Qualys (QLYS) 10-K 6 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 27, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	QUALYS, INC.
Entity Central Index Key	1107843
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		33,915,121
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$525

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$76,504	$42,369
Short-term investments	50,714	54,827
Accounts receivable, net of allowance of $590 and $389 at December 31, 2014 and 2013, respectively	32,993	28,581
Current deferred tax assets	8,520	114
Prepaid expenses and other current assets	6,528	4,565
Total current assets	175,259	130,456
Long-term investments	39,448	35,608
Property and equipment, net	26,618	23,075
Noncurrent deferred tax assets	14,119	72
Intangible assets, net	2,001	2,394
Goodwill	317	317
Other noncurrent assets	2,262	681
Total assets	260,024	192,603
Current liabilities:
Accounts payable	5,661	1,930
Accrued liabilities	10,353	9,037
Deferred revenues, current	81,147	67,505
Capital lease obligations, current	0	805
Total current liabilities	97,161	79,277
Deferred revenues, noncurrent	10,064	8,889
Other noncurrent liabilities	972	1,320
Total liabilities	108,197	89,486
Commitments and contingencies (Note 6)
Stockholders' Equity:
Preferred stock: $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at December 31, 2014 and 2013	0	0
Common stock, $0.001 par value; 1,000,000,000 shares authorized, 33,594,285 and 32,375,299 shares issued and outstanding at December 31, 2014 and 2013, respectively	34	32
Additional paid-in capital	195,133	176,641
Accumulated other comprehensive income	10	38
Accumulated deficit	-43,350	-73,594
Total stockholders’ equity	151,827	103,117
Total liabilities and stockholders’ equity	$260,024	$192,603

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable	$590	$389
Preferred Stock, Par Value (in dollars per share)	$0.00	$0.00
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share (in dollars per share)	$0.00	$0.00
Common Stock, Shares Authorized	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued	33,594,285	32,375,299
Common Stock, Shares, Outstanding	33,594,285	32,375,299

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Revenues	$133,579	$107,962	$91,420
Cost of revenues	28,963	24,660	18,404
Gross profit	104,616	83,302	73,016
Operating expenses:
Research and development	26,320	21,678	20,195
Sales and marketing	48,049	42,523	37,738
General and administrative	21,000	16,792	12,079
Total operating expenses	95,369	80,993	70,012
Income from operations	9,247	2,309	3,004
Other income (expense), net:
Interest expense	-9	-43	-192
Interest income	452	375	14
Other income (expense), net	-1,077	-600	-247
Total other income (expense), net	-634	-268	-425
Income before income taxes	8,613	2,041	2,579
(Benefit from) provision for income taxes	-21,631	500	358
Net income	30,244	1,541	2,221
Net income attributable to common stockholders	$30,244	$1,539	$1,049
Net income per share attributable to common stockholders:
Basic (usd per share)	$0.92	$0.05	$0.09
Diluted (in usd per share)	$0.81	$0.04	$0.08
Weighted average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	32,979	31,914	11,891
Diluted (in shares)	37,170	35,973	28,352

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$30,244	$1,541	$2,221
Change in net unrealized gain on investments, net of zero tax	0	38	8
Less: reclassification adjustment for net realized gain included in net income	-28	-8	0
Net change, net of zero tax	-28	30	8
Other comprehensive income (loss), net	-28	30	8
Comprehensive income	$30,216	$1,571	$2,229

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$30,244	$1,541	$2,221
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	11,897	9,612	7,341
Bad debt expense	470	307	218
Loss on disposal of property and equipment	324	12	10
Stock-based compensation	10,549	5,506	3,452
Non-cash interest expense	0	0	24
Amortization of premiums and accretion of discounts on investments	565	282	7
Excess tax benefits from stock-based compensation	-259	-150	0
Deferred income taxes	-22,599	-66	27
Changes in operating assets and liabilities:
Accounts receivable	-4,882	-4,343	-4,014
Prepaid expenses and other assets	-3,456	610	136
Accounts payable	2,332	-100	-223
Accrued liabilities	1,622	437	-972
Deferred revenues	14,817	11,281	13,683
Other noncurrent liabilities	-201	152	14
Net cash provided by operating activities	41,423	25,081	21,924
Cash flows from investing activities:
Purchases of investments	-157,660	-145,263	-83,547
Sales and maturities of investments	157,339	138,124	0
Purchases of property and equipment	-13,914	-13,650	-11,200
Capitalized software development costs	-98	0	0
Release of restricted cash	0	114	0
Purchases of intangible assets	0	0	-49
Net cash used in investing activities	-14,333	-20,675	-94,796
Cash flows from financing activities:
Proceeds from initial public offering, net of offering costs	0	0	84,534
Proceeds from exercise of stock options	7,639	4,073	1,685
Proceeds from early exercise of stock options	0	40	384
Excess tax benefits from stock-based compensation	259	150	0
Principal payments under capital lease obligations	-805	-1,186	-2,401
Non-contingent payment related to acquisition	0	0	-1,000
Net cash provided by financing activities	7,093	3,077	83,202
Effect of exchange rate changes on cash and cash equivalents	-48	1	7
Net increase in cash and cash equivalents	34,135	7,484	10,337
Cash and cash equivalents at beginning of period	42,369	34,885	24,548
Cash and cash equivalents at end of period	76,504	42,369	34,885
Supplemental disclosures of cash flow information
Cash paid for interest expense	9	43	162
Cash paid for income taxes, net of refunds	347	390	299
Non-cash investing and financing activities
Purchases of property and equipment recorded in accounts payable and accrued liabilities	1,399	487	0
Vesting of early exercised common stock options	47	262	155
Conversion of convertible preferred stock to common stock	0	0	63,873
Issuance of common stock for acquisition of license	$0	$0	$51

Consolidated_Statements_of_Con

Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $)	Total	Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2011	($64,424)		$5	$12,927	$0	($77,356)
Convertible Preferred Stock balance at Dec. 31, 2011		63,873
Balance (in shares) at Dec. 31, 2011			5,300,288
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2011		17,597,258
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible Preferred Stock, Conversion of preferred stock to common stock upon initial public offering		-63,873
Convertible Preferred Stock, Conversion of preferred stock to common stock upon initial public offering (in shares)		-17,597,258
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,221					2,221
Change in unrealized gain (loss) on investments	8				8
Issuance of common stock upon initial public offering, net of offering costs	84,534		8	84,526
Issuance of common stock upon initial public offering, net of offering costs (in shares)			7,836,250
Conversion of preferred stock to common stock upon initial public offering	63,873		17	63,856
Conversion of preferred stock to common stock upon initial public offering (shares)			17,597,258
Issuance of common stock upon exercise of stock options	1,685		1	1,684
Issuance of common stock upon exercise of stock options (shares)	724,316		724,316
Vesting of early exercised common stock options	155			155
Repurchase of unvested early exercised stock options	0
Repurchase of unvested early exercised stock options (shares)			-60,126
Issuance of common stock in exchange for services	45			45
Issuance of common stock in exchange for services (shares)			15,945
Issuance of common stock for acquisition of license	51			51
Issuance of common stock for acquisition of license (shares)			6,097
Stock-based compensation	3,407			3,407
Balance at Dec. 31, 2012	91,555		31	166,651	8	-75,135
Convertible Preferred Stock balance at Dec. 31, 2012		0
Balance (in shares) at Dec. 31, 2012			31,420,028
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2012		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,541					1,541
Change in unrealized gain (loss) on investments	30				30
Issuance of common stock upon exercise of stock options	4,073		1	4,072
Issuance of common stock upon exercise of stock options (shares)	952,871		952,871
Vesting of early exercised common stock options	262			262
Excess tax benefits from stock-based compensation	150			150
Repurchase of unvested early exercised stock options	0
Repurchase of unvested early exercised stock options (shares)			-500
Issuance of common stock in exchange for services	41			41
Issuance of common stock in exchange for services (shares)			2,900
Stock-based compensation	5,465			5,465
Balance at Dec. 31, 2013	103,117		32	176,641	38	-73,594
Convertible Preferred Stock balance at Dec. 31, 2013		0
Balance (in shares) at Dec. 31, 2013			32,375,299
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2013		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,244					30,244
Change in unrealized gain (loss) on investments	-28				-28
Issuance of common stock upon exercise of stock options	7,639		2	7,637
Issuance of common stock upon exercise of stock options (shares)	1,216,710		1,216,710
Vesting of early exercised common stock options	47			47
Excess tax benefits from stock-based compensation	259			259
Repurchase of unvested early exercised stock options	0
Repurchase of unvested early exercised stock options (shares)			-125
Issuance of common stock in exchange for services	50			50
Issuance of common stock in exchange for services (shares)			2,401
Stock-based compensation	10,499			10,499
Balance at Dec. 31, 2014	151,827		34	195,133	10	-43,350
Convertible Preferred Stock balance at Dec. 31, 2014		$0
Balance (in shares) at Dec. 31, 2014			33,594,285
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2014		0

