578		531,391		—	531,391
	Commercial paper	83,262	—		83,262		41,994		—	41,994
	Municipal bonds	34,584	—		34,584		36,870		—	36,870
	Certificates of deposit and term deposits	8,056	—		8,056		9,105		—	9,105
	Money market funds	45,897	45,897		—		39,871		39,871	—
		748,377	45,897		702,480		659,231		39,871	619,360
	Reported as:
	Cash equivalents	53,918					42,620
	Short-term investments	368,472					290,719
	Long-term investments	325,987					325,892
	Total	748,377					659,231
	There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the three and nine months ended September 30, 2013.

Inventory

Inventory	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
INVENTORY	'
	INVENTORY
	Inventory consisted of the following ($ amounts in 000’s):
		September 30,	December 31,
		2013	2012
	Raw materials	7,765	4,958
	Finished goods	39,111	16,102
	Inventory	46,876	21,060

Property_and_EquipmentNet

Property and Equipment—Net	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
PROPERTY AND EQUIPMENT—NET	'
	PROPERTY AND EQUIPMENT—Net
	Property and equipment consisted of the following ($ amounts in 000’s):
		September 30,		December 31,
		2013		2012
	Land	13,895		13,895
	Building and building improvements	610		610
	Evaluation units	21,986		18,322
	Computer equipment and software	22,785		17,176
	Furniture and fixtures	1,709		1,501
	Construction-in-process	1,295		—
	Leasehold improvements and tooling	5,532		5,354
	Total property and equipment	67,812		56,858
	Less: accumulated depreciation	(39,432	)	(31,220	)
	Property and equipment—net	28,380		25,638
	Depreciation expense was $3.8 million and $2.7 million for the three months ended September 30, 2013 and September 30, 2012, respectively. Depreciation expense was $10.4 million and $7.2 million for the nine months ended September 30, 2013 and September 30, 2012, respectively.

Net_Income_Per_Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
NET INCOME PER SHARE	'
	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 the employee stock purchase plan (“ESPP”). Potentially 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 ($ and share amounts in 000’s, except per share amounts):
		Three Months Ended		Nine Months Ended
		September 30,	September 30,	September 30,	September 30,
		2013	2012	2013	2012
	Numerator:
	Net income	11,029	17,206	32,257	45,329
	Denominator:
	Basic shares:
	Weighted-average common stock outstanding-basic	162,906	158,751	162,150	157,416
	Diluted shares:
	Weighted-average common stock outstanding-basic	162,906	158,751	162,150	157,416
	Effect of potentially dilutive securities:
	Stock options	5,525	8,019	5,844	8,694
	RSUs	213	—	50	—
	ESPP	22	21	10	17
	Weighted-average shares used to compute diluted net income per share	168,666	166,791	168,054	166,127
	Net income per share:
	Basic	0.07	0.11	0.2	0.29
	Diluted	0.07	0.1	0.19	0.27
	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 000’s):
		Three Months Ended		Nine Months Ended
		September 30,	September 30,	September 30,	September 30,
		2013	2012	2013	2012
	Stock options	6,640	5,686	7,364	6,847
	RSUs	1,416	388	2,383	130
	ESPP	407	303	399	300
		8,463	6,377	10,146	7,277

Deferred_Revenue

Deferred Revenue	9 Months Ended
	Sep. 30, 2013
Deferred Revenue Disclosure [Abstract]	'
DEFERRED REVENUE	'
	DEFERRED REVENUE
	Deferred revenue consisted of the following ($ amounts in 000’s):
		September 30,	December 31,
		2013	2012
	Product	5,114	5,411
	Services	389,571	348,548
	Ratable and other revenue	5,488	9,226
	Total deferred revenue	400,173	363,185
	Reported As:
	Current	271,302	247,268
	Non-current	128,871	115,917
	Total deferred revenue	400,173	363,185

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES
	Leases—We lease certain facilities under various non-cancelable operating leases, which expire through 2020. Rent expense was $2.4 million and $2.1 million for the three months ended September 30, 2013 and September 30, 2012, respectively. Rent expense was $7.1 million and $6.5 million for the nine months ended September 30, 2013 and September 30, 2012, respectively. Rent expense is recognized using the straight-line method over the term of the lease. The aggregate future non-cancelable minimum rental payments on operating leases as of September 30, 2013 are as follows ($ amounts in 000’s):
		Rental
		Payment
	Fiscal Years:
	2013 (remainder)	2,675
	2014	7,715
	2015	5,342
	2016	4,279
	2017	3,738
	Thereafter	7,779
	Total	31,528
	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 issue non-cancelable purchase orders to some of our independent contract manufacturers. As of September 30, 2013, we had $46.6 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 September 30, 2013, we had $10.2 million in other purchase commitments.
	Warranties—We generally provide a 1-year warranty on hardware products and a 90-day warranty on software.
	Accrued warranty activities are summarized as follows ($ amounts in 000’s):
		For The Nine Months Ended
		September 30,		September 30,
		2013		2012
	Accrued warranty balance—beginning of the period	2,309		2,582
	Warranty costs incurred	(2,670	)	(1,843	)
	Provision for warranty, including warranty assumed from Xtera	3,134		1,604
	Changes in prior period estimates	274		(307	)
	Accrued warranty balance—end of the period	3,047		2,036
	Litigation—We are involved in disputes, litigation, and other legal actions, including, but not limited to, the matters described below. We are 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. Unless otherwise noted below, during the period presented, we have not: recorded any material 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.
	In July 2010, Network Protection Sciences, LLC (“NPS”), a non-practicing entity, filed a complaint in the United States District Court for the Eastern District of Texas alleging patent infringement by us and other defendants. In December 2011, the United States District Court for the Eastern District of Texas ordered the case to be transferred to the Northern District of California. In June 2012, the United States District Court for the Northern District of California dismissed the other defendants for misjoinder, and the case thereafter proceeded with Fortinet as the sole defendant. Between June and August 2013, we filed a number of pretrial motions with the Court.  As a result of those motions, the Court found that NPS had engaged in litigation misconduct. The Court also granted our motion to strike NPS’s expert report on the issue of damages. Shortly thereafter, in September 2013, NPS agreed to abandon the case and we did not make any payments related to this case. NPS and its principals furthermore agreed not to sue us on related patents. The litigation related to NPS is no longer material to us.
	In June 2012, we received a letter from SRI International, (“SRI”) claiming that we infringed certain SRI patents. Subsequently, we filed a complaint in the United States District Court for the Northern District of California seeking declaratory relief and a judgment that the SRI patents were invalid, unenforceable and not infringed by any of our products or services. The case is proceeding in the United States District Court for the Northern District of California. The case is currently in the early stages, and we have determined that, as of this time, there is not a reasonable possibility that a material loss has been incurred.
	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 that could potentially expose us to losses in excess of the amount received under the agreement. To date, there have been no claims under such indemnification provisions.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
STOCK PLANS	'
	STOCKHOLDERS’ EQUITY
	Our 2009 Equity Incentive Plan (the “Plan”) permits us to grant awards of stock options, stock appreciation rights, restricted stock, restricted stock units, and performance units or performance shares.
	Employee Stock Options
	In August 2012, we began to primarily grant RSUs instead of stock options to employees, non-employees and members of the board of directors.
	The following table summarizes the weighted-average assumptions relating to our employee stock options:
		Three Months Ended			Nine Months Ended
		September 30,			September 30,		September 30,
		2013			2013		2012
	Expected term in years	4.6			4.6		4.6
	Volatility (%)	47.8			47.8		46.4 - 51.9
	Risk-free interest rate (%)	1.2			1.2		0.7 - 0.9
	Dividend rate (%)	—			—		—
	There were no stock options granted during the three months ended September 30, 2012.
	The following table summarizes the stock option activity and related information for the periods presented below (in 000’s, except per share amounts, exercise prices and contractual life):
		Options Outstanding
		Number			Weighted-		Weighted-		Aggregate
		of Shares			Average		Average		Intrinsic
					Exercise		Remaining		Value ($)
					Price ($)		Contractual
							Life (Years)
	Balance—December 31, 2012	18,571			12.4
	Granted	209			21.11
	Forfeited	(631	)		21.82
	Exercised	(2,210	)		5.33
	Balance—September 30, 2013	15,939			13.12		3.5		134,415
	Options vested and expected to vest—September 30, 2013	15,914			13.11		3.5		134,407
	Options exercisable—September 30, 2013	11,781			9.98		3.1		129,937
	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 September 30, 2013, for all in-the-money options. As of September 30, 2013, total compensation expense related to unvested stock options granted to employees but not yet recognized was $46.0 million, net of estimated forfeitures. This expense is expected to be amortized on a straight-line basis over a weighted-average period of 2.0 years.
	Additional information related to our stock options is summarized below ($ amounts in 000’s, except per share amounts):
		Three Months Ended					Nine Months Ended
		30-Sep-13			30-Sep-12		30-Sep-13			30-Sep-12
	Weighted-average fair value per share granted	8.61			—		8.61			11.13
	Intrinsic value of options exercised	7,880			32,623		36,997			83,313
	Fair value of options vested	5,063			6,823		21,553			19,897
	Restricted Stock Units
	The following table summarizes the activity and related information for RSUs for the period presented below (in 000’s, except per share amounts):
		Restricted Stock Units Outstanding
		Number of Shares			Weighted-Average Grant-Date Fair Value per Share ($)
	Balance—December 31, 2012	830			23.73
	Granted	3,871			21.86
	Forfeited	(251	)		22.97
	Vested	(144	)		24.86
	Balance—September 30, 2013	4,306			21.98
	RSUs expected to vest—September 30, 2013	3,988			22.01
	As of September 30, 2013, total compensation expense related to unvested RSUs that were granted to employees and non-employees, but not yet recognized, was $86.3 million, net of estimated forfeitures. This expense is expected to be amortized on a straight-line basis over a weighted-average vesting period of 3.4 years.
	RSUs settle into shares of common stock upon vesting. RSUs that were previously granted began vesting in August 2013. Upon the vesting of the RSUs, we net-settled the RSUs and withheld a portion of the shares to satisfy minimum statutory employee withholding taxes. Total payment for the employees’ tax obligations to the taxing authorities is reflected as a financing activity within the condensed consolidated statements of cash flows. These net settlements had the effect of share repurchases by us as they reduced and retired the number of shares that would have otherwise been issued as a result of the vesting and did not represent an expense to us.
	The following summarizes the number and value of the shares withheld for employee taxes for the three and nine months ended September 30, 2013 ($ amount in 000’s, except share amount):
	Shares withheld for taxes	45
	Amount withheld for taxes	966
	Performance Stock Units
	During the three and nine months ended September 30, 2013, we granted PSUs under the Plan 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 for the three and nine months ended September 30, 2013:
	Expected term in years	2.97
	Volatility (%)	50.11
	Risk-free interest rate (%)	0.67
	Dividend rate (%)	—
	The target number of shares underlying the PSUs that were granted to certain of our executive officers during the three months ended September 30, 2013, totaled 180,000 shares that had a grant date fair value of $22.06 per share.
	As of September 30, 2013, total compensation expense related to unvested PSUs that were granted to certain of our executive officers, but not yet recognized, was $3.8 million, net of estimated forfeitures. This expense is expected to be amortized on a straight-line basis over a weighted-average vesting period of 2.8 years.
	Employee Stock Purchase Plan
	In determining the fair value of the shares subject to our ESPP, we use the Black-Scholes option pricing model that employs the following weighted-average assumptions:
		Three Months Ended				Nine Months Ended
		September 30, 2013		September 30, 2012		30-Sep-13		30-Sep-12
	Expected term in years	0.5		0.5		0.5		0.5
Volatility (%)	35.1		43.1		44		53.7
Risk-free interest rate (%)	0.1		0.2		0.1		0.1
Dividend rate (%)	—		—		—		—
Additional information related to our ESPP is provided below (in 000’s, except per share amounts):
	Three Months Ended					Nine Months Ended
	September 30, 2013			September 30, 2012		30-Sep-13			30-Sep-12
Weighted-average fair value per share granted ($)	5.04			6.63		6.11			7.06
Shares issued under the ESPP	343,761			288,884		672,397			576,833
Weighted-average price per share issued ($)	17.9			20.29		18.88			18.9
Stock-based Compensation Expense
Stock-based compensation expense is included in costs and expenses as follows ($ amounts in 000’s):
	Three Months Ended					Nine Months Ended
	September 30,			September 30,		September 30,			September 30,
	2013			2012		2013			2012
Cost of product revenue	91			85		277			237
Cost of services revenue	1,297			1,018		3,543			2,704
Research and development	3,548			2,525		9,605			6,774
Sales and marketing	5,215			3,879		13,927			10,797
General and administrative	1,627			1,323		4,432			3,416
Total stock-based compensation expense	11,778			8,830		31,784			23,928
The following table summarizes stock-based compensation expense by award type ($ amounts in 000’s)
	Three Months Ended					Nine Months Ended
	September 30,			September 30,		September 30,			September 30,
	2013			2012		2013			2012
Stock options	5,180			6,985		15,801			19,982
RSUs	5,408			576		12,439			576
ESPP	1,190			1,269		3,544			3,370
Total stock-based compensation expense	11,778			8,830		31,784			23,928
Total income tax benefit from employee stock option plans that is recognized in the consolidated statements of operations is as follows ($ amounts in 000’s):
	Three Months Ended					Nine Months Ended
	September 30,			September 30,		September 30,			September 30,
	2013			2012		2013			2012
Income tax benefit from employee stock option plans	3,176			6,685		9,557			17,073

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	The effective tax rate was 40% for the three months ended September 30, 2013, compared to an effective tax rate of 36% for the three months ended September 30, 2012. The effective tax rate was 36% for the nine months ended September 30, 2013, compared to an effective tax rate of 34% for the nine months ended September 30, 2012. The provision for income taxes for the periods presented is comprised of foreign income taxes, U.S. federal and state taxes, and withholding tax.
	As of September 30, 2013 and December 31, 2012, unrecognized tax benefits were $28.7 million and $27.8 million, respectively. The total amount of $28.3 million in unrecognized tax benefits, if recognized, would favorably impact the effective tax rate.
	It is our policy to classify accrued interest and penalties related to unrecognized tax benefits in the provision for income taxes. As of September 30, 2013, we had accrued approximately $2.3 million for estimated interest related to uncertain tax provisions.
	The State of California has been conducting an audit of our state income tax returns for fiscal 2010 and fiscal 2011. We do not expect this audit to have a significant detrimental effect on our income tax liability nor have a material impact on our results of operations.

Employee_Benefit_Plan

Employee Benefit Plan	9 Months Ended
	Sep. 30, 2013
Employee Benefit Plan [Abstract]	'
EMPLOYEE BENEFIT PLAN	'
	EMPLOYEE BENEFIT PLAN
	The 401(k) tax-deferred savings plan (the “401(k) Plan”) permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code of 1986, as amended. Under the 401(k) Plan, participating employees may defer a portion of their pre-tax earnings, up to the annual contribution limit specified by the Internal Revenue Service (“IRS”). In Canada, we have a Group Registered Retirement Savings Plan program (the “RRSP”) which permits participants to make tax deductible contributions up to the maximum contribution limits under the Income Tax Act. Our matching contributions to the 401(k) Plan and RRSP were $0.6 million and $0.4 million for the three months ended September 30, 2013 and September 30, 2012, respectively. Our matching contributions to the 401(k) Plan and RRSP were $1.6 million and $1.4 million for the nine months ended September 30, 2013 and September 30, 2012, respectively.

Segment_and_Significant_Custom

Segment and Significant Customer Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
SEGMENT AND SIGNIFICANT CUSTOMER INFORMATION	'
	SEGMENT AND SIGNIFICANT CUSTOMER INFORMATION
	The following tables set forth revenue and property and equipment by geographic region ($ amounts in 000’s):
		Three Months Ended		Nine Months Ended
	Revenue	September 30,	September 30,	September 30,	September 30,
		2013	2012	2013	2012
	Americas:
	United States	40,654	38,674	114,257	103,983
	Other Americas	24,794	18,543	63,844	51,587
	Total Americas	65,448	57,217	178,101	155,570
	Europe, Middle East and Africa (“EMEA”)	51,373	45,566	149,500	130,116
	Asia Pacific and Japan (“APAC”)	37,878	33,485	110,346	96,791
	Total revenue	154,699	136,268	437,947	382,477
	During each of the three and nine months ended September 30, 2013, Exclusive Networks Group accounted for 11% of total revenue. During the three and nine months ended September 30, 2012, Exclusive Networks Group accounted for 10% and 11% of total revenue, respectively. No other customers accounted for more than 10% of our total revenue during the three and nine months ended September 30, 2013 and 2012.
	Property and Equipment —Net	September 30,	December 31,
		2013	2012
	Americas:
	United States	21,288	18,764
	Canada	3,924	4,376
	Other Americas	61	87
	Total Americas	25,273	23,227
	EMEA	1,459	1,213
	APAC	1,648	1,198
	Total property and equipment—net	28,380	25,638

Foreign_Currency_Derivatives

Foreign Currency Derivatives	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
FOREIGN CURRENCY DERIVATIVES	'
	FOREIGN CURRENCY DERIVATIVES
	The notional amounts of forward exchange contracts to hedge balance sheet accounts as of September 30, 2013 and December 31, 2012 were ($ amounts in 000’s):
		Buy/Sell	Notional
	Balance Sheet Contracts:
	Currency - As of September 30, 2013
	Canadian dollar	Buy	25,367
	Currency - As of December 31, 2012
	Canadian dollar	Buy	17,968