The_Company_and_Summary_of_Sig

The Company and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
The Company and Summary of Significant Accounting Policies
	NOTE 1.	The Company and Summary of Significant Accounting Policies
	Description of Business
	Qualys, Inc. (the “Company”) was incorporated in the state of Delaware on December 30, 1999. The Company is headquartered in Redwood City, California and has majority-owned subsidiaries throughout the world. The Company is a pioneer and leading provider of cloud security and compliance solutions that enable organizations to identify security risks to their IT infrastructures, help protect their IT systems and applications from ever-evolving cyber attacks and achieve compliance with internal policies and external regulations. The Company’s cloud solutions address the growing security and compliance complexities and risks that are amplified by the dissolving boundaries between internal and external IT infrastructures and web environments, the rapid adoption of cloud computing and the proliferation of geographically dispersed IT assets. Organizations can use the Company’s integrated suite of solutions delivered on its QualysGuard Cloud Platform to cost-effectively obtain a unified view of their security and compliance posture across globally-distributed IT infrastructures.
	Initial Public Offering
	On October 3, 2012, the Company closed its initial public offering ("IPO") of 8,711,250 shares of common stock at an offering price of $12.00 per share. The offering included 7,836,250 shares sold and issued by the Company and 875,000 shares sold by selling stockholders. The shares sold in the offering included 1,136,250 shares sold by the Company pursuant to the underwriters’ full exercise of their over-allotment option. The net proceeds to the Company from the offering were approximately $87.5 million after deducting underwriting discounts and commissions, and before deducting total expenses in connection with this offering of $2.9 million. Immediately prior to the closing, all of the Company’s 17,597,258 outstanding shares of convertible preferred stock converted into an equivalent number of shares of common stock. The related carrying value of the convertible preferred stock of $63.9 million was reclassified to common stock and additional paid-in capital at the time of the conversion.
	Basis of Presentation
	The accompanying consolidated financial statements and footnotes have been prepared by the Company in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) as well as the instructions to Form 10-K and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). In the opinion of management, the accompanying consolidated financial statements include all adjustments necessary for the fair presentation of the Company’s consolidated financial position, results of operations and cash flows for the periods presented. The accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant intercompany transactions and balances have been eliminated upon consolidation.
	Certain prior year amounts related to income taxes have been reclassified to conform to the current year presentation. These reclassifications did not change previously reported total assets, liabilities, convertible preferred stock, stockholders' equity (deficit), income from operations or net income.
	Correction of Immaterial Error
	During the fourth quarter of 2014, the Company identified an immaterial error in the financial statements of its foreign subsidiaries reporting in the applicable local foreign currencies as their functional currencies, resulting in translation adjustments included as a component of accumulated other comprehensive income (loss) in stockholders' equity. It was determined that the functional currency for the Company's local subsidiaries should be the U.S. dollar. Accordingly, remeasurement gains and losses on monetary assets and liabilities denominated in foreign currencies should be recorded to foreign exchange gains and losses in other income (expense) in the consolidated statements of operations in accordance with GAAP.
	The Company reviewed the accounting error utilizing SEC Staff Accounting Bulletin No. 99, “Materiality” and SEC Staff Accounting Bulletin No. 108, “Effects of Prior Year Misstatements on Current Year Financial Statements.” Management evaluated the materiality of this error from a qualitative and quantitative perspective and determined the impact of the errors did not have a material impact on any individual prior period presentation or affect the trend of financial results. However, because the adjustment to correct the cumulative error on the consolidated balance sheets and statements of stockholders' equity would have had a material effect to the Company's consolidated statements of operations for the year ended December 31, 2014, the Company has revised its previously reported financial statements for the 2012 and 2013 annual periods to reflect the impact of the immaterial errors that have been corrected.
	The following table summarizes the correction of previously reported amounts presented in the accompanying consolidated financial statements (in thousands, expect per share data):
		Year Ended December 31,
		2013						2012
		as reported			as adjusted			as reported			as adjusted
	Consolidated Statements of Operations:
	Other income (expense), net	$	(517	)	$	(600	)	$	(188	)	$	(247	)
	Total other income (expense), net	(185		)	(268		)	(366		)	(425		)
	Net income	1,624			1,541			2,280			2,221
	Net income per share attributable to common stockholders:
	Basic	0.05			0.05			0.09			0.09
	Diluted	0.05			0.04			0.08			0.08
	Consolidated Statements of Comprehensive Income:
	Change in foreign currency translation gain (loss), net of zero tax	(83		)	—			(59		)	—
	Comprehensive Income	1,571			1,571			2,229			2,229
	Consolidated Statements of Cash Flows:
	Net cash provided by operating activities	25,146			25,081			21,952			21,924
	Net cash used in investing activities	(20,688		)	(20,675		)	(94,784		)	(94,796		)
	Effect of exchange rate changes on cash and cash equivalents	(51		)	1			(33		)	7
	Net increase in cash and cash equivalents	7,484			7,484			10,337			10,337
		December 31,
		2013						2012
		as reported			as adjusted			as reported			as adjusted
	Consolidated Balance Sheets:
	Accumulated other comprehensive income (loss)	$	(1,088	)	$	38		$	(1,035	)	$	8
	Accumulated deficit	(72,468		)	(73,594		)	(74,092		)	(75,135		)
	Total stockholders' equity	103,117			103,117			91,555			91,555
		December 31,
		2013						2012						2011
		as reported			as adjusted			as reported			as adjusted			as reported			as adjusted
	Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit):
	Accumulated other comprehensive income (loss)	$	(1,088	)	$	38		$	(1,035	)	$	8		$	(984	)	$	—
	Accumulated deficit	(72,468		)	(73,594		)	(74,092		)	(75,135		)	(76,372		)	(77,356		)
	Total stockholders' equity (deficit)	103,117			103,117			91,555			91,555			(64,424		)	(64,424		)
	Use of Estimates
	The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported results of operations during the reporting period. The Company’s management regularly assesses these estimates, which primarily affect revenue recognition, the valuation of accounts receivable, goodwill and intangible assets, common stock, stock-based compensation and the valuation allowances associated with deferred tax assets. Actual results could differ from those estimates and such differences may be material to the accompanying consolidated financial statements.
	Concentration of Credit Risk
	The Company invests its cash and cash equivalents with major financial institutions. Cash balances with any one institution at times may be in excess of federally insured limits. Cash equivalents are invested in high-quality investment grade financial instruments and are diversified. The Company has not experienced any losses in such accounts and believes it is not exposed to any significant credit risk.
	Credit risk with respect to accounts receivable is dispersed due to the large number of customers. In addition, the Company’s credit risk is mitigated by the relatively short collection period. Collateral is not required for accounts receivable. The Company maintains an allowance for potential credit losses based upon the expected collectability of accounts receivable. The Company writes off its receivables when collectability is deemed to be doubtful. As of December 31, 2014 and 2013, no customer or channel partner accounted for more than 10% of the Company's accounts receivable balance.
	Cash, Cash Equivalents, Short-Term and Long-Term Investments
	Cash and cash equivalents include cash held in banks and highly liquid money market funds, commercial paper, and fixed-income U.S. government agency securities, all with original maturities of three months or less when acquired. The Company’s investments consist of fixed-income U.S. government agency securities, corporate bonds, municipal bonds, asset-backed securities and commercial paper. Management determines the appropriate classification of the Company's investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company classifies its investments as either short-term or long-term based on each instrument's underlying contractual maturity date.
	Cash equivalents are stated at cost, which approximates fair market value. Short-term and long-term investments are classified as available-for-sale and are carried at fair value. Unrealized gains and losses in fair value are reported in other comprehensive income (loss). When the available-for-sale securities are sold, cost is based on the specific identification method, and the realized gains and losses are included in other income (expense) in the consolidated statements of operations. Short-term and long-term investments are reviewed quarterly for impairment that is deemed to be other-than-temporary. An investment is considered other-than-temporarily impaired when its fair value is below its amortized cost and (1) there is an intent to sell the security, (2) it is “more likely than not” that the security will be sold before recovery of its amortized cost basis or (3) the present value of expected cash flows from the investment is not expected to recover the entire amortized cost basis. Declines in value that are considered to be other-than-temporary and adjustments to amortized cost for the amortization of premiums and the accretion of discounts are recorded in other income (expense). Interest and dividends are recorded in interest income as earned.
	Accounts Receivable
	Accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts represents the Company’s best estimate of the amount of probable credit losses and is determined based on a review of existing accounts receivable by aging category to identify significant customers or invoices with collectability issues. For those invoices not specifically reviewed, the reserve is calculated based on the age of the receivable.
	Any change in the assumptions used in analyzing a specific account receivable may result in an additional provision for doubtful accounts being recognized in the period in which the change occurs. When the Company ultimately concludes that a receivable is uncollectible, the balance is written off against the allowance for doubtful accounts. Payments subsequently received on such receivables are credited back to the allowance for doubtful accounts.
	Property and Equipment, net
	Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which range from three to five years. Leasehold improvements are amortized on a straight-line basis over the lesser of the estimated useful life of the asset or the lease term. Property under capital lease is amortized over the term of the respective lease or the estimated useful life of the asset, whichever is shorter.
	The Company purchases physical scanner appliances and other computer equipment that are provided on a subscription basis. This equipment is recorded within property and equipment on the accompanying consolidated balance sheet, and the depreciation is recorded to cost of revenues over an estimated useful life of three years.
	Upon retirement or disposal, the cost of assets and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations. Repairs and maintenance that do not extend the life of an asset are expensed as incurred and major improvements are capitalized as property and equipment.
	Impairment of Long-Lived Assets
	The Company evaluates its long-lived assets, which consist of property and equipment, and intangible assets subject to amortization, for indicators of possible impairment when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if the carrying amounts of such assets exceed the estimates of future undiscounted cash flows expected to be generated by such assets. Should an impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s estimated fair value. As of December 31, 2014 and 2013, the Company has not written down any of its long-lived assets as a result of impairment.
	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination and is not subject to amortization. Goodwill and other intangible assets with indefinite lives are not amortized, but tested for impairment annually or if certain circumstances indicate a possible impairment may exist. These tests are performed at the reporting unit level. The Company’s operations are organized as one reporting unit.
In testing for a potential impairment of goodwill, the Company first performs a qualitative assessment of its reporting unit to determine if it is more likely than not (a more than 50% likelihood) that the fair value of the reporting unit is less than its carrying amount. If the fair value is not considered to be less than the carrying amount, no further evaluation is necessary. The Company performed the annual qualitative assessment for the year ended December 31, 2014 and concluded there was no impairment of goodwill.
In testing for a potential impairment of intangible assets with indefinite lives that are not subject to amortization, the Company first performs a qualitative assessment to determine if it is more likely than not (a more than 50% likelihood) that the fair value of the indefinite-lived intangible assets is less than the carrying amount. If the fair value is not considered to be less than the carrying amount, no further evaluation is necessary. The Company performed the annual qualitative assessment as of December 31, 2014 and concluded there was no impairment of the indefinite-lived intangible assets.
If the qualitative assessment indicates there is more than a 50% likelihood that the fair value is less than the carrying amount, the Company would perform a two-step test. In the first step, the carrying value of the reporting unit or intangible asset is compared to its estimated fair value. If the estimated fair value is less than the carrying value, then potential impairment exists. In the second step, for goodwill, the Company calculates the amount of any impairment by determining the implied fair value of goodwill using a hypothetical purchase price allocation, similar to that which would be applied if it were an acquisition and the purchase price was equivalent to fair value as calculated in the first step. Impairment is equivalent to any excess of goodwill carrying value over its implied fair value. For indefinite-lived intangible assets, the Company performs the currently prescribed quantitative impairment test by comparing the fair value of the indefinite-lived intangible asset with its carrying value.
Certain other intangible assets acquired are amortized over their estimated useful lives and tested for impairment if certain circumstances indicate an impairment may exist. The Company’s intangible assets are comprised primarily of existing technology, patent license, and non-competition agreements and are amortized over periods ranging from three to fourteen years on a straight-line basis.
Software Development Costs
The Company capitalizes qualifying software costs developed or obtained for internal use. These costs generally include internal costs, such as payroll and benefits of those employees directly associated with the development of the software, and other consulting expenses. During the year ended December 31, 2014, the Company capitalized software development costs of $0.1 million. No costs were capitalized during the year ended December 31, 2013. Total capitalized development costs are $0.4 million and $0.3 million at December 31, 2014 and 2013, respectively, and the related accumulated amortization is $0.3 million at both December 31, 2014 and 2013.
Derivative Financial Instruments
Derivative financial instruments are utilized by the Company to reduce foreign currency exchange risks. The Company uses foreign currency forward contracts to mitigate the impact of foreign currency fluctuations of certain non-U.S. dollar denominated asset positions, primarily cash and accounts receivable. These contracts are recorded within prepaid expenses and other current assets in the consolidated balance sheets. Gains and losses resulting from currency exchange rate movements on these forward contracts are recognized in other income (expense) in the accompanying consolidated statements of operations in the period in which the exchange rates change and offset the foreign currency gains and losses on the underlying exposure being hedged. The Company does not enter into derivative financial instruments for trading or speculative purposes.
At December 31, 2014, the Company had two outstanding forward contracts with notional amounts of 6.0 million Euros and 2.1 million British Pounds, which expired on on January 31, 2015. At December 31, 2013, the Company had two outstanding forward contracts with notional amounts of 6.3 million Euros and 2.0 million British Pounds, which expired on January 31, 2014. These forward contracts were entered into as of December 31, 2014 and 2013, respectively, and thus the fair value of the contracts was $0 at both December 31, 2014 and 2013. In 2014, the Company recorded a net gain of $0.7 million from forward contracts, which was offset by foreign currency transaction losses of $1.4 million for the year. In 2013, the Company recorded a net loss of $0.8 million from forward contracts, which was partially offset by foreign currency transaction gains of $0.2 million for the year. These derivatives did not meet the criteria to be designated as hedges.
Stock-Based Compensation
The Company recognizes stock-based compensation expense for its employee stock options over the requisite service period for awards of equity instruments based on the grant-date fair value of those awards expected to vest. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs materially from original estimates.
Option grants to non-employees are accounted for at the fair value of the equity instrument issued, as calculated using the Black-Scholes option-pricing model and the expense is recognized over the vesting periods of the options. The value of options granted to non-employees is remeasured as they vest over a performance period.
Revenue Recognition
The Company derives revenues from subscriptions that require customers to pay a fee in order to access the Company’s cloud solutions. Customers generally enter into one year renewable subscriptions. The subscription fee entitles the customer to an unlimited number of scans for a specified number of networked devices or web applications and, if requested by a customer as part of their subscription, a specified number of physical or virtual scanner appliances. The Company’s physical and virtual scanner appliances are requested by certain customers as part of their subscriptions in order to scan IT infrastructures within their firewalls and do not function without, and are not sold separately from, subscriptions for the Company’s solutions. In some limited cases, the Company also provides certain computer equipment used to extend its QualysGuard Cloud Platform into its customers’ private cloud environment. Customers are required to return physical scanner appliances and computer equipment if they do not renew their subscriptions.
The Company recognizes revenues when all of the following conditions are met:
•	There is persuasive evidence of an arrangement.
•	The service has been provided to the customer.
•	The collection of the fees is reasonably assured.
•	The amount of fees to be paid by the customer is fixed or determinable.
Subscriptions are recognized ratably over the subscription period. The Company recognizes revenues from subscriptions that include physical scanner appliances and other computer equipment ratably over the period of the subscription. Because the customer’s access to the Company’s cloud solutions are delivered at the same time as or within close proximity to the delivery of physical scanner appliances and the terms are commensurate for these services and equipment, the Company considers these elements as a single unit of accounting recognized ratably over the subscription period.
Deferred revenues consist of revenues billed or received that will be recognized in the future under subscriptions existing at the balance sheet date. The current portion of deferred revenues represents amounts that are expected to be recognized within one year of the balance sheet date.
Costs of shipping and handling charges incurred by the Company associated with physical scanner appliances and other computer equipment are included in cost of revenues.
Sales taxes and other taxes collected from customers to be remitted to government authorities are excluded from revenues.
Advertising Expenses
Advertising costs are expensed as incurred and include costs of advertising, trade show costs and promotional materials. The Company incurred advertising costs of $5.3 million, $4.2 million, and $4.3 million for 2014, 2013 and 2012, respectively.
Income Taxes
The Company uses the asset and liability method to account for income taxes. Under this method, deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities. Deferred tax assets and liabilities are measured using statutory tax rates and laws that will be in effect when the differences are expected to reverse. A valuation allowance is established, when necessary, to reduce deferred tax assets to the amount expected to be realized.
The Company operates in various tax jurisdictions and is subject to audit by various tax authorities. Tax positions are based upon their technical merits, relevant tax law and the specific facts and circumstances as of each reporting period. Changes in facts and circumstances could result in material changes to the amounts recorded for such tax positions. A tax position is only recognized in the financial statements if it is “more likely than not” to be sustained based solely on its technical merits as of the reporting date. The Company considers many factors when evaluating and estimating its tax positions and tax benefits, which may require periodic adjustments that could result in recognition of additional tax benefits or additional charges to the tax provision and may not accurately reflect the actual outcomes. The Company’s policy is to recognize interest and penalties relating to unrecognized tax benefits as a component of the provision for income taxes.
Other Comprehensive Income (Loss)
Other comprehensive income (loss) consists of unrealized gains (losses) on available-for-sale investments, net of tax, which are not included in the Company’s net income. Total comprehensive income includes net income and other comprehensive income (loss) and is included in the consolidated statements of comprehensive income.
Foreign Currency Transactions
The Company’s operations are conducted in various countries around the world and the financial statements of its foreign subsidiaries are reported in the U.S. dollar as their respective functional currency. Monetary assets and liabilities denominated in foreign currencies have been remeasured into U.S. dollars using the exchange rates in effect at the balance sheet date, and income and expenses are remeasured at average exchange rates during the period. Foreign currency remeasurement gains and losses and foreign currency transaction gains and losses are recognized in other income (expense), net. The Company recorded total foreign currency transaction losses of $(0.7) million, $(0.7) million and $(0.2) million during 2014, 2013 and 2012, respectively.
Fair Value Measurements
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For certain of the Company’s financial instruments, including certain cash equivalents, accounts receivable, accounts payable, and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances.
The Company measures and reports certain cash equivalents, investments and derivative foreign currency forward contracts at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy is broken down into three levels based on the reliability of inputs as follows:
Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities.
Level 2—Valuations based on other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3—Valuations based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability.
The Company's financial instruments consist of assets measured using Level 1 and 2 inputs. Level 1 assets include a highly liquid money market fund, which is valued using unadjusted quoted prices that are available in an active market for an identical asset. Level 2 assets include fixed-income U.S. government agency securities, commercial paper, corporate bonds, municipal bonds and asset-backed securities and derivative financial instruments consisting of foreign currency forward contracts. The securities, bonds and commercial paper are valued using prices from independent pricing services based on quoted prices in active markets for similar instruments or on industry models using data inputs such as interest rates and prices that can be directly observed or corroborated in active markets. The foreign currency forward contracts are valued using observable inputs, such as quotations on forward foreign exchange points and foreign interest rates. See Note 2 for more information regarding the fair value measurement of the Company's financial instruments.
Net Income Per Share Attributable to Common Stockholders
The Company computes net income attributable to common stockholders using the two-class method required for participating securities. Convertible preferred stock and common stock subject to repurchase resulting from the early exercise of stock options are considered to be participating securities since they contain non-forfeitable rights to dividends or dividend equivalents in the event the Company declares a dividend for common stock. In accordance with the two-class method, earnings allocated to these participating securities are subtracted from net income after deducting preferred stock dividends, if any, to determine total undistributed earnings to be allocated to common stockholders. The holders of convertible preferred stock did not have a contractual obligation to share in net losses and such shares were excluded from the computation of basic earnings per share in periods of net loss.
Basic net income per share attributable to common stockholders is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. All participating securities are excluded from basic weighted average common shares outstanding. In computing diluted net income attributable to common stockholders, undistributed earnings are reallocated to reflect the potential impact of dilutive securities. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, adjusted for the effects of potentially dilutive common shares, which comprise outstanding stock options, warrants, convertible preferred stock and contingently issuable shares related to an acquisition. The dilutive potential common shares are computed using the treasury stock method or the as-if converted method, as applicable. The effects of outstanding stock options, warrants, convertible preferred stock and contingently issuable shares related to an acquisition are excluded from the computation of diluted net income per common share in periods in which the effect would be antidilutive.
Recent Accounting Pronouncements
Under the Jumpstart Our Business Startups Act (the "JOBS Act"), the Company meets the definition of an “emerging growth company.” The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. As a result, the Company will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required from non-emerging growth companies.
In July 2013, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standard Update (“ASU”) that provides guidance on the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. An unrecognized tax benefit should be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward when settlement in this manner is available under the tax law. The Company adopted this standard in 2014 and the adoption of this standard did not have a material impact on the consolidated financial statements.
In May 2014, the FASB issued an ASU amending revenue recognition guidance and requiring more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The guidance is effective for annual and interim reporting periods beginning after December 15, 2016, with early adoption prohibited. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements.
In January 2015, the FASB issued an ASU eliminating from U.S. GAAP the concept of extraordinary items, which required that an entity separately classify, present, and disclose extraordinary events and transactions. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. A reporting entity may apply the amendments prospectively or retrospectively to all prior periods presented in the financial statements. Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements.
Reverse Stock Split
In September 2012, the Company’s board of directors and stockholders approved an amendment to the Company’s amended and restated certificate of incorporation effecting a one-for-ten reverse stock split of the Company’s issued and outstanding shares of common and convertible preferred stock. The par value of the common and convertible preferred stock was not adjusted as a result of the reverse stock split. All issued and outstanding common stock, convertible preferred stock, warrants for convertible preferred stock, options for common stock, contingently issuable shares of common stock and per share amounts contained in the Company’s consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments
	NOTE 2.	Fair Value of Financial Instruments
	The Company's cash and cash equivalents, short-term investments, and long-term investments consist of the following:
			31-Dec-14
			Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
			(in thousands)
	Cash and cash equivalents:
	Cash		$	36,024	$	—	$	—		$	36,024
	Money market funds		39,180		—		—			39,180
	U.S. government agencies		300		—		—			300
	Commercial paper		1,000		—		—			1,000
	Total		76,504		—		—			76,504
	Short-term investments:
	Commercial paper		4,998		1		—			4,999
	Corporate bonds		12,438		6		(6		)	12,438
	U.S. government agencies		33,280		3		(6		)	33,277
	Total		50,716		10		(12		)	50,714
	Long-term investments:
	Asset-backed securities		16,092		5		(3		)	16,094
	U.S. government agencies		20,243		22		(10		)	20,255
	Corporate bonds		3,101		—		(2		)	3,099
	Total		39,436		27		(15		)	39,448
	Total		$	166,656	$	37	$	(27	)	$	166,666
			31-Dec-13
			Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
			(in thousands)
	Cash and cash equivalents:
	Cash		$	27,488	$	—	$	—		$	27,488
	Money market funds		183		—		—			183
	Commercial paper		14,697		1		—			14,698
	Total		42,368		1		—			42,369
	Short-term investments:
	Commercial paper		32,784		6		—			32,790
	Corporate bonds		16,894		11		—			16,905
	Municipal bonds		1,128		—		—			1,128
	U.S. government agencies		4,004		—		—			4,004
	Total		54,810		17		—			54,827
	Long-term investments:
	Asset-backed securities		5,497		4		—			5,501
	U.S. government agencies		14,835		1		(3		)	14,833
	Corporate bonds		15,256		22		(4		)	15,274
	Total		35,588		27		(7		)	35,608
	Total		$	132,766	$	45	$	(7	)	$	132,804
	The following table sets forth by level within the fair value hierarchy the fair value of the Company's available-for-sale securities measured on a recurring basis, excluding cash and money market funds:
			31-Dec-14
			Level 1		Level 2		Level 3			Fair Value
			(in thousands)
	Commercial paper		$	—	$	5,999	$	—		$	5,999
	U.S. government agencies		—		53,832		—			53,832
	Corporate bonds		—		15,537		—			15,537
	Asset-backed securities		—		16,094		—			16,094
	Total		$	—	$	91,462	$	—		$	91,462
			31-Dec-13
			Level 1		Level 2		Level 3			Fair Value
			(in thousands)
	Commercial paper		$	—	$	47,488	$	—		$	47,488
	U.S. government agencies		—		18,837		—			18,837
	Municipal bonds		—		1,128		—			1,128
	Corporate bonds		—		32,179		—			32,179
	Asset-backed securities		—		5,501		—			5,501
	Total		$	—	$	105,133	$	—		$	105,133
	The following summarizes the fair value of securities classified as available-for-sale by contractual maturity:
			31-Dec-14
			Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
Commercial paper		$	5,999	$	—	$	—		$	5,999
U.S. government agencies		33,577		20,255		—			53,832
Corporate bonds		12,438		3,099		—			15,537
Asset-backed securities		—		7,327		8,767			16,094
Total		$	52,014	$	30,681	$	8,767		$	91,462
		31-Dec-13
		Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
Commercial paper		$	47,488	$	—	$	—		$	47,488
U.S. government agencies		4,004		14,833		—			18,837
Municipal bonds		1,128		—		—			1,128
Corporate bonds		16,905		15,274		—			32,179
Asset-backed securities		—		—		5,501			5,501
Total		$	69,525	$	30,107	$	5,501		$	105,133
At December 31, 2014 and 2013, derivative financial instruments, consisting of foreign currency forward contracts, were valued at $0 as the contracts were entered into on the last day of the respective reporting periods. These instruments were valued using Level 2 inputs.
There were no transfers between Level 1, Level 2 or Level 3 of the fair value hierarchy, as determined at the end of each reporting period.