Business_Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
BUSINESS COMBINATIONS	'
	BUSINESS COMBINATIONS
	Xtera
	On September 13, 2013, we acquired certain assets of Xtera Communications, Inc. (“Xtera”), including certain load balancing products 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 payment in cash is contingent upon attainment of revenue milestones. This acquisition will enable us to enhance our load balancing solutions in our product portfolio.
	We accounted for this acquisition as a purchase of a business and, accordingly, the total purchase price was allocated to the identifiable tangible 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.
	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 $0.1 million payable upon attainment of revenue milestones.
	The following table summarizes the fair value of assets acquired and liabilities assumed as of the acquisition date ($ amounts in 000’s):
	Current assets	459
	Finite-lived intangible assets	1,525
	Total assets acquired	1,984
	Current liabilities	234
	Total liabilities assumed	234
	Total purchase price	1,750
	Identified finite-lived intangible assets consist of developed technology that will be amortized as cost of revenue, ratably on a straight-line basis over an estimated useful life of 3 years. Pro-forma results of operations have not been presented because the acquisitions, individually and collectively, were not material to our results of operations.
	Coyote Point Systems
	On March 21, 2013, we acquired all of the outstanding equity securities of Coyote Point Systems, Inc. (“Coyote”), a provider of application delivery, load balancing and acceleration solutions, for $6.0 million in cash. The acquisition also includes 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 are met within two years of the acquisition date. Of the maximum $5.5 million in contingent earn-out payments, up to $3.5 million will be payable after eighteen months from the acquisition date, and up to $2.0 million will be payable after two years from the acquisition date. As the future earn-out payments are also contingent upon one of Coyote's former stockholder's employment during the earn-out period, these contingent obligations are being recorded as compensation expense ratably over the earn-out periods.
	We accounted for this acquisition as a purchase of a business and, accordingly, the total purchase price was allocated to Coyote’s identifiable tangible and intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The fair value assigned to the intangible assets acquired was determined using the income approach which discounts expected cash flows to present value using our estimates and assumptions.
	The following table summarizes the fair value of assets acquired and liabilities assumed as of the acquisition date ($ amounts in 000’s):
	Cash and cash equivalents	206
	Other current assets	501
	Finite-lived intangible assets	2,800
	Indefinite-lived intangible assets	2,600
	Goodwill	2,766
	Other assets	88
	Total assets acquired	8,961
	Current liabilities	1,078
	Long-term liabilities	1,898
	Total liabilities assumed	2,976
	Total purchase price	5,985
	Of the total acquired identified 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. Identified finite-lived intangible assets consist of developed technology and customer relationships that are being amortized as cost of revenue and sales and marketing expense, respectively, ratably on a straight-line basis, each over an estimated useful life of 6 years. Identified indefinite-lived intangible assets consisted of acquired IPR&D relating to existing research and development projects at the time of acquisition. 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. We paid this premium for a number of reasons, primarily for acquiring 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. 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 revenue ratably on a straight-line basis over an estimated useful life of 6 years.
	XDN
	On December 7, 2012, we completed the acquisition of XDN, Inc., a provider of cloud-based content delivery solutions, for a total consideration of $0.5 million. We accounted for this acquisition as a purchase of a business and, accordingly, the total purchase price was allocated to identifiable intangible assets acquired based on their estimated fair market value as of the acquisition date. The purchase price allocation resulted in purchased identifiable intangible assets of $0.5 million. Identifiable intangible assets consist of developed technology. The fair value assigned to identifiable intangible assets acquired was determined using the market approach, which compares the value of the purchased assets to similar assets in similar lines of business. These purchased identifiable intangible assets are being amortized as cost of revenue ratably over three years. The financial results of this acquisition were considered immaterial for purposes of pro forma financial disclosures.
	IntruGuard
	On March 8, 2012, we completed the acquisition of IntruGuard Devices, Inc. (“IntruGuard”), a supplier of Distributed Denial of Services ("DDoS"), prevention products, for a total consideration of $1.0 million. Of the total consideration, $0.4 million was withheld in escrow as security for IntruGuard’s indemnification obligations. We accounted for this acquisition as a purchase of a business and, accordingly, the total purchase price was allocated to tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair market values as of the acquisition date. The purchase price allocation resulted in purchased tangible assets of $53,000 and liabilities of $43,000, and purchased identifiable intangible assets of $0.9 million. Identifiable intangible assets consist of purchased technology. The fair value assigned to identifiable intangible assets acquired was determined using the income approach, which discounts expected future cash flows to present value using estimates and assumptions determined by us. Purchased identifiable intangible assets are being amortized as cost of revenue ratably over three years. Of the $0.4 million previously withheld in escrow, $0.2 million and $0.2 million were released to the selling stockholders during the three months ended September 30, 2012 and the three months ended March 31, 2013, respectively. The financial results of this acquisition were considered immaterial for purposes of pro forma financial disclosures.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets—Net	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
GOODWILL AND OTHER INTANGIBLE ASSETS—NET	'
	GOODWILL AND OTHER INTANGIBLE ASSETS—NET
	Goodwill
	We recorded $2.8 million of goodwill based on the purchase price allocation of the acquisition of Coyote during the nine months ended September 30, 2013. There were no impairments to goodwill during the three and nine months ended September 30, 2013.
	Other Intangible Assets—Net
	The following tables present other intangible assets ($ amounts in 000’s):
		September 30, 2013
		Gross	Accumulated Amortization	Net
	Finite-lived other intangible assets:
	Developed technology (1)	9,909	2,520	7,389
	Customer relationships	500	43	457
	Total other intangible assets	10,409	2,563	7,846
	(1) This amount includes the completed IPR&D acquired from Coyote of $2.6 million. During the three months ended September 30, 2013, we completed the associated IPR&D projects and transferred the IPR&D to developed technology. We started amortizing this developed technology as cost of revenue ratably on a straight-line basis over an estimated useful life of 6 years.
		December 31, 2012
		Gross	Accumulated Amortization	Net
	Finite-lived other intangible assets:
	Developed technology	3,541	1,424	2,117
	Total other intangible assets	3,541	1,424	2,117
	Amortization expense was $0.4 million and $0.3 million for the three months ended September 30, 2013 and September 30, 2012, respectively. Amortization expense was $1.1 million and $0.7 million for the nine months ended September 30, 2013 and September 30, 2012, respectively. The following table summarizes estimated future amortization expense of other intangible assets with finite lives for future fiscal years ($ amounts in 000’s):
		Amount
	Fiscal Years:
	2013 (remainder)	615
	2014	2,095
	2015	1,679
	2016	1,287
	2017	900
	Thereafter	1,270
	Total	7,846

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
ACCUMULATED OTHER COMPREHENSIVE INCOME	'
	ACCUMULATED OTHER COMPREHENSIVE INCOME
	The following table summarizes the changes in accumulated balances of other comprehensive income for the nine months ended September 30, 2013 ($ amounts in 000's):
		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	1,948			1,758		(615	)	3,091
	Other comprehensive income before reclassifications	(901	)		(819	)	287		(1,433	)
	Amounts reclassified from accumulated other comprehensive income	—			(8	)	3		(5	)
	Net current-period other comprehensive income	(901	)		(827	)	290		(1,438	)
	Ending balance	1,047			931		(325	)	1,653
	The following table provides details about the reclassification out of accumulated other comprehensive income for the nine months ended September 30, 2013 ($ amounts in 000s):
	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		(8	)		Other expense, net
	Tax provision related to items of other comprehensive income or loss		3			Provision for income taxes
	Total reclassification for the period		(5	)

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Presentation and Preparation of Consolidated Financial Statements [Policy Text Block]	'
	Basis of Presentation and Preparation
	The unaudited condensed consolidated financial statements of Fortinet, Inc. and its wholly owned subsidiaries (collectively, “we,” “us,” or “our”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information as well as the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements, and should be read in conjunction with our audited consolidated financial statements as of and for the fiscal year ended December 31, 2012, contained in our Annual Report on Form 10-K (“Form 10-K”) filed with the SEC on February 27, 2013. In the opinion of management, all adjustments, which only includes normal recurring adjustments, considered necessary for a fair presentation have been included. All intercompany balances, transactions and cash flows have been eliminated. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the operating results for any subsequent quarter, for the full year or for any future periods. The condensed consolidated balance sheets as of December 31, 2012 are derived from the audited consolidated financial statements for the year ended December 31, 2012.
	The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates.
	During the three and nine months ended September 30, 2013, we recorded a non-recurring out-of-period adjustment of $3.0 million to correct the presentation on our condensed consolidated balance sheets relating to our repurchase of 1,409,264 shares during the fiscal year ended December 31, 2009. This reclassification adjustment resulted in a decrease to the outstanding treasury stock balance and a corresponding decrease to additional paid-in capital. We believe the impact of the adjustment is not material to the current or prior fiscal periods. The shares that we repurchased in 2009 were retired immediately after repurchase. There was no outstanding treasury stock balance at September 30, 2013.
	There have been no material changes in our significant accounting policies as of and for the three and nine months ended September 30, 2013, as compared to the significant accounting policies described in the Form 10-K, except for the inclusion of policies related to goodwill and other indefinite-lived assets, long-term investments, and stock-based compensation expense pertaining to performance stock units (“PSUs”).
	Goodwill and other indefinite-lived intangible assets
	Goodwill represents the excess of purchase consideration over the estimated fair value of net assets of businesses acquired in a business combination. Goodwill and other indefinite-lived intangible assets such as in-process research and development 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 September 30, 2013, 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 does not exceed 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.
	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 and other intangible assets for impairment between annual tests in the presence of impairment indicators. Acquired in-process research and development assets are classified as indefinite-lived intangible assets until the successful completion or abandonment of the associated research and development efforts. Upon successful completion of the associated research and development efforts, the useful life of the asset is determined and the asset is amortized over its useful life. If the associated research and development efforts are abandoned, an impairment loss is recognized for the carrying value of the related asset.
	Long-term 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 Long-term investments 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. As of September 30, 2013, we only have one investment of $2.0 million in a privately-held company accounted for under the cost method.
	Stock-Based Compensation Expense - Performance Stock Units
	PSUs are restricted stock units (“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 grant date and is based on the market price of our common stock on the grant date 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.
	Certain prior period amounts have been combined on the condensed consolidated balance sheets and statements of cash flows to conform to the current period presentation.
Goodwill and other indefinite-lived intangible assets	'
	Goodwill and other indefinite-lived intangible assets
	Goodwill represents the excess of purchase consideration over the estimated fair value of net assets of businesses acquired in a business combination. Goodwill and other indefinite-lived intangible assets such as in-process research and development 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 September 30, 2013, 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 does not exceed 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.
	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 and other intangible assets for impairment between annual tests in the presence of impairment indicators. Acquired in-process research and development assets are classified as indefinite-lived intangible assets until the successful completion or abandonment of the associated research and development efforts. Upon successful completion of the associated research and development efforts, the useful life of the asset is determined and the asset is amortized over its useful life. If the associated research and development efforts are abandoned, an impairment loss is recognized for the carrying value of the related asset.
Long-term investments	'
	Long-term 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 Long-term investments 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. As of September 30, 2013, we only have one investment of $2.0 million in a privately-held company accounted for under the cost method.
Stock-Based Compensation Expense - Performance Stock Units	'
	Stock-Based Compensation Expense - Performance Stock Units
	PSUs are restricted stock units (“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 grant date and is based on the market price of our common stock on the grant date 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.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2013-02, Comprehensive Income (Topic 220)—Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income. For other amounts that are not required under GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under GAAP that provide additional detail about those amounts. We adopted ASU 2013-02 on January 1, 2013, and presented the effects within Note 16, Accumulated Other Comprehensive Income.
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740)-Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 provides guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, similar tax loss, or tax credit carryforward exists. This new standard requires the netting of unrecognized tax benefits (“UTBs”) against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. UTBs will be netted against all available same-jurisdiction loss or other tax carryforwards that would be utilized, rather than only against carryforwards that are created by the UTBs. ASU 2013-11 will be effective for us beginning in the first quarter of fiscal 2014. Early adoption is permitted. Since ASU 2013-11 only impacts financial statement disclosure requirements for unrecognized tax benefits, we do not expect its adoption to have an impact on our financial position or results of operations.

Financial_Instruments_and_Fair1

Financial Instruments and Fair Value (Tables)	9 Months Ended
	Sep. 30, 2013
Financial Instruments and Fair Value [Abstract]	'
Summary of Investments [Table Text Block]	'
	The following table summarizes our investments ($ amounts in 000’s):
		September 30, 2013
		Amortized	Unrealized		Unrealized		Fair
		Cost	Gains		Losses		Value
	U.S. government and agency securities	2,000	—		—		2,000
	Corporate debt securities	566,962	1,336		(441	)	567,857
	Commercial paper	81,955	13		(6	)	81,962
	Municipal bonds	34,554	44		(14	)	34,584
	Certificates of deposit and term deposits	8,053	3		—		8,056
	Total available-for-sale securities	693,524	1,396		(461	)	694,459
		December 31, 2012
		Amortized	Unrealized		Unrealized		Fair
		Cost	Gains		Losses		Value
	Corporate debt securities	529,738	1,814		(161	)	531,391
	Commercial paper	39,229	22		(6	)	39,245
	Municipal bonds	36,787	83		—		36,870
	Certificates of deposit and term deposits	9,099	6		—		9,105
	Total available-for-sale securities	614,853	1,925		(167	)	616,611
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, as of September 30, 2013 ($ amounts in 000’s):
		Less Than 12 Months			12 Months or Greater				Total
		Fair	Unrealized		Fair		Unrealized		Fair	Unrealized
		Value	Losses		Value		Losses		Value	Losses
	Corporate debt securities	232,721	(434	)	5,309		(7	)	238,030	(441	)
	Commercial paper	20,076	(6	)	—		—		20,076	(6	)
	Municipal bonds	12,941	(14	)	—		—		12,941	(14	)
	Total available-for-sale securities	265,738	(454	)	5,309		(7	)	271,047	(461	)
	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, as of December 31, 2012 ($ amounts in 000’s):
		Less Than 12 Months			12 Months or Greater				Total
		Fair	Unrealized		Fair		Unrealized		Fair	Unrealized
		Value	Losses		Value		Losses		Value	Losses
	Corporate debt securities	133,006	(156	)	5,010		(5	)	138,016	(161	)
	Commercial paper	8,464	(6	)	—		—		8,464	(6	)
	Total available-for-sale securities	141,470	(162	)	5,010		(5	)	146,480	(167	)
Investments Classified by Contractual Maturity Date [Table Text Block]	'
	The contractual maturities of our investments were as follows ($ amounts in 000’s)
		September 30,	December 31,
		2013	2012
	Due within one year	368,472	290,719
	Due within one to three years	325,987	325,892
	Total available-for-sale securities	694,459	616,611
Fair Value, by Balance Sheet Grouping and Measurement Inputs, Disclosure [Table Text Block]	'
	The following table presents the fair value of our financial assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 ($ amounts in 000’s):
		September 30, 2013					December 31, 2012
		Aggregate	Quoted		Significant		Aggregate		Quoted	Significant
		Fair	Prices in		Other		Fair		Prices in	Other
		Value	Active		Observable		Value		Active	Observable
			Markets For		Remaining				Markets For	Remaining
			Identical		Inputs				Identical	Inputs
			Assets						Assets
			(Level 1)		(Level 2)				(Level 1)	(Level 2)
	U.S. government and agency securities	2,000	—		2,000		—		—	—
	Corporate debt securities	574,578	—		574,578		531,391		—	531,391
	Commercial paper	83,262	—		83,262		41,994		—	41,994
	Municipal bonds	34,584	—		34,584		36,870		—	36,870
	Certificates of deposit and term deposits	8,056	—		8,056		9,105		—	9,105
	Money market funds	45,897	45,897		—		39,871		39,871	—
		748,377	45,897		702,480		659,231		39,871	619,360
	Reported as:
	Cash equivalents	53,918					42,620
	Short-term investments	368,472					290,719
	Long-term investments	325,987					325,892
	Total	748,377					659,231

Inventory_Tables

Inventory (Tables)	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Inventory [Table Text Block]	'
	Inventory consisted of the following ($ amounts in 000’s):
		September 30,	December 31,
		2013	2012
	Raw materials	7,765	4,958
	Finished goods	39,111	16,102
	Inventory	46,876	21,060

Property_and_EquipmentNet_Tabl

Property and Equipment—Net (Tables)	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	Property and equipment consisted of the following ($ amounts in 000’s):
		September 30,		December 31,
		2013		2012
	Land	13,895		13,895
	Building and building improvements	610		610
	Evaluation units	21,986		18,322
	Computer equipment and software	22,785		17,176
	Furniture and fixtures	1,709		1,501
	Construction-in-process	1,295		—
	Leasehold improvements and tooling	5,532		5,354
	Total property and equipment	67,812		56,858
	Less: accumulated depreciation	(39,432	)	(31,220	)
	Property and equipment—net	28,380		25,638

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
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 ($ and share amounts in 000’s, except per share amounts):
		Three Months Ended		Nine Months Ended
		September 30,	September 30,	September 30,	September 30,
		2013	2012	2013	2012
	Numerator:
	Net income	11,029	17,206	32,257	45,329
	Denominator:
	Basic shares:
	Weighted-average common stock outstanding-basic	162,906	158,751	162,150	157,416
	Diluted shares:
	Weighted-average common stock outstanding-basic	162,906	158,751	162,150	157,416
	Effect of potentially dilutive securities:
	Stock options	5,525	8,019	5,844	8,694
	RSUs	213	—	50	—
	ESPP	22	21	10	17
	Weighted-average shares used to compute diluted net income per share	168,666	166,791	168,054	166,127
	Net income per share:
	Basic	0.07	0.11	0.2	0.29
	Diluted	0.07	0.1	0.19	0.27
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 000’s):
		Three Months Ended		Nine Months Ended
		September 30,	September 30,	September 30,	September 30,
		2013	2012	2013	2012
	Stock options	6,640	5,686	7,364	6,847
	RSUs	1,416	388	2,383	130
	ESPP	407	303	399	300
		8,463	6,377	10,146	7,277