Property_and_Equipment_Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment, net
	NOTE 3.	Property and Equipment, Net
	Property and equipment, which includes assets under capital lease, consists of the following:
			December 31,
			2014			2013
			(in thousands)
	Computer equipment		$	35,576		$	27,464
	Computer software		10,899			9,277
	Furniture, fixtures and equipment		2,931			2,031
	Scanner appliances		19,861			17,055
	Leasehold improvements		2,622			2,100
	Total property and equipment		71,889			57,927
	Less: accumulated depreciation and amortization		(45,271		)	(34,852		)
	Property and equipment, net		$	26,618		$	23,075
	There were no assets under capital lease at December 31, 2014. Assets held under capital lease at December 31, 2013 included in computer software totaled approximately $3.1 million, and the related accumulated depreciation totaled $1.2 million.
	Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers have a net carrying value of $6.0 million and $4.7 million at December 31, 2014 and 2013, respectively, including assets that have not been placed in service of $1.4 million and $0.6 million, respectively. Other fixed assets not placed in service at December 31, 2014 and 2013, included in computer equipment and leasehold improvements, were $2.8 million and $1.6 million, respectively. Depreciation and amortization expense relating to property and equipment, including capitalized leases, was $11.5 million, $9.2 million and $6.9 million for 2014, 2013 and 2012, respectively.

Business_Combination

Business Combination	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combination
	NOTE 4.	Business Combination
	On August 31, 2010, the Company acquired Nemean Networks, LLC (“Nemean”), a company developing network security solutions for detection and awareness of external intrusions to computer networks. The Company acquired Nemean to provide additional solutions on its cloud platform. The consideration for this acquisition consisted of $3.7 million in cash and common stock, including a non-contingent payment of $1.0 million in cash and 6,250 shares of common stock, both of which occurred in September 2012. The Company accounted for this transaction as a business combination.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets, Net	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]
	NOTE 5.	Goodwill and Intangible Assets, Net
	Intangible assets consist primarily of existing technology, patent license and non-competition agreements acquired in business combinations. Acquired intangibles are amortized on a straight-line basis over the respective estimated useful lives of the assets.
	The carrying values of intangible assets are as follows (in thousands):
						December 31,
						2014					2013
			Estimated Lives	Cost		Accumulated Amortization			Net Book Value		Accumulated Amortization			Net Book Value
	Existing technology		7 years	$	1,910	$	(1,183	)	$	727	$	(909	)	$	1,001
	Patent license		14 years	1,388		(422		)	966		(323		)	1,065
	Non-competition agreements and other		3 years	171		(158		)	13		(138		)	33
	Total intangibles subject to amortization			$	3,469	$	(1,763	)	1,706		$	(1,370	)	2,099
	Intangible assets not subject to amortization								295					295
	Total intangible assets, net								$	2,001				$	2,394
	Intangibles amortization expense for each of 2014, 2013 and 2012 was $0.4 million.
	As of December 31, 2014, the Company expects amortization expense in future periods to be as follows (in thousands):
	2015	$	386
	2016	373
	2017	282
	2018	100
	2019	100
	2020 and thereafter	465
	Total expected future amortization expense	$	1,706
	Goodwill, which is not subject to amortization, totaled $0.3 million as of December 31, 2014 and 2013.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
	NOTE 6.	Commitments and Contingencies
	Leases
	The Company leases certain computer equipment and its corporate office and data center facilities under noncancelable operating leases for varying periods through 2019.
	In 2011, the Company entered into a $3.1 million financing arrangement for computer software, accounted for as a capital lease, with minimum quarterly payments scheduled through 2014. The capital lease obligation had an interest rate of 1.8% and was secured by the related computer equipment software. In connection with this transaction, the Company also had minimum obligations for related maintenance and support. Minimum obligations were $0.3 million at December 31, 2013 and were recorded in current liabilities in the accompanying consolidated balance sheet. There were no remaining capital lease obligations as of December 31, 2014.
	The following are the minimum annual lease payments due under operating leases at December 31, 2014:
			Operating Leases
			(in thousands)
	2015		$	4,409
	2016		3,046
	2017		1,830
	2018		439
	2019		226
	Total minimum lease payments		$	9,950
	Rent expense was $6.2 million, $5.4 million and $4.3 million for 2014, 2013 and 2012, respectively. Although certain of the operating lease agreements provide for escalating rent payments over the terms of the leases, rent expense under these agreements is recognized on a straight-line basis. As of December 31, 2014 and 2013, the Company has accrued $0.5 million and $0.6 million, respectively, of deferred rent related to these agreements, which is reflected in accrued liabilities and other noncurrent liabilities in the accompanying consolidated balance sheets.
	Sales and Other Taxes
	The Company’s software-as-a-service solutions are subject to sales and other taxes in certain jurisdictions where the Company does business. The Company bills sales and other taxes to customers and remits these to the respective government authorities. For those jurisdictions where the Company has not yet billed sales tax to its customers and believes it is probable it may have exposure and can reasonably estimate such exposure, it has recorded a liability of $0.5 million at each of December 31, 2014 and 2013, which is recorded within accrued liabilities in the consolidated balance sheets. However, taxing jurisdictions have differing rules and regulations, which are subject to varying interpretations that may change over time. Other than the liability that the Company has accrued in its consolidated balance sheets, the Company has been unable to assess the probability, or estimate the amount, of its sales tax exposure, if any. There are no pending reviews at December 31, 2014 of which the outcome is expected to result in sales and other taxes due in excess of accrued liabilities. Management does not anticipate that its sales tax exposure, if any, would have a material adverse effect on the financial position, results of operations or cash flows of the Company.
	Indemnifications
	The Company from time to time enters into certain types of contracts that contingently require it to indemnify various parties against claims from third parties. These contracts primarily relate to (i) the Company's by-laws, under which it must indemnify directors and executive officers, and may indemnify other officers and employees, for liabilities arising out of their relationship, (ii) contracts under which the Company must indemnify directors and certain officers for liabilities arising out of their relationship, and (iii) contracts under which the Company may be required to indemnify customers or resellers from certain liabilities arising from potential infringement of intellectual property rights, as well as potential damages caused by limited product defects. To date, the Company has not incurred and has not recorded any liability in connection with such indemnifications.
	The Company maintains director and officer insurance, which may cover certain liabilities arising from its obligation to indemnify its directors.
	Contingencies
	From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of its business activities. The Company accrues a liability for such matters when it is probable a loss has been incurred and such loss can be reasonably estimated. At December 31, 2014, the Company has not recorded any material liabilities in accordance with accounting for contingencies.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity
	NOTE 7.	Stockholders' Equity
	Common Stock
	The Company had reserved shares of common stock for future issuance as of December 31, 2014:
	Options outstanding under equity incentive plans
	2000 Equity Incentive Plan (1)		3,970,662
	2012 Equity Incentive Plan (1)		3,634,745
	Shares available for future grants under an equity incentive plan
	2012 Equity Incentive Plan (1)		803,630
	Total shares reserved for future issuance		8,409,037
	(1) See Note 8 for a description of these plans.
	Preferred Stock
	Effective October 3, 2012, the Company is authorized to issue 20,000,000 shares of undesignated preferred stock with a par value of $0.001 per share. Each series of preferred stock will have such rights and preferences including dividend rights, dividend rate, conversion rights, voting rights, rights and terms of redemption (including sinking fund provisions), redemption price, and liquidation preferences as determined by the Board. As of December 31, 2014 and 2013, there are no issued or outstanding shares of preferred stock.