Deferred_Revenue_Tables

Deferred Revenue (Tables)	9 Months Ended
	Sep. 30, 2013
Deferred Revenue Disclosure [Abstract]	'
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]	'
	Deferred revenue consisted of the following ($ amounts in 000’s):
		September 30,	December 31,
		2013	2012
	Product	5,114	5,411
	Services	389,571	348,548
	Ratable and other revenue	5,488	9,226
	Total deferred revenue	400,173	363,185
	Reported As:
	Current	271,302	247,268
	Non-current	128,871	115,917
	Total deferred revenue	400,173	363,185

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	The aggregate future non-cancelable minimum rental payments on operating leases as of September 30, 2013 are as follows ($ amounts in 000’s):
		Rental
		Payment
	Fiscal Years:
	2013 (remainder)	2,675
	2014	7,715
	2015	5,342
	2016	4,279
	2017	3,738
	Thereafter	7,779
	Total	31,528
Schedule of Product Warranty Liability [Table Text Block]	'
	Accrued warranty activities are summarized as follows ($ amounts in 000’s):
		For The Nine Months Ended
		September 30,		September 30,
		2013		2012
	Accrued warranty balance—beginning of the period	2,309		2,582
	Warranty costs incurred	(2,670	)	(1,843	)
	Provision for warranty, including warranty assumed from Xtera	3,134		1,604
	Changes in prior period estimates	274		(307	)
	Accrued warranty balance—end of the period	3,047		2,036

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
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:
		Three Months Ended			Nine Months Ended
		September 30,			September 30,		September 30,
		2013			2013		2012
	Expected term in years	4.6			4.6		4.6
	Volatility (%)	47.8			47.8		46.4 - 51.9
	Risk-free interest rate (%)	1.2			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 000’s, except per share amounts, exercise prices and contractual life):
		Options Outstanding
		Number			Weighted-		Weighted-		Aggregate
		of Shares			Average		Average		Intrinsic
					Exercise		Remaining		Value ($)
					Price ($)		Contractual
							Life (Years)
	Balance—December 31, 2012	18,571			12.4
	Granted	209			21.11
	Forfeited	(631	)		21.82
	Exercised	(2,210	)		5.33
	Balance—September 30, 2013	15,939			13.12		3.5		134,415
	Options vested and expected to vest—September 30, 2013	15,914			13.11		3.5		134,407
	Options exercisable—September 30, 2013	11,781			9.98		3.1		129,937
	Additional information related to our stock options is summarized below ($ amounts in 000’s, except per share amounts):
		Three Months Ended					Nine Months Ended
		30-Sep-13			30-Sep-12		30-Sep-13			30-Sep-12
	Weighted-average fair value per share granted	8.61			—		8.61			11.13
	Intrinsic value of options exercised	7,880			32,623		36,997			83,313
	Fair value of options vested	5,063			6,823		21,553			19,897
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 period presented below (in 000’s, except per share amounts):
		Restricted Stock Units Outstanding
		Number of Shares			Weighted-Average Grant-Date Fair Value per Share ($)
	Balance—December 31, 2012	830			23.73
	Granted	3,871			21.86
	Forfeited	(251	)		22.97
	Vested	(144	)		24.86
	Balance—September 30, 2013	4,306			21.98
	RSUs expected to vest—September 30, 2013	3,988			22.01
Schedule of Share-based Compensation, Shares Withheld for Taxes [Table Text Block]	'
	The following summarizes the number and value of the shares withheld for employee taxes for the three and nine months ended September 30, 2013 ($ amount in 000’s, except share amount):
	Shares withheld for taxes	45
	Amount withheld for taxes	966
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 for the three and nine months ended September 30, 2013:
	Expected term in years	2.97
	Volatility (%)	50.11
	Risk-free interest rate (%)	0.67
	Dividend rate (%)	—
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	'
	In determining the fair value of the shares subject to our ESPP, we use the Black-Scholes option pricing model that employs the following weighted-average assumptions:
		Three Months Ended				Nine Months Ended
		September 30, 2013		September 30, 2012		30-Sep-13		30-Sep-12
	Expected term in years	0.5		0.5		0.5		0.5
	Volatility (%)	35.1		43.1		44		53.7
	Risk-free interest rate (%)	0.1		0.2		0.1		0.1
	Dividend rate (%)	—		—		—		—
	Additional information related to our ESPP is provided below (in 000’s, except per share amounts):
		Three Months Ended					Nine Months Ended
		September 30, 2013			September 30, 2012		30-Sep-13			30-Sep-12
	Weighted-average fair value per share granted ($)	5.04			6.63		6.11			7.06
	Shares issued under the ESPP	343,761			288,884		672,397			576,833
	Weighted-average price per share issued ($)	17.9			20.29		18.88			18.9
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 ($ amounts in 000’s):
		Three Months Ended					Nine Months Ended
		September 30,			September 30,		September 30,			September 30,
		2013			2012		2013			2012
	Cost of product revenue	91			85		277			237
	Cost of services revenue	1,297			1,018		3,543			2,704
	Research and development	3,548			2,525		9,605			6,774
	Sales and marketing	5,215			3,879		13,927			10,797
	General and administrative	1,627			1,323		4,432			3,416
	Total stock-based compensation expense	11,778			8,830		31,784			23,928
	The following table summarizes stock-based compensation expense by award type ($ amounts in 000’s)
		Three Months Ended					Nine Months Ended
		September 30,			September 30,		September 30,			September 30,
		2013			2012		2013			2012
	Stock options	5,180			6,985		15,801			19,982
	RSUs	5,408			576		12,439			576
	ESPP	1,190			1,269		3,544			3,370
	Total stock-based compensation expense	11,778			8,830		31,784			23,928
Income Tax Benefit from Stock Option Plans [Table Text Block]	'
	Total income tax benefit from employee stock option plans that is recognized in the consolidated statements of operations is as follows ($ amounts in 000’s):
		Three Months Ended					Nine Months Ended
		September 30,			September 30,		September 30,			September 30,
		2013			2012		2013			2012
	Income tax benefit from employee stock option plans	3,176			6,685		9,557			17,073

Segment_and_Significant_Custom1

Segment and Significant Customer Information (Tables)	9 Months Ended
	Sep. 30, 2013
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 ($ amounts in 000’s):
		Three Months Ended		Nine Months Ended
	Revenue	September 30,	September 30,	September 30,	September 30,
		2013	2012	2013	2012
	Americas:
	United States	40,654	38,674	114,257	103,983
	Other Americas	24,794	18,543	63,844	51,587
	Total Americas	65,448	57,217	178,101	155,570
	Europe, Middle East and Africa (“EMEA”)	51,373	45,566	149,500	130,116
	Asia Pacific and Japan (“APAC”)	37,878	33,485	110,346	96,791
	Total revenue	154,699	136,268	437,947	382,477
	During each of the three and nine months ended September 30, 2013, Exclusive Networks Group accounted for 11% of total revenue. During the three and nine months ended September 30, 2012, Exclusive Networks Group accounted for 10% and 11% of total revenue, respectively. No other customers accounted for more than 10% of our total revenue during the three and nine months ended September 30, 2013 and 2012.
	Property and Equipment —Net	September 30,	December 31,
		2013	2012
	Americas:
	United States	21,288	18,764
	Canada	3,924	4,376
	Other Americas	61	87
	Total Americas	25,273	23,227
	EMEA	1,459	1,213
	APAC	1,648	1,198
	Total property and equipment—net	28,380	25,638

Foreign_Currency_Derivatives_T

Foreign Currency Derivatives (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	'
	The notional amounts of forward exchange contracts to hedge balance sheet accounts as of September 30, 2013 and December 31, 2012 were ($ amounts in 000’s):
		Buy/Sell	Notional
	Balance Sheet Contracts:
	Currency - As of September 30, 2013
	Canadian dollar	Buy	25,367
	Currency - As of December 31, 2012
	Canadian dollar	Buy	17,968