Employee_Stock_and_Benefit_Pla

Employee Stock and Benefit Plans	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Employee Stock and Benefit Plans
	NOTE 8.	Employee Stock and Benefit Plans
	Stock Options
	2012 Equity Incentive Plan
	The 2012 Equity Incentive Plan (the "2012 Plan") was adopted and approved in September 2012 and became effective on September 26, 2012. Under the 2012 Plan, the Company is authorized to grant to eligible participants incentive stock options (“ISOs”), nonstatutory stock options (“NSOs”), stock appreciation rights ("SARs"), restricted stock awards ("RSAs"), restricted stock units ("RSUs"), performance units and performance shares equivalent to up to 4,668,764 shares of common stock as of December 31, 2014. The number of shares of common stock available for issuance under the 2012 Plan includes an annual increase on January 1 of each year by an amount equal to the least of 3,050,000 shares; 5% of the outstanding shares of stock as of the last day of the immediately preceding fiscal year; or an amount determined by the board of directors. Options may be granted with an exercise price that is at least equal to the fair market value of the Company's stock at the date of grant and are exercisable when vested. Options granted generally vest over a period of up to four years, with a maximum term of ten years. ISOs may only be granted to employees and any subsidiary corporations' employees. All other awards may be granted to employees, directors and consultants and subsidiary corporations' employees and consultants. Options, SARs, RSAs, RSUs, performance units and performance awards may be granted with vesting terms as determined by the board of directors and expire no more than ten years after the date of grant or earlier if employment or service is terminated. As of December 31, 2014, 803,630 shares were available for grant under the 2012 Plan.
	2000 Equity Incentive Plan
	Under the 2000 Equity Incentive Plan (the "2000 Plan"), the Company was authorized to grant to eligible participants either ISOs or NSOs. The ISOs were granted at a price per share not less than the fair market value at the date of grant. The NSOs were granted at a price per share not less than 85% of the fair market value at the date of grant. Options granted generally vest over a period of up to four years, with a maximum term of ten years. The 2000 Plan was terminated in connection with the closing of the IPO, and accordingly, no shares are currently available for issuance under the 2000 Plan. The 2000 Plan continues to govern outstanding awards granted thereunder.
	Options granted under the 2000 Plan were immediately exercisable, and unvested shares are subject to repurchase by the Company. Upon termination of employment of an option holder, the Company has the right to repurchase at the original purchase price any issued but unvested common shares. The amounts paid for shares purchased under an early exercise of stock options and subject to repurchase by the Company are not reported as a component of stockholders’ equity (deficit) until those shares vest. The amounts received in exchange for these shares are recorded as an accrued liability in the accompanying consolidated balance sheets and will be reclassified to common stock and additional paid-in capital as the shares vest.
	Employee Stock-based Compensation
	Stock-based employee compensation is included in the consolidated statements of operations as follows:
			Year Ended December 31,
			2014				2013			2012
			(in thousands)
	Cost of revenues		$	757			$	421		$	272
	Research and development		2,463				1,038			649
	Sales and marketing		2,394				1,244			993
	General and administrative		4,217				1,842			1,008
	Total stock-based employee compensation		$	9,831			$	4,545		$	2,922
	Compensation cost is recognized on a straight-line basis over the service period. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	As of December 31, 2014, the Company had $27.1 million of total unrecognized employee compensation cost related to nonvested awards that it expects to recognize over a weighted-average period of 2 years.
	The fair value of each option granted to employees is estimated on the date of grant using the Black-Scholes option-pricing model based on the following assumptions:
			Year Ended December 31,
			2014		2013		2012
	Expected term (in years)		5.3 to 5.9		5.4 to 6.1		5.3 to 6.1
	Volatility		48% to 52%		52% to 53%		52% to 53%
	Risk-free interest rate		1.5% to 1.7%		0.7% to 1.5%		0.6% to 0.9%
	Dividend yield		—		—		—
	The expected term of the options is based on evaluations of historical and expected future employee exercise behavior. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected term at the grant date. Volatility is based on historical volatility of several public entities that are similar to the Company, as the Company does not have sufficient historical transactions in its own shares on which to base expected volatility. The Company has not historically issued any dividends and does not expect to in the future.
	Non-Employee Stock-based Compensation
	The Company records compensation representing the fair value of stock options granted to non-employees. Stock-based non-employee compensation was $0.7 million, $0.9 million and $0.5 million for 2014, 2013 and 2012, respectively. Non-employee stock-based compensation is recognized over the vesting periods of the options. The value of options granted to non-employees is remeasured as they vest over a performance period.
	Stock Option Plan Activity
	A summary of the Company’s stock option activity is as follows:
			Outstanding			Weighted			Weighted		Aggregate
			Shares			Average			Average		Intrinsic
						Exercise			Remaining		Value
						Price			Contractual
									Life (Years)
											(in thousands)
	Balance as of December 31, 2011		6,312,041			$	3.36		6.9		$	16,012
	Granted		1,478,781			8.94
	Exercised		(724,316	)		2.86
	Canceled		(552,998	)		6.79
	Balance as of December 31, 2012		6,513,508			4.39			6.6		67,711
	Granted		2,001,400			15.78
	Exercised		(952,871	)		4.32
	Canceled		(522,944	)		10.71
	Balance as of December 31, 2013		7,039,093			7.17			6.5		112,312
	Granted		2,744,150			26.16
	Exercised		(1,216,710	)		6.28
	Canceled		(961,126	)		16.91
	Balance as of December 31, 2014		7,605,407			12.93			6.5		188,743
	Vested and expected to vest—December 31, 2014		6,931,052			11.87			6.2		179,352
	Exercisable—December 31, 2014		4,598,180			5.68			5		146,714
	The following table summarizes the outstanding and vested stock options at December 31, 2014:
			Outstanding								Vested
	Exercise Price		Number of			Weighted			Weighted		Number of		Weighted
			Shares			Average			Average		Shares		Average
						Exercise			Remaining				Exercise
						Price Per			Contractual				Price Per
						Share			Life (Years)				Share
	$1.00 - $1.50		238,559			$	1.4		1.5		238,559		$	1.4
	$1.90 - $1.90		941,482			1.9			2.1		941,482		1.9
	$2.10 - $2.80		461,758			2.62			3.9		461,758		2.62
	$3.80 - $3.80		1,148,568			3.8			4.8		1,126,625		3.8
$4.10 - $8.40		924,121			5.55			6		826,292		5.35
$8.90 - $12.68		846,930			11.2			7.9		392,645		10.93
$13.50 - $20.80		962,889			18.5			8.5		250,599		17.03
$22.31 - $23.51		383,050			23.28			9.6		45,009		22.55
$26.86 - $26.86		701,350			26.86			9		29,728		26.86
$30.58 - $30.58		996,700			30.58			9.4		66,927		30.58
		7,605,407			12.93			6.5		4,379,624		5.58
The weighted-average grant date fair value of the Company’s stock options granted during 2014, 2013 and 2012 was $12.07, $7.62 and $4.27, respectively. The aggregate grant date fair value of the Company’s stock options granted during 2014, 2013 and 2012 was $33.1 million, $15.2 million and $6.3 million, respectively.
The intrinsic value of options exercised was $25.7 million, $11.1 million and $4.0 million during 2014, 2013 and 2012, respectively. Intrinsic value of an option is the difference between the fair value of the Company’s common stock at the time of exercise and the exercise price paid.
Restricted Stock
The terms and conditions of RSAs, including vesting criteria and timing are set by the board of directors. The cost of RSAs is determined using the fair value of the Company’s common stock on the date of the grant. Compensation cost is recognized on a straight-line basis over the requisite service period of each grant adjusted for estimated forfeitures. Recipients of RSAs generally have voting and dividend rights without regard to vesting. The Company has the right to repurchase shares that do not vest.
During 2014, 2013 and 2012, the Company granted 2,401, 2,900 and 3,750 shares of restricted stock, respectively, which vested immediately and had no further restrictions or service period, and resulted in compensation expense of $51,000, $41,000 and $37,000, respectively.
401(k) Plan
The Company’s 401(k) Plan (the “401(k) Plan”) was established in 2000 to provide retirement and incidental benefits for its employees. As allowed under section 401(k) of the Internal Revenue Code, the 401(k) Plan provides tax-deferred salary deductions for eligible employees. Contributions to the 401(k) Plan are limited to a maximum amount as set periodically by the Internal Revenue Service. To date, the Company has not made any contributions to the 401(k) Plan.

Other_Income_Expense_Net

Other Income (Expense), Net	12 Months Ended
	Dec. 31, 2014
Other Income and Expenses [Abstract]
Other Income (Expense), Net
	NOTE 9.	Other Income (Expense), Net
	Other income (expense), net consists of the following:
			Year Ended December 31,
			2014			2013			2012
			(in thousands)
	Foreign exchange losses		$	(664	)	$	(679	)	$	(238	)
	Other income (expense)		(413		)	79			(9		)
	Other income (expense), net		$	(1,077	)	$	(600	)	$	(247	)

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes
	NOTE 10.	Income Taxes
	The Company’s geographical breakdown of income before income taxes is as follows:
			Year Ended December 31,
			2014				2013				2012
			(in thousands)
	Domestic		$	7,384			$	947			$	1,656
	Foreign		1,229				1,094				923
	Income before income taxes		$	8,613			$	2,041			$	2,579
	The (benefit from) provision for income taxes consists of the following:
			Year Ended December 31,
			2014				2013				2012
			(in thousands)
	Current
	Federal		$	—			$	(40	)		$	(18	)
	State		317				154				202
	Foreign		651				452				147
	Total current provision		968				566				331
	Deferred
	Federal		$	(22,184	)		$	6			$	27
	State		(433		)		—				—
	Foreign		18				(72		)		—
	Total deferred provision (benefit)		(22,599		)		(66		)		27
	Total (benefit from) provision for income taxes		$	(21,631	)		$	500			$	358
	The reconciliation of the statutory federal income tax rate to the Company’s effective tax rate is as follows:
			Year Ended December 31,
			2014			2013			2012
	Federal statutory rate		35	%		34	%		34	%
	State taxes		1.4			5.1			5.5
	Stock-based compensation		1.3			9.1			22.9
	Foreign source income		3.9			1.9			(3.5	)
	Change in valuation allowance		(270.5	)		(28.4	)		(47.9	)
	Incremental federal rate benefit previously not recognized		(7.0	)		—			—
	Federal and state research and development credit		(11.3	)		—			—
	Other		(3.9	)		2.8			2.9
	(Benefit from) provision for income taxes		(251.1	)%		24.5	%		13.9	%
	Deferred income taxes reflect the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The components of the Company’s deferred tax assets and liabilities are as follows:
			December 31,
			2014				2013
			(in thousands)
	Deferred tax assets
	Net operating loss carryforwards		$	12,849			$	18,895
	Research and development credit carryforwards		6,392				5,189
	Accrued liabilities		583				581
	Deferred revenues		3,291				3,188
	Deferred rent		191				210
	Intangible assets		401				440
	Stock-based compensation		4,149				1,714
	Other		903				521
	Gross deferred tax assets		28,759				30,738
	Valuation allowance		(3,079		)		(27,181		)
	Net deferred tax assets		25,680				3,557
	Deferred tax liabilities
	Fixed assets		(3,039		)		(3,483		)
	Intangible assets		(2		)		(34		)
	Total deferred tax liabilities		(3,041		)		(3,517		)
	Net deferred tax assets		$	22,639			$	40
	Current and non-current deferred tax assets and liabilities included in the consolidated balance sheets are recorded as follows:
			December 31,
			2014				2013
			(in thousands)
	Current deferred tax assets		$	8,520			$	114
	Current deferred tax liabilities		—				—
	Noncurrent deferred tax assets		14,119				72
Noncurrent deferred tax liabilities		—				(146		)
Net deferred tax assets		$	22,639			$	40
Realization of deferred tax assets is dependent upon future earnings, if any, and the timing and amount of such assets are uncertain. Prior to the fourth quarter of 2014, the Company had provided a valuation allowance for its U.S. federal and state deferred tax assets that it believed were not more likely than not realizable. Management determined that the objective and verifiable negative evidence, such as relatively low U.S. operating income and uncertainty of sustaining or growing future operating profits, continued to outweigh positive evidence that would be necessary to reduce the valuation allowance.
In the fourth quarter of 2014, the Company recorded a $23.7 million tax benefit for the recognition of its U.S. federal and certain state deferred tax assets, primarily due to the increased and expected sustainable profitability in its U.S. operations. In reaching this conclusion, management considered the Company's increasing realized profitability in the fourth quarter of 2014, forecasted future profitability, its ability to better absorb uncertainties in future profits, and the cumulative effect of changes in the current macro-economic environment surrounding the IT security industry, which ultimately resulted in increased demand for its solutions.
The Company believes it is more likely than not that its California deferred tax assets will not be realized because the income attributed to California is not expected to be sufficient to recognize these deferred tax assets. Accordingly, the Company continues to record the valuation allowance of $3.1 million as of December 31, 2014 for its California deferred tax assets During the year ended December 31, 2013, the valuation allowance had increased by $0.9 million to $27.2 million.
At December 31, 2014, the Company had federal and state net operating loss carryforwards of approximately $56.7 million and $10.5 million respectively, available to reduce federal and state taxable income. The excess tax benefits included in net operating loss carryforwards but not reflected in deferred tax assets for federal and state are $21.4 million and $1.7 million, respectively. The Company’s federal net operating losses expire in the years 2021 to 2034, and its state net operating losses expire from 2015 to 2034. Utilization of the Company’s net operating loss carryforwards may be subject to a substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code and similar state provisions. Such an annual limitation could result in the expiration of the net operating loss carryforwards before utilization. As of December 31, 2014, the Company had federal and state research and development credits of $5.0 million and $5.2 million, respectively. Federal research and development credits expire in the years 2022 to 2034. State research and development credits do not expire.
U.S. income taxes were not provided on undistributed earnings from investments in non-U.S. subsidiaries as the Company intends to continue to reinvest the earnings of these foreign subsidiaries indefinitely. The Company’s share of undistributed earnings of foreign subsidiaries that could be subject to additional U.S. income tax if remitted was approximately $6.8 million and $8.5 million as of December 31, 2014 and 2013, respectively. Determination of the amount of unrecognized deferred tax liability for temporary differences related to investments in these non-U.S. subsidiaries that are essentially permanent in duration is not practicable.
The evaluation of a tax position is a two-step process. The first step requires the Company to determine whether it is more likely than not that a tax position will be sustained upon examination based on the technical merits of the position. The second step requires the Company to recognize in the financial statement each tax position that meets the more likely than not criteria, measured at the amount of benefit that has a greater than fifty percent likelihood of being realized.
A reconciliation of the Company’s unrecognized tax benefits is as follows:
		Year Ended December 31,
		2014				2013				2012
		(in thousands)
Unrecognized tax benefits beginning balance		$	3,255			$	2,647			$	2,792
Gross increase for tax positions of prior years		—				241				—
Gross decrease for tax positions of prior years		(127		)		—				(46		)
Gross increase for tax positions of current year		332				446				140
Settlements		—				—				(106		)
Lapse of statute of limitations		(130		)		(79		)		(133		)
Total unrecognized tax benefits		$	3,330			$	3,255			$	2,647
The unrecognized tax benefits, if recognized, would impact the income tax provision by $2.1 million, $1.0 million and $1.0 million as of December 31, 2014, 2013 and 2012, respectively.
The Company has elected to include interest and penalties as a component of income tax expense. The amounts were not material for 2014, 2013 and 2012.
The Company files income tax returns in the United States, including various state jurisdictions. The Company’s subsidiaries file tax returns in various foreign jurisdictions. The tax years 2009 to 2014 remain open to examination by the major taxing jurisdictions in which the Company is subject to tax, with the exception of France which remains open to examination for the 2012 through 2014 tax years only. As of December 31, 2014, the Company was not under examination by the Internal Revenue Service or any state tax jurisdictions.
A one-year retroactive extension of the research credit from January 1, 2014 through December 31, 2014 was signed into law on December 19, 2014 in accordance with the Tax Increase Prevention Act of 2014. On January 2, 2013, the American Taxpayer Relief Act of 2012 (H.R. 8) was signed into law which retroactively extended the federal research and development credit from January 1, 2012 through December 31, 2013.