Business_Combinations_Purchase

Business Combinations Purchase Price Allocation (Tables)	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Schedule of Purchase Price Allocation [Table Text Block]	'
	The following table summarizes the fair value of assets acquired and liabilities assumed as of the acquisition date ($ amounts in 000’s):
	Cash and cash equivalents	206
	Other current assets	501
	Finite-lived intangible assets	2,800
	Indefinite-lived intangible assets	2,600
	Goodwill	2,766
	Other assets	88
	Total assets acquired	8,961
	Current liabilities	1,078
	Long-term liabilities	1,898
	Total liabilities assumed	2,976
	Total purchase price	5,985
	The following table summarizes the fair value of assets acquired and liabilities assumed as of the acquisition date ($ amounts in 000’s):
	Current assets	459
	Finite-lived intangible assets	1,525
	Total assets acquired	1,984
	Current liabilities	234
	Total liabilities assumed	234
	Total purchase price	1,750

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets—Net (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Other Intangible Assets Major Class [Table Text Block]	'
	The following tables present other intangible assets ($ amounts in 000’s):
		September 30, 2013
		Gross	Accumulated Amortization	Net
	Finite-lived other intangible assets:
	Developed technology (1)	9,909	2,520	7,389
	Customer relationships	500	43	457
	Total other intangible assets	10,409	2,563	7,846
	(1) This amount includes the completed IPR&D acquired from Coyote of $2.6 million. During the three months ended September 30, 2013, we completed the associated IPR&D projects and transferred the IPR&D to developed technology. We started amortizing this developed technology as cost of revenue ratably on a straight-line basis over an estimated useful life of 6 years.
		December 31, 2012
		Gross	Accumulated Amortization	Net
	Finite-lived other intangible assets:
	Developed technology	3,541	1,424	2,117
	Total other intangible assets	3,541	1,424	2,117
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	The following table summarizes estimated future amortization expense of other intangible assets with finite lives for future fiscal years ($ amounts in 000’s):
		Amount
	Fiscal Years:
	2013 (remainder)	615
	2014	2,095
	2015	1,679
	2016	1,287
	2017	900
	Thereafter	1,270
	Total	7,846

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Schedule of Accumulated Other Comprehensive Income	'
	The following table summarizes the changes in accumulated balances of other comprehensive income for the nine months ended September 30, 2013 ($ amounts in 000's):
		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	1,948			1,758		(615	)	3,091
	Other comprehensive income before reclassifications	(901	)		(819	)	287		(1,433	)
	Amounts reclassified from accumulated other comprehensive income	—			(8	)	3		(5	)
	Net current-period other comprehensive income	(901	)		(827	)	290		(1,438	)
	Ending balance	1,047			931		(325	)	1,653
Reclassification out of Accumulated Other Comprehensive Income	'
	The following table provides details about the reclassification out of accumulated other comprehensive income for the nine months ended September 30, 2013 ($ amounts in 000s):
	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		(8	)		Other expense, net
	Tax provision related to items of other comprehensive income or loss		3			Provision for income taxes
	Total reclassification for the period		(5	)

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2009	Aug. 31, 2013
Accounting Policies [Abstract]	'	'	'	'
Reclassification adjustment, treasury stock to additional paid-in capital	$3	$3	'	'
Shares repurchased and retired	'	'	1,409,264	'
Cost method investments, original cost	$2	$2	'	$2
Performance Shares [Member] | Minimum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Award vesting period	'	'2 years	'	'
Performance Shares [Member] | Maximum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Award vesting period	'	'3 years	'	'

Investment_in_a_PrivatelyHeld_1

Investment in a Privately-Held Company (Details) (USD $)	Sep. 30, 2013	Aug. 31, 2013
In Millions, unless otherwise specified
Investments, All Other Investments [Abstract]	'	'
Cost method investments, original cost	$2	$2

Financial_Instruments_and_Fair2

Financial Instruments and Fair Value , Investments (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale, Amortized Cost	$693,524	$614,853
Available-for-Sale, Unrealized Gains	1,396	1,925
Available-for-Sale, Unrealized Losses	-461	-167
Fair Value	694,459	616,611
U.S. government and agency securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale, Amortized Cost	2,000	'
Available-for-Sale, Unrealized Gains	0	'
Available-for-Sale, Unrealized Losses	0	'
Fair Value	2,000	'
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale, Amortized Cost	566,962	529,738
Available-for-Sale, Unrealized Gains	1,336	1,814
Available-for-Sale, Unrealized Losses	-441	-161
Fair Value	567,857	531,391
Commercial paper [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale, Amortized Cost	81,955	39,229
Available-for-Sale, Unrealized Gains	13	22
Available-for-Sale, Unrealized Losses	-6	-6
Fair Value	81,962	39,245
Municipal bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale, Amortized Cost	34,554	36,787
Available-for-Sale, Unrealized Gains	44	83
Available-for-Sale, Unrealized Losses	-14	0
Fair Value	34,584	36,870
Certificates of deposit and term deposits [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale, Amortized Cost	8,053	9,099
Available-for-Sale, Unrealized Gains	3	6
Available-for-Sale, Unrealized Losses	0	0
Fair Value	$8,056	$9,105

Financial_Instruments_and_Fair3

Financial Instruments and Fair Value , Gross Unrealized Losses, Fair Value (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months, Fair Value	$265,738	$141,470
Less Than 12 Months, Unrealized Losses	-454	-162
12 Months or Greater, Fair Value	5,309	5,010
12 Months or Greater, Unrealized Losses	-7	-5
Total, Fair Value	271,047	146,480
Total, Unrealized Losses	461	167
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months, Fair Value	232,721	133,006
Less Than 12 Months, Unrealized Losses	-434	-156
12 Months or Greater, Fair Value	5,309	5,010
12 Months or Greater, Unrealized Losses	-7	-5
Total, Fair Value	238,030	138,016
Total, Unrealized Losses	441	161
Commercial paper [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months, Fair Value	20,076	8,464
Less Than 12 Months, Unrealized Losses	-6	-6
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	20,076	8,464
Total, Unrealized Losses	6	6
Municipal bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months, Fair Value	12,941	'
Less Than 12 Months, Unrealized Losses	-14	'
12 Months or Greater, Fair Value	0	'
12 Months or Greater, Unrealized Losses	0	'
Total, Fair Value	12,941	'
Total, Unrealized Losses	$14	'

Financial_Instruments_and_Fair4

Financial Instruments and Fair Value , Contractual Maturities of Investments (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial Instruments and Fair Value [Abstract]	'	'
Due within one year	$368,472	$290,719
Due within one to three years	325,987	325,892
Fair Value	$694,459	$616,611

Financial_Instruments_and_Fair5

Financial Instruments and Fair Value , Fair Value Measurements (Details) (Recurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Estimate of Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total Assets, Fair Value Disclosure	$748,377	$659,231
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	45,897	39,871
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	702,480	619,360
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	2,000	0
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	0	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	2,000	0
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	574,578	531,391
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	574,578	531,391
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	83,262	41,994
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	83,262	41,994
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	34,584	36,870
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	34,584	36,870
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	8,056	9,105
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	8,056	9,105
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	45,897	39,871
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	45,897	39,871
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	748,377	659,231
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	53,918	42,620
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	368,472	290,719
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	$325,987	$325,892

Inventory_Details

Inventory (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory, Net [Abstract]	'	'
Raw materials	$7,765	$4,958
Finished goods	39,111	16,102
Inventory	$46,876	$21,060

Property_and_EquipmentNet_Deta

Property and Equipment—Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	$67,812,000	'	$67,812,000	'	$56,858,000
Less: accumulated depreciation	-39,432,000	'	-39,432,000	'	-31,220,000
Property and equipment - net	28,380,000	'	28,380,000	'	25,638,000
Depreciation expense	3,800,000	2,700,000	10,400,000	7,200,000	'
Land [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	13,895,000	'	13,895,000	'	13,895,000
Building and building improvements [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	610,000	'	610,000	'	610,000
Evaluation units [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	21,986,000	'	21,986,000	'	18,322,000
Computer equipment and software [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	22,785,000	'	22,785,000	'	17,176,000
Furniture and fixtures [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	1,709,000	'	1,709,000	'	1,501,000
Construction in-progress [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	1,295,000	'	1,295,000	'	0
Leasehold improvements and tooling [Member]	'	'	'	'	'
Property, Plant and Equipment, Net, by Type [Abstract]	'	'	'	'	'
Total property and equipment	$5,532,000	'	$5,532,000	'	$5,354,000

Net_Income_Per_Share_Calculati

Net Income Per Share , Calculation of Basic and Diluted (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Line Items]	'	'	'	'
Net income	$11,029	$17,206	$32,257	$45,329
Basic shares:	'	'	'	'
Weighted-average common shares outstanding-basic (in shares)	162,906	158,751	162,150	157,416
Diluted shares:	'	'	'	'
Weighted-average common shares outstanding-basic (in shares)	162,906	158,751	162,150	157,416
Effect of potentially dilutive securities:	'	'	'	'
Weighted-average shares used to compute diluted net income per share (in shares)	168,666	166,791	168,054	166,127
Net income per share:	'	'	'	'
Basic (in dollars per share)	$0.07	$0.11	$0.20	$0.29
Diluted (in dollars per share)	$0.07	$0.10	$0.19	$0.27
Stock Options [Member]	'	'	'	'
Effect of potentially dilutive securities:	'	'	'	'
Employee stock options and purchase rights (in shares)	5,525	8,019	5,844	8,694
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Effect of potentially dilutive securities:	'	'	'	'
Employee stock options and purchase rights (in shares)	213	0	50	0
ESPP [Member]	'	'	'	'
Effect of potentially dilutive securities:	'	'	'	'
Employee stock options and purchase rights (in shares)	22	21	10	17