Segment_Information_and_Inform

Segment Information and Information about Geographic Area	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information and Information about Geographic Area
	NOTE 11.	Segment Information and Information about Geographic Area
	The Company operates in one segment. The Company’s chief operating decision maker is the Chairman, President and Chief Executive Officer, who makes operating decisions, assesses performance and allocates resources on a consolidated basis. All of the Company’s principal operations and decision-making functions are located in the United States. Revenues by geographic area, based on the location of the customer, are as follows:
			Year Ended December 31,
			2014		2013		2012
			(in thousands)
	United States		$	93,425	$	75,485	$	62,616
	Other		40,154		32,477		28,804
	Total revenues		$	133,579	$	107,962	$	91,420
	Property and equipment, net, by geographic area, are as follows:
			December 31,
			2014		2013
			(in thousands)
	United States		$	23,650	$	19,909
	Other		2,968		3,166
	Total property and equipment, net		$	26,618	$	23,075

Net_Income_Per_Share_Attributa

Net Income Per Share Attributable to Common Stockholders	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Income Per Share Attributable to Common Stockholders
	NOTE 12.	Net Income Per Share Attributable to Common Stockholders
	The computations for basic and diluted net income per share attributable to common stockholders are as follows:
			Year Ended December 31,
			2014			2013			2012
			(in thousands, except per share data)
	Numerator:
	Net income		$	30,244		$	1,541		$	2,221
	Net income attributable to participating securities		—			(2		)	(1,172		)
	Net income attributable to common stockholders - basic		30,244			1,539			1,049
	Undistributed earnings reallocated to participating securities		—			—			1,201
	Net income attributable to common stockholders - diluted		$	30,244		$	1,539		$	2,250
	Denominator:
	Weighted-average shares used in computing net income per share attributable to common stockholders - basic		32,979			31,914			11,891
	Effect of potentially dilutive securities:
	Convertible preferred stock		—			—			13,270
	Common stock options		4,191			4,059			3,187
	Contingently issuable shares related to an acquisition		—			—			4
	Weighted-average shares used in computing net income per share attributable to common stockholders - diluted		37,170			35,973			28,352
	Net income per share attributable to common stockholders
	Basic		$	0.92		$	0.05		$	0.09
	Diluted		$	0.81		$	0.04		$	0.08
	Potentially dilutive securities not included in the calculation of diluted net income per share because doing so would be antidilutive are as follows:
			Year Ended December 31,
			2014		2013			2012
			(in thousands)
	Common stock options		1,689		952			772

Quarterly_Financial_Informatio

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)
	NOTE 13.	Quarterly Financial Information (Unaudited)
	The following table sets forth unaudited consolidated statements of operations data for each of the quarters in the two-year period ended December 31, 2014. The unaudited quarterly consolidated statements of operations data set forth below have been prepared on the same basis as the audited consolidated financial statements included elsewhere in this Annual Report on Form 10-K and, in the opinion of management, reflect all necessary adjustments, which consist only of normal recurring adjustments, necessary for a fair presentation of such data. Historical results are not necessarily indicative of the results for the full year or any other period. This data should be read together with the consolidated financial statements and the related notes included elsewhere in this Annual Report on Form 10-K.
			Three Months Ended
			Mar. 31,			Jun. 30,		Sep. 30, 2013		Dec. 31, 2013			Mar. 31,			Jun. 30,		Sep. 30, 2014			Dec. 31, 2014
			2013			2013							2014			2014
			(unaudited)
			(in thousands, except per share data)
	Revenues		$	24,883		$	26,291	$	27,749	$	29,039		$	30,356		$	32,302	$	34,348		$	36,573
	Cost of revenues		5,795			5,924		6,415		6,526			6,846			7,175		7,421			7,521
	Gross profit		19,088			20,367		21,334		22,513			23,510			25,127		26,927			29,052
	Operating expenses:
	Research and development		5,297			5,291		5,151		5,939			6,404			6,411		6,490			7,015
	Sales and marketing		10,168			10,160		10,411		11,784			12,492			11,845		11,774			11,938
	General and administrative		3,896			4,053		4,277		4,566			4,875			5,081		5,156			5,888
	Total operating expenses		19,361			19,504		19,839		22,289			23,771			23,337		23,420			24,841
	Income (loss) from operations		(273		)	863		1,495		224			(261		)	1,790		3,507			4,211
	Other income (expense), net(2)		(270		)	51		12		(61		)	12			41		(119		)	(568		)
	Income (loss) before income taxes (2)		(543		)	914		1,507		163			(249		)	1,831		3,388			3,643
	Provision for (benefit from) income taxes(1)		70			92		210		128			182			174		283			(22,270		)
	Net income (loss) (2)		$	(613	)	$	822	$	1,297	$	35		$	(431	)	$	1,657	$	3,105		$	25,913
	Net income (loss) attributable to common stockholders		$	(613	)	$	821	$	1,295	$	35		$	(431	)	$	1,657	$	3,105		$	25,913
	Net income (loss) per share attributable to common stockholders:
	Basic (2)		$	(0.02	)	$	0.03	$	0.04	$	0		$	(0.01	)	$	0.05	$	0.09		$	0.77
	Diluted (2)		$	(0.02	)	$	0.02	$	0.04	$	0		$	(0.01	)	$	0.04	$	0.08		$	0.69
	(1) Provision for income taxes consists primarily of taxes on income in foreign jurisdictions and state income taxes in the U.S. In the fourth quarter of 2014, the Company recorded a tax benefit of $23.7 million to recognize its U.S. federal and certain state deferred tax assets.
	(2) Other income (expense), income (loss) before income taxes, net income (loss), net income (loss) attributable to common stockholders and net income (loss) per share have been adjusted for an immaterial error as further described in Note 1 to the consolidated financial statements.

Schedule_II_Schedule_of_Valuat

Schedule II Schedule of Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Schedule II Schedule of Valuation and Qualifying Accounts	SCHEDULE II
	SUPPLEMENTARY CONSOLIDATED FINANCIAL STATEMENT SCHEDULE
	VALUATION AND QUALIFYING ACCOUNTS
	(in thousands)
				Additions
		Balance at Beginning of Year		Charged to Costs and Expenses		Deductions and Other (1)			Balance at End of Year
	Allowance for Doubtful Accounts
	Year ended December 31, 2014	$	389	$	470	$	(269	)	$	590
	Year ended December 31, 2013	$	331	$	307	$	(249	)	$	389
	Year ended December 31, 2012	$	230	$	218	$	(117	)	$	331
	(1) Primarily represents write-offs of uncollectible accounts, net of recoveries.