Net_Income_Per_Share_Anti_Dilu

Net Income Per Share , Anti Dilutive Securities (Details)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities (in shares)	8,463	6,377	10,146	7,277
Stock Options [Member] | Stock Compensation Plan [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities (in shares)	6,640	5,686	7,364	6,847
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)	1,416	388	2,383	130
ESPP [Member] | Stock Compensation Plan [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities (in shares)	407	303	399	300

Deferred_Revenue_Details

Deferred Revenue (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]	'	'
Short-term	$271,302	$247,268
Long-term	128,871	115,917
Total deferred revenue	400,173	363,185
Product [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Total deferred revenue	5,114	5,411
Services [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Total deferred revenue	389,571	348,548
Ratable and other revenue [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Total deferred revenue	$5,488	$9,226

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]	'	'	'	'
Accrued warranty balance—beginning of the period	'	'	$2,309,000	$2,582,000
Warranty costs incurred	'	'	2,670,000	1,843,000
Provision for warranty, including warranty assumed from Xtera	'	'	3,134,000	1,604,000
Changes in prior period estimates	'	'	274,000	-307,000
Accrued warranty balance—end of the period	3,047,000	2,036,000	3,047,000	2,036,000
Rent expense	$2,400,000	$2,100,000	$7,100,000	$6,500,000

Commitments_and_Contingencies_2

Commitments and Contingencies , Minimum Operating Lease Payments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]	'	'	'	'
Operating Leases, Rent Expense, Net	$2,400,000	$2,100,000	$7,100,000	$6,500,000
Fiscal Years:	'	'	'	'
2013 (remainder)	2,675,000	'	2,675,000	'
2014	7,715,000	'	7,715,000	'
2015	5,342,000	'	5,342,000	'
2016	4,279,000	'	4,279,000	'
2017	3,738,000	'	3,738,000	'
Thereafter	7,779,000	'	7,779,000	'
Total	$31,528,000	'	$31,528,000	'

Commitments_and_Contingencies_3

Commitments and Contingencies , Purchase Obligations (Details) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Independent Contract Manufacturing [Member]	'
Unrecorded Unconditional Purchase Obligation [Line Items]	'
Open purchase orders and other contractual obligations	$10.20
Other Purchase Obligations [Member]	'
Unrecorded Unconditional Purchase Obligation [Line Items]	'
Open purchase orders and other contractual obligations	$46.60

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	3 Months Ended		9 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'	'
Granted (in shares)	'	'	209	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]	'	'	'	'
Granted (in dollars per share)	'	'	$21.11	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]	'	'	'	'
Income tax benefit from employee stock option plans	$3,176,000	$6,685,000	$9,557,000	$17,073,000
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]	'	'	'	'
Expected term in years	'4 years 6 months 29 days	'	'4 years 6 months 29 days	'4 years 7 months 6 days
Volatility (%)	47.80%	'	47.80%	'
Volatility (%), minimum	'	'	'	46.40%
Volatility (%), maximum	'	'	'	51.90%
Risk-free interest rate (%)	1.20%	'	1.20%	'
Risk-free interest rate (%), minimum	'	'	'	0.70%
Risk-free interest rate (%), maximum	'	'	'	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)	'	'	18,571	'
Forfeited (in shares)	'	'	-631	'
Exercised (in shares)	'	'	-2,210	'
Balance - End (in shares)	15,939	'	15,939	'
Options vested and expected to vest (in shares)	15,914	'	15,914	'
Balance - Ending (in shares)	11,781	'	11,781	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]	'	'	'	'
Balance - Beginning (in dollars per share)	'	'	$12.40	'
Forfeited (in dollars per share)	'	'	$21.82	'
Exercised (in dollars per share)	'	'	$5.33	'
Balance - Ending (in dollars per share)	$13.12	'	$13.12	'
Options vested and expected to vest, Weighted average exercise price (in dollars per share)	$13.11	'	$13.11	'
Options exercisable, Weighted average exercise price (in dollars per share)	$9.98	'	$9.98	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]	'	'	'	'
Options outstanding, Weighted average remaining contractual life (in years)	'	'	'3 years 6 months 16 days	'
Options vested and expected to vest, Weighted average remaining contractual life (in years)	'	'	'3 years 6 months 16 days	'
Options exercisable, Weighted average remaining contractual life (in years)	'	'	'3 years 19 days	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	134,415,000	'	134,415,000	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	134,407,000	'	134,407,000	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	129,937,000	'	129,937,000	'
Compensation cost not yet recognized	$46,000,000	'	$46,000,000	'
Compensation cost not yet recognized period of recognition	'	'	'1 year 11 months 25 days	'

Stockholders_Equity_Additional

Stockholders' Equity , Additional information related to our stock options (Details) (Stock Options [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Options [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Compensation cost not yet recognized	$46,000,000	'	$46,000,000	'
Compensation cost not yet recognized period of recognition	'	'	'1 year 11 months 25 days	'
Weighted-average fair value per share granted	$8.61	$0	$8.61	$11.13
Intrinsic value of options exercised	7,880,000	32,623,000	36,997,000	83,313,000
Fair value of options vested	$5,063,000	$6,823,000	$21,553,000	$19,897,000

Stockholders_Equity_Restricted

Stockholders' Equity , Restricted Stock Units Activity (Details) (Restricted Stock Units (RSUs) [Member], USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013
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—December 31, 2012	830,000
Granted	3,871,000
Forfeited	-251,000
Vested	-144,000
Balance—September 30, 2013	4,306,000
RSUs expected to vest—September 30, 2013	3,988,000
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)—December 31, 2012	$23.73
Granted, weighted-average grant-date fair value per share (in dollars per share)	$21.86
Forfeited, weighted-average grant-date fair value per share (in dollars per share)	$22.97
Vested, weighted-average grant-date fair value per share (in dollars per share)	$24.86
Balance, weighted-average grant-date fair value per share (in dollars per share)—September 30, 2013	$21.98
RSUs expected to vest, weighted-average grant-date fair value per share (in dollars per share)—September 30, 2013	$22.01
Compensation cost not yet recognized	$86.30
Compensation cost not yet recognized period of recognition	'3 years 4 months 28 days

Stockholders_Equity_Shares_Wit

Stockholders' Equity , Shares Withheld for Taxes (Details) (USD $)	9 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
		Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares withheld for taxes	45	45
Amount withheld for taxes	$966	$966

Stockholders_Equity_Performanc

Stockholders' Equity , Performance Stock Units (Details) (Performance Shares [Member], USD $)	3 Months Ended	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Expected term in years	'2 years 11 months 19 days	'2 years 11 months 19 days
Volatility (%)	50.11%	50.11%
Risk-free interest rate (%)	0.67%	0.67%
Dividend rate (%)	0.00%	0.00%
Granted (in shares)	'	180,000
Weighted-average fair value per share granted (in dollars per share)	'	$22.06
Compensation cost not yet recognized	$3.80	$3.80
Compensation cost not yet recognized period of recognition	'	'2 years 10 months 2 days
Minimum [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Settlement range	'	0.00%
Maximum [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Settlement range	'	150.00%

Stockholders_Equity_ESPP_Infor

Stockholders' Equity , ESPP Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Shares issued under the ESPP (in shares)	0	0	'	'
Employee Stock Purchase Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expected term in years	'6 months	'6 months	'6 months	'6 months
Volatility (%)	35.10%	43.10%	44.00%	53.70%
Risk-free interest rate (%)	0.10%	0.20%	0.10%	0.10%
Dividend rate (%)	0.00%	0.00%	0.00%	0.00%
Weighted-average fair value per share granted (in dollars per share)	$5.04	$6.63	$6.11	$7.06
Shares issued under the ESPP (in shares)	343,761	288,884	672,397	576,833
Weighted-average price per share issued (in dollars per share)	$17.90	$20.29	$18.88	$18.90

Stockholders_Equity_Allocation

Stockholders' Equity , Allocation of Stock-Based Compensation Expense (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	$11,778	$8,830	$31,784	$23,928
Cost of product revenue [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	91	85	277	237
Cost of services revenue [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	1,297	1,018	3,543	2,704
Research and development [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	3,548	2,525	9,605	6,774
Selling and marketing [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	5,215	3,879	13,927	10,797
General and administrative [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	1,627	1,323	4,432	3,416
Stock Options [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	5,180	6,985	15,801	19,982
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	5,408	576	12,439	576
Employee Stock [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	$1,190	$1,269	$3,544	$3,370