The_Company_and_Summary_of_Sig1

The Company and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Description of Business	Description of Business
	Qualys, Inc. (the “Company”) was incorporated in the state of Delaware on December 30, 1999. The Company is headquartered in Redwood City, California and has majority-owned subsidiaries throughout the world. The Company is a pioneer and leading provider of cloud security and compliance solutions that enable organizations to identify security risks to their IT infrastructures, help protect their IT systems and applications from ever-evolving cyber attacks and achieve compliance with internal policies and external regulations. The Company’s cloud solutions address the growing security and compliance complexities and risks that are amplified by the dissolving boundaries between internal and external IT infrastructures and web environments, the rapid adoption of cloud computing and the proliferation of geographically dispersed IT assets. Organizations can use the Company’s integrated suite of solutions delivered on its QualysGuard Cloud Platform to cost-effectively obtain a unified view of their security and compliance posture across globally-distributed IT infrastructures.
Initial Public Offering	Initial Public Offering
	On October 3, 2012, the Company closed its initial public offering ("IPO") of 8,711,250 shares of common stock at an offering price of $12.00 per share. The offering included 7,836,250 shares sold and issued by the Company and 875,000 shares sold by selling stockholders. The shares sold in the offering included 1,136,250 shares sold by the Company pursuant to the underwriters’ full exercise of their over-allotment option. The net proceeds to the Company from the offering were approximately $87.5 million after deducting underwriting discounts and commissions, and before deducting total expenses in connection with this offering of $2.9 million. Immediately prior to the closing, all of the Company’s 17,597,258 outstanding shares of convertible preferred stock converted into an equivalent number of shares of common stock. The related carrying value of the convertible preferred stock of $63.9 million was reclassified to common stock and additional paid-in capital at the time of the conversion.
Basis of presentation	Basis of Presentation
	The accompanying consolidated financial statements and footnotes have been prepared by the Company in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) as well as the instructions to Form 10-K and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). In the opinion of management, the accompanying consolidated financial statements include all adjustments necessary for the fair presentation of the Company’s consolidated financial position, results of operations and cash flows for the periods presented. The accompanying consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries. All significant intercompany transactions and balances have been eliminated upon consolidation.
	Certain prior year amounts related to income taxes have been reclassified to conform to the current year presentation. These reclassifications did not change previously reported total assets, liabilities, convertible preferred stock, stockholders' equity (deficit), income from operations or net income.
Correction of Immaterial Error	Correction of Immaterial Error
	During the fourth quarter of 2014, the Company identified an immaterial error in the financial statements of its foreign subsidiaries reporting in the applicable local foreign currencies as their functional currencies, resulting in translation adjustments included as a component of accumulated other comprehensive income (loss) in stockholders' equity. It was determined that the functional currency for the Company's local subsidiaries should be the U.S. dollar. Accordingly, remeasurement gains and losses on monetary assets and liabilities denominated in foreign currencies should be recorded to foreign exchange gains and losses in other income (expense) in the consolidated statements of operations in accordance with GAAP.
	The Company reviewed the accounting error utilizing SEC Staff Accounting Bulletin No. 99, “Materiality” and SEC Staff Accounting Bulletin No. 108, “Effects of Prior Year Misstatements on Current Year Financial Statements.” Management evaluated the materiality of this error from a qualitative and quantitative perspective and determined the impact of the errors did not have a material impact on any individual prior period presentation or affect the trend of financial results. However, because the adjustment to correct the cumulative error on the consolidated balance sheets and statements of stockholders' equity would have had a material effect to the Company's consolidated statements of operations for the year ended December 31, 2014, the Company has revised its previously reported financial statements for the 2012 and 2013 annual periods to reflect the impact of the immaterial errors that have been corrected.
	The following table summarizes the correction of previously reported amounts presented in the accompanying consolidated financial statements (in thousands, expect per share data):
		Year Ended December 31,
		2013						2012
		as reported			as adjusted			as reported			as adjusted
	Consolidated Statements of Operations:
	Other income (expense), net	$	(517	)	$	(600	)	$	(188	)	$	(247	)
	Total other income (expense), net	(185		)	(268		)	(366		)	(425		)
	Net income	1,624			1,541			2,280			2,221
	Net income per share attributable to common stockholders:
	Basic	0.05			0.05			0.09			0.09
	Diluted	0.05			0.04			0.08			0.08
	Consolidated Statements of Comprehensive Income:
	Change in foreign currency translation gain (loss), net of zero tax	(83		)	—			(59		)	—
	Comprehensive Income	1,571			1,571			2,229			2,229
	Consolidated Statements of Cash Flows:
	Net cash provided by operating activities	25,146			25,081			21,952			21,924
	Net cash used in investing activities	(20,688		)	(20,675		)	(94,784		)	(94,796		)
	Effect of exchange rate changes on cash and cash equivalents	(51		)	1			(33		)	7
	Net increase in cash and cash equivalents	7,484			7,484			10,337			10,337
		December 31,
		2013						2012
		as reported			as adjusted			as reported			as adjusted
	Consolidated Balance Sheets:
	Accumulated other comprehensive income (loss)	$	(1,088	)	$	38		$	(1,035	)	$	8
	Accumulated deficit	(72,468		)	(73,594		)	(74,092		)	(75,135		)
	Total stockholders' equity	103,117			103,117			91,555			91,555
		December 31,
		2013						2012						2011
		as reported			as adjusted			as reported			as adjusted			as reported			as adjusted
	Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit):
	Accumulated other comprehensive income (loss)	$	(1,088	)	$	38		$	(1,035	)	$	8		$	(984	)	$	—
	Accumulated deficit	(72,468		)	(73,594		)	(74,092		)	(75,135		)	(76,372		)	(77,356		)
	Total stockholders' equity (deficit)	103,117			103,117			91,555			91,555			(64,424		)	(64,424		)
Use of estimates	Use of Estimates
	The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported results of operations during the reporting period. The Company’s management regularly assesses these estimates, which primarily affect revenue recognition, the valuation of accounts receivable, goodwill and intangible assets, common stock, stock-based compensation and the valuation allowances associated with deferred tax assets. Actual results could differ from those estimates and such differences may be material to the accompanying consolidated financial statements.
Concentration of credit risk	Concentration of Credit Risk
	The Company invests its cash and cash equivalents with major financial institutions. Cash balances with any one institution at times may be in excess of federally insured limits. Cash equivalents are invested in high-quality investment grade financial instruments and are diversified. The Company has not experienced any losses in such accounts and believes it is not exposed to any significant credit risk.
	Credit risk with respect to accounts receivable is dispersed due to the large number of customers. In addition, the Company’s credit risk is mitigated by the relatively short collection period. Collateral is not required for accounts receivable. The Company maintains an allowance for potential credit losses based upon the expected collectability of accounts receivable. The Company writes off its receivables when collectability is deemed to be doubtful. As of December 31, 2014 and 2013, no customer or channel partner accounted for more than 10% of the Company's accounts receivable balance.
Cash, cash equivalents and short-term and long-term investments	Cash, Cash Equivalents, Short-Term and Long-Term Investments
	Cash and cash equivalents include cash held in banks and highly liquid money market funds, commercial paper, and fixed-income U.S. government agency securities, all with original maturities of three months or less when acquired. The Company’s investments consist of fixed-income U.S. government agency securities, corporate bonds, municipal bonds, asset-backed securities and commercial paper. Management determines the appropriate classification of the Company's investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company classifies its investments as either short-term or long-term based on each instrument's underlying contractual maturity date.
	Cash equivalents are stated at cost, which approximates fair market value. Short-term and long-term investments are classified as available-for-sale and are carried at fair value. Unrealized gains and losses in fair value are reported in other comprehensive income (loss). When the available-for-sale securities are sold, cost is based on the specific identification method, and the realized gains and losses are included in other income (expense) in the consolidated statements of operations. Short-term and long-term investments are reviewed quarterly for impairment that is deemed to be other-than-temporary. An investment is considered other-than-temporarily impaired when its fair value is below its amortized cost and (1) there is an intent to sell the security, (2) it is “more likely than not” that the security will be sold before recovery of its amortized cost basis or (3) the present value of expected cash flows from the investment is not expected to recover the entire amortized cost basis. Declines in value that are considered to be other-than-temporary and adjustments to amortized cost for the amortization of premiums and the accretion of discounts are recorded in other income (expense). Interest and dividends are recorded in interest income as earned.
Accounts receivable	Accounts Receivable
	Accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts represents the Company’s best estimate of the amount of probable credit losses and is determined based on a review of existing accounts receivable by aging category to identify significant customers or invoices with collectability issues. For those invoices not specifically reviewed, the reserve is calculated based on the age of the receivable.
	Any change in the assumptions used in analyzing a specific account receivable may result in an additional provision for doubtful accounts being recognized in the period in which the change occurs. When the Company ultimately concludes that a receivable is uncollectible, the balance is written off against the allowance for doubtful accounts. Payments subsequently received on such receivables are credited back to the allowance for doubtful accounts.
Property and equipment, net	Property and Equipment, net
	Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which range from three to five years. Leasehold improvements are amortized on a straight-line basis over the lesser of the estimated useful life of the asset or the lease term. Property under capital lease is amortized over the term of the respective lease or the estimated useful life of the asset, whichever is shorter.
	The Company purchases physical scanner appliances and other computer equipment that are provided on a subscription basis. This equipment is recorded within property and equipment on the accompanying consolidated balance sheet, and the depreciation is recorded to cost of revenues over an estimated useful life of three years.
	Upon retirement or disposal, the cost of assets and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations. Repairs and maintenance that do not extend the life of an asset are expensed as incurred and major improvements are capitalized as property and equipment.
Impairment of long-lived assets	Impairment of Long-Lived Assets
	The Company evaluates its long-lived assets, which consist of property and equipment, and intangible assets subject to amortization, for indicators of possible impairment when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if the carrying amounts of such assets exceed the estimates of future undiscounted cash flows expected to be generated by such assets. Should an impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s estimated fair value. As of December 31, 2014 and 2013, the Company has not written down any of its long-lived assets as a result of impairment.
Goodwill and intangible assets	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination and is not subject to amortization. Goodwill and other intangible assets with indefinite lives are not amortized, but tested for impairment annually or if certain circumstances indicate a possible impairment may exist. These tests are performed at the reporting unit level. The Company’s operations are organized as one reporting unit.
	In testing for a potential impairment of goodwill, the Company first performs a qualitative assessment of its reporting unit to determine if it is more likely than not (a more than 50% likelihood) that the fair value of the reporting unit is less than its carrying amount. If the fair value is not considered to be less than the carrying amount, no further evaluation is necessary. The Company performed the annual qualitative assessment for the year ended December 31, 2014 and concluded there was no impairment of goodwill.
	In testing for a potential impairment of intangible assets with indefinite lives that are not subject to amortization, the Company first performs a qualitative assessment to determine if it is more likely than not (a more than 50% likelihood) that the fair value of the indefinite-lived intangible assets is less than the carrying amount. If the fair value is not considered to be less than the carrying amount, no further evaluation is necessary. The Company performed the annual qualitative assessment as of December 31, 2014 and concluded there was no impairment of the indefinite-lived intangible assets.
	If the qualitative assessment indicates there is more than a 50% likelihood that the fair value is less than the carrying amount, the Company would perform a two-step test. In the first step, the carrying value of the reporting unit or intangible asset is compared to its estimated fair value. If the estimated fair value is less than the carrying value, then potential impairment exists. In the second step, for goodwill, the Company calculates the amount of any impairment by determining the implied fair value of goodwill using a hypothetical purchase price allocation, similar to that which would be applied if it were an acquisition and the purchase price was equivalent to fair value as calculated in the first step. Impairment is equivalent to any excess of goodwill carrying value over its implied fair value. For indefinite-lived intangible assets, the Company performs the currently prescribed quantitative impairment test by comparing the fair value of the indefinite-lived intangible asset with its carrying value.
	Certain other intangible assets acquired are amortized over their estimated useful lives and tested for impairment if certain circumstances indicate an impairment may exist. The Company’s intangible assets are comprised primarily of existing technology, patent license, and non-competition agreements and are amortized over periods ranging from three to fourteen years on a straight-line basis.
Software development cost	Software Development Costs
	The Company capitalizes qualifying software costs developed or obtained for internal use. These costs generally include internal costs, such as payroll and benefits of those employees directly associated with the development of the software, and other consulting expenses. During the year ended December 31, 2014, the Company capitalized software development costs of $0.1 million. No costs were capitalized during the year ended December 31, 2013. Total capitalized development costs are $0.4 million and $0.3 million at December 31, 2014 and 2013, respectively, and the related accumulated amortization is $0.3 million at both December 31, 2014 and 2013.
Derivative financial instruments	Derivative Financial Instruments
	Derivative financial instruments are utilized by the Company to reduce foreign currency exchange risks. The Company uses foreign currency forward contracts to mitigate the impact of foreign currency fluctuations of certain non-U.S. dollar denominated asset positions, primarily cash and accounts receivable. These contracts are recorded within prepaid expenses and other current assets in the consolidated balance sheets. Gains and losses resulting from currency exchange rate movements on these forward contracts are recognized in other income (expense) in the accompanying consolidated statements of operations in the period in which the exchange rates change and offset the foreign currency gains and losses on the underlying exposure being hedged. The Company does not enter into derivative financial instruments for trading or speculative purposes.
	At December 31, 2014, the Company had two outstanding forward contracts with notional amounts of 6.0 million Euros and 2.1 million British Pounds, which expired on on January 31, 2015. At December 31, 2013, the Company had two outstanding forward contracts with notional amounts of 6.3 million Euros and 2.0 million British Pounds, which expired on January 31, 2014. These forward contracts were entered into as of December 31, 2014 and 2013, respectively, and thus the fair value of the contracts was $0 at both December 31, 2014 and 2013. In 2014, the Company recorded a net gain of $0.7 million from forward contracts, which was offset by foreign currency transaction losses of $1.4 million for the year. In 2013, the Company recorded a net loss of $0.8 million from forward contracts, which was partially offset by foreign currency transaction gains of $0.2 million for the year. These derivatives did not meet the criteria to be designated as hedges.
Share-based compensation	Stock-Based Compensation
	The Company recognizes stock-based compensation expense for its employee stock options over the requisite service period for awards of equity instruments based on the grant-date fair value of those awards expected to vest. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs materially from original estimates.
	Option grants to non-employees are accounted for at the fair value of the equity instrument issued, as calculated using the Black-Scholes option-pricing model and the expense is recognized over the vesting periods of the options.
Revenue recognition	Revenue Recognition
	The Company derives revenues from subscriptions that require customers to pay a fee in order to access the Company’s cloud solutions. Customers generally enter into one year renewable subscriptions. The subscription fee entitles the customer to an unlimited number of scans for a specified number of networked devices or web applications and, if requested by a customer as part of their subscription, a specified number of physical or virtual scanner appliances. The Company’s physical and virtual scanner appliances are requested by certain customers as part of their subscriptions in order to scan IT infrastructures within their firewalls and do not function without, and are not sold separately from, subscriptions for the Company’s solutions. In some limited cases, the Company also provides certain computer equipment used to extend its QualysGuard Cloud Platform into its customers’ private cloud environment. Customers are required to return physical scanner appliances and computer equipment if they do not renew their subscriptions.
	The Company recognizes revenues when all of the following conditions are met:
	•	There is persuasive evidence of an arrangement.
	•	The service has been provided to the customer.
	•	The collection of the fees is reasonably assured.
	•	The amount of fees to be paid by the customer is fixed or determinable.
	Subscriptions are recognized ratably over the subscription period. The Company recognizes revenues from subscriptions that include physical scanner appliances and other computer equipment ratably over the period of the subscription. Because the customer’s access to the Company’s cloud solutions are delivered at the same time as or within close proximity to the delivery of physical scanner appliances and the terms are commensurate for these services and equipment, the Company considers these elements as a single unit of accounting recognized ratably over the subscription period.
	Deferred revenues consist of revenues billed or received that will be recognized in the future under subscriptions existing at the balance sheet date. The current portion of deferred revenues represents amounts that are expected to be recognized within one year of the balance sheet date.
	Costs of shipping and handling charges incurred by the Company associated with physical scanner appliances and other computer equipment are included in cost of revenues.
	Sales taxes and other taxes collected from customers to be remitted to government authorities are excluded from revenues.
Advertising expenses	Advertising Expenses
	Advertising costs are expensed as incurred and include costs of advertising, trade show costs and promotional materials. The Company incurred advertising costs of $5.3 million, $4.2 million, and $4.3 million for 2014, 2013 and 2012, respectively.
Income taxes	Income Taxes
	The Company uses the asset and liability method to account for income taxes. Under this method, deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities. Deferred tax assets and liabilities are measured using statutory tax rates and laws that will be in effect when the differences are expected to reverse. A valuation allowance is established, when necessary, to reduce deferred tax assets to the amount expected to be realized.
	The Company operates in various tax jurisdictions and is subject to audit by various tax authorities. Tax positions are based upon their technical merits, relevant tax law and the specific facts and circumstances as of each reporting period. Changes in facts and circumstances could result in material changes to the amounts recorded for such tax positions. A tax position is only recognized in the financial statements if it is “more likely than not” to be sustained based solely on its technical merits as of the reporting date. The Company considers many factors when evaluating and estimating its tax positions and tax benefits, which may require periodic adjustments that could result in recognition of additional tax benefits or additional charges to the tax provision and may not accurately reflect the actual outcomes. The Company’s policy is to recognize interest and penalties relating to unrecognized tax benefits as a component of the provision for income taxes.
Other comprehensive income (loss)	Other Comprehensive Income (Loss)
	Other comprehensive income (loss) consists of unrealized gains (losses) on available-for-sale investments, net of tax, which are not included in the Company’s net income. Total comprehensive income includes net income and other comprehensive income (loss) and is included in the consolidated statements of comprehensive income.
Foreign currency translation and transactions	Foreign Currency Transactions
	The Company’s operations are conducted in various countries around the world and the financial statements of its foreign subsidiaries are reported in the U.S. dollar as their respective functional currency. Monetary assets and liabilities denominated in foreign currencies have been remeasured into U.S. dollars using the exchange rates in effect at the balance sheet date, and income and expenses are remeasured at average exchange rates during the period. Foreign currency remeasurement gains and losses and foreign currency transaction gains and losses are recognized in other income (expense), net. The Company recorded total foreign currency transaction losses of $(0.7) million, $(0.7) million and $(0.2) million during 2014, 2013 and 2012, respectively.
Fair value measurement	Fair Value Measurements
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For certain of the Company’s financial instruments, including certain cash equivalents, accounts receivable, accounts payable, and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances.
	The Company measures and reports certain cash equivalents, investments and derivative foreign currency forward contracts at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy is broken down into three levels based on the reliability of inputs as follows:
	Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities.
	Level 2—Valuations based on other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3—Valuations based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability.
	The Company's financial instruments consist of assets measured using Level 1 and 2 inputs. Level 1 assets include a highly liquid money market fund, which is valued using unadjusted quoted prices that are available in an active market for an identical asset. Level 2 assets include fixed-income U.S. government agency securities, commercial paper, corporate bonds, municipal bonds and asset-backed securities and derivative financial instruments consisting of foreign currency forward contracts. The securities, bonds and commercial paper are valued using prices from independent pricing services based on quoted prices in active markets for similar instruments or on industry models using data inputs such as interest rates and prices that can be directly observed or corroborated in active markets. The foreign currency forward contracts are valued using observable inputs, such as quotations on forward foreign exchange points and foreign interest rates. See Note 2 for more information regarding the fair value measurement of the Company's financial instruments.
Net income per share attributable to common stockholders	Net Income Per Share Attributable to Common Stockholders
	The Company computes net income attributable to common stockholders using the two-class method required for participating securities. Convertible preferred stock and common stock subject to repurchase resulting from the early exercise of stock options are considered to be participating securities since they contain non-forfeitable rights to dividends or dividend equivalents in the event the Company declares a dividend for common stock. In accordance with the two-class method, earnings allocated to these participating securities are subtracted from net income after deducting preferred stock dividends, if any, to determine total undistributed earnings to be allocated to common stockholders. The holders of convertible preferred stock did not have a contractual obligation to share in net losses and such shares were excluded from the computation of basic earnings per share in periods of net loss.
	Basic net income per share attributable to common stockholders is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. All participating securities are excluded from basic weighted average common shares outstanding. In computing diluted net income attributable to common stockholders, undistributed earnings are reallocated to reflect the potential impact of dilutive securities. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, adjusted for the effects of potentially dilutive common shares, which comprise outstanding stock options, warrants, convertible preferred stock and contingently issuable shares related to an acquisition. The dilutive potential common shares are computed using the treasury stock method or the as-if converted method, as applicable. The effects of outstanding stock options, warrants, convertible preferred stock and contingently issuable shares related to an acquisition are excluded from the computation of diluted net income per common share in periods in which the effect would be antidilutive.
Recent accounting pronouncements	Recent Accounting Pronouncements
	Under the Jumpstart Our Business Startups Act (the "JOBS Act"), the Company meets the definition of an “emerging growth company.” The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. As a result, the Company will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required from non-emerging growth companies.
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standard Update (“ASU”) that provides guidance on the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. An unrecognized tax benefit should be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward when settlement in this manner is available under the tax law. The Company adopted this standard in 2014 and the adoption of this standard did not have a material impact on the consolidated financial statements.
	In May 2014, the FASB issued an ASU amending revenue recognition guidance and requiring more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The guidance is effective for annual and interim reporting periods beginning after December 15, 2016, with early adoption prohibited. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements.
	In January 2015, the FASB issued an ASU eliminating from U.S. GAAP the concept of extraordinary items, which required that an entity separately classify, present, and disclose extraordinary events and transactions. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. A reporting entity may apply the amendments prospectively or retrospectively to all prior periods presented in the financial statements. Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements.
Reverse stock split	Reverse Stock Split
	In September 2012, the Company’s board of directors and stockholders approved an amendment to the Company’s amended and restated certificate of incorporation effecting a one-for-ten reverse stock split of the Company’s issued and outstanding shares of common and convertible preferred stock. The par value of the common and convertible preferred stock was not adjusted as a result of the reverse stock split. All issued and outstanding common stock, convertible preferred stock, warrants for convertible preferred stock, options for common stock, contingently issuable shares of common stock and per share amounts contained in the Company’s consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented.