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Contingency [Line Items]	'	'	'	'	'
Effective tax rate	40.00%	36.00%	36.00%	34.00%	'
Unrecognized tax benefits	$28.70	'	$28.70	'	$27.80
Unrecognized tax benefits which, if recognized, would favorably impact the effective tax rate	28.3	'	28.3	'	'
Accrued interest and penalties related to uncertain tax provisions	$2.30	'	$2.30	'	'

Employee_Benefit_Plan_Details

Employee Benefit Plan (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Benefit Plan [Abstract]	'	'	'	'
Matching contributions to the RRSP and 401(k) Plans	$0.60	$0.40	$1.60	$1.40

Segment_and_Significant_Custom2

Segment and Significant Customer Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]	'	'	'	'	'
Concentration risk, percentage	11.00%	10.00%	11.00%	11.00%	'
Revenue	$154,699	$136,268	$437,947	$382,477	'
Property and equipment - net	28,380	'	28,380	'	25,638
Americas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Revenue	65,448	57,217	178,101	155,570	'
Property and equipment - net	25,273	'	25,273	'	23,227
United States	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Revenue	40,654	38,674	114,257	103,983	'
Property and equipment - net	21,288	'	21,288	'	18,764
Canada [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Property and equipment - net	3,924	'	3,924	'	4,376
Other Americas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Revenue	24,794	18,543	63,844	51,587	'
Property and equipment - net	61	'	61	'	87
EMEA [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Revenue	51,373	45,566	149,500	130,116	'
Property and equipment - net	1,459	'	1,459	'	1,213
APAC [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Revenue	37,878	33,485	110,346	96,791	'
Property and equipment - net	$1,648	'	$1,648	'	$1,198

Foreign_Currency_Derivatives_D

Foreign Currency Derivatives (Details) (Canada, Dollars, USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Canada, Dollars	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount of Foreign Currency Derivative Purchase Contracts	$25,367	$17,968

Business_Combinations_Details

Business Combinations (Details) (USD $)

Sep. 30, 2013

Sep. 13, 2013

Mar. 21, 2013

Mar. 31, 2013

Sep. 30, 2013

Mar. 21, 2013

Sep. 30, 2013

Mar. 21, 2013

Dec. 07, 2012

Mar. 31, 2013

Sep. 30, 2012

Mar. 08, 2012

Mar. 21, 2013

Mar. 21, 2013

Mar. 21, 2013

Xtera [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

XDN, Inc [Member]

IntruGuard Devices, Inc [Member]

IntruGuard Devices, Inc [Member]

IntruGuard Devices, Inc [Member]

Contingent consideration payable after eighteen months [Member]

Contingent consideration payable after two years [Member]

In Process Research and Development [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Developed Technology [Member]

Developed Technology [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash payments to acquire business

'

$1,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Business acquisition, contingent consideration, at fair value

'

100,000

5,500,000

'

'

'

'

'

'

'

'

'

'

'

'

Purchased tangible assets

'

200,000

'

'

'

'

'

'

'

'

'

53,000

'

'

'

Purchased identifiable intangible assets

'

1,500,000

'

'

'

'

'

'

'

'

'

900,000

'

'

'

Liabilities assumed

'

100,000

'

'

'

'

'

'

'

'

'

43,000

'

'

'

Acquired finite-lived intangible assets, amount

'

'

'

'

500,000

500,000

'

2,300,000

'

'

'

'

'

'

'

In-process research and development

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,600,000

Finite-lived intangible asset, useful life

'

'

'

'6 years

'

'

'6 years

'

'

'

'

'

'

'

'

Goodwill

2,800,000

'

2,800,000

'

'

'

'

'

'

'

'

'

'

'

'

Total consideration

'

'

6,000,000

'

'

'

'

'

500,000

'

'

1,000,000

'

'

'

Amount withheld in escrow

'

'

'

'

'

'

'

'

'

'

'

400,000

'

'

'

Released amounts previously withheld in escrow

'

'

'

'

'

'

'

'

'

200,000

200,000

'

'

'

'

Potential cash payment

'

'

'

'

'

'

'

'

'

'

'

'

3,500,000

2,000,000

'

Current assets

'

459,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

'

'

206,000

'

'

'

'

'

'

'

'

'

'

'

'

Other current assets

'

'

501,000

'

'

'

'

'

'

'

'

'

'

'

'

Finite-lived intangible assets

'

1,525,000

2,800,000

'

'

'

'

'

500,000

'

'

'

'

'

'

Indefinite-lived intangible assets

'

'

2,600,000

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

'

'

2,766,000

'

'

'

'

'

'

'

'

'

'

'

'

Other assets

'

'

88,000

'

'

'

'

'

'

'

'

'

'

'

'

Total assets acquired

'

1,984,000

8,961,000

'

'

'

'

'

'

'

'

'

'

'

'

Current liabilities

'

234,000

1,078,000

'

'

'

'

'

'

'

'

'

'

'

'

Long-term liabilities

'

'

1,898,000

'

'

'

'

'

'

'

'

'

'

'

'

Total liabilities assumed

'

234,000

2,976,000

'

'

'

'

'

'

'

'

'

'

'

'

Total purchase price

'

$1,750,000

$5,985,000

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets—Net (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Mar. 21, 2013

Mar. 21, 2013

Sep. 30, 2013

Mar. 21, 2013

Mar. 21, 2013

Developed Technology [Member]

Developed Technology [Member]

Developed Technology [Member]

Developed Technology [Member]

Developed Technology [Member]

Customer Relationships [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Coyote Point Systems Inc [Member]

Developed Technology [Member]

Customer Relationships [Member]

Customer Relationships [Member]

In Process Research and Development [Member]

Finite-Lived Intangible Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

$2,800,000

'

'

'

'

'

'

'

$2,800,000

'

'

'

'

Finite-Lived Intangible Assets, Net [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

Finite-lived other intangible assets, gross

10,409,000

'

9,909,000

'

9,909,000

'

3,541,000

'

'

'

'

'

'

Customer relationships, gross

'

'

'

'

'

'

'

'

'

2,300,000

500,000

500,000

'

Accumulated amortization

2,563,000

1,424,000

2,520,000

'

2,520,000

'

1,424,000

43,000

'

'

'

'

'

In-process research and development

'

'

'

'

'

'

'

'

'

'

'

'

2,600,000

Total other intangible assets

'

3,541,000

'

'

'

'

'

'

'

'

'

'

'

Total other intangible assets, net

'

2,117,000

'

'

'

'

'

'

'

'

'

'

'

Amortization expense

'

'

400,000

300,000

1,100,000

700,000

'

'

'

'

'

'

'

2013 (remainder)

615,000

'

'

'

'

'

'

'

'

'

'

'

'

2014

2,095,000

'

'

'

'

'

'

'

'

'

'

'

'

2015

1,679,000

'

'

'

'

'

'

'

'

'

'

'

'

2016

1,287,000

'

'

'

'

'

'

'

'

'

'

'

'

2017

900,000

'

'

'

'

'

'

'

'

'

'

'

'

Thereafter

1,270,000

'

'

'

'

'

'

'

'

'

'

'

'

Total

$7,846,000

'

$7,389,000

'

$7,389,000

'

$2,117,000

$457,000

'

'

'

'

'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Changes in accumulated balances of other comprehensive income) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward]	'
Beginning balance, tax	($615)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax [Abstract]	'
Other comprehensive income before relassifications, tax	287
Amounts reclassified from accumulated other comprehensive income, tax	3
Net current-period other comprehensive income, tax	290
Ending balance, tax	-325
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'
Beginning balance, net of tax	3,091
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]	'
Other comprehensive income before relassifications, net of tax	-1,433
Amounts reclassified from accumulated other comprehensive income, net of tax	-5
Net current-period other comprehensive income, net of tax	-1,438
Ending balance, net of tax	1,653
Foreign Currency Translation Gains and Losses [Member]	'
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]	'
Beginning balance, before tax	1,948
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [Abstract]	'
Other comprehensive income before relassifications, before tax	-901
Amounts reclassified from accumulated other comprehensive income, before tax	0
Net current-period other comprehensive income, before tax	-901
Ending balance, before tax	1,047
Unrealized Gains and Losses on Investments [Member]	'
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]	'
Beginning balance, before tax	1,758
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [Abstract]	'
Other comprehensive income before relassifications, before tax	-819
Amounts reclassified from accumulated other comprehensive income, before tax	-8
Net current-period other comprehensive income, before tax	-827
Ending balance, before tax	$931

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Reclassification out of accumulated other comprehensive income) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Provision for income taxes	($7,381)	($9,565)	($18,142)	($23,397)
Total reclassification for the period	'	'	5	'
Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Other expense, net	'	'	-8	'
Provision for income taxes	'	'	3	'
Total reclassification for the period	'	'	$5	'