The_Company_and_Summary_of_Sig2

The Company and Summary of Significant Accounting Policies The Company and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Revisions and Reclassifications	The following table summarizes the correction of previously reported amounts presented in the accompanying consolidated financial statements (in thousands, expect per share data):
		Year Ended December 31,
		2013						2012
		as reported			as adjusted			as reported			as adjusted
	Consolidated Statements of Operations:
	Other income (expense), net	$	(517	)	$	(600	)	$	(188	)	$	(247	)
	Total other income (expense), net	(185		)	(268		)	(366		)	(425		)
	Net income	1,624			1,541			2,280			2,221
	Net income per share attributable to common stockholders:
	Basic	0.05			0.05			0.09			0.09
	Diluted	0.05			0.04			0.08			0.08
	Consolidated Statements of Comprehensive Income:
	Change in foreign currency translation gain (loss), net of zero tax	(83		)	—			(59		)	—
	Comprehensive Income	1,571			1,571			2,229			2,229
	Consolidated Statements of Cash Flows:
	Net cash provided by operating activities	25,146			25,081			21,952			21,924
	Net cash used in investing activities	(20,688		)	(20,675		)	(94,784		)	(94,796		)
	Effect of exchange rate changes on cash and cash equivalents	(51		)	1			(33		)	7
	Net increase in cash and cash equivalents	7,484			7,484			10,337			10,337
		December 31,
		2013						2012
		as reported			as adjusted			as reported			as adjusted
	Consolidated Balance Sheets:
	Accumulated other comprehensive income (loss)	$	(1,088	)	$	38		$	(1,035	)	$	8
	Accumulated deficit	(72,468		)	(73,594		)	(74,092		)	(75,135		)
	Total stockholders' equity	103,117			103,117			91,555			91,555
		December 31,
		2013						2012						2011
		as reported			as adjusted			as reported			as adjusted			as reported			as adjusted
	Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit):
	Accumulated other comprehensive income (loss)	$	(1,088	)	$	38		$	(1,035	)	$	8		$	(984	)	$	—
	Accumulated deficit	(72,468		)	(73,594		)	(74,092		)	(75,135		)	(76,372		)	(77,356		)
	Total stockholders' equity (deficit)	103,117			103,117			91,555			91,555			(64,424		)	(64,424		)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Cash and Cash Equivalents, Available-for-sale Securities Reconciliation	The Company's cash and cash equivalents, short-term investments, and long-term investments consist of the following:
		31-Dec-14
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
		(in thousands)
	Cash and cash equivalents:
	Cash	$	36,024	$	—	$	—		$	36,024
	Money market funds	39,180		—		—			39,180
	U.S. government agencies	300		—		—			300
	Commercial paper	1,000		—		—			1,000
	Total	76,504		—		—			76,504
	Short-term investments:
	Commercial paper	4,998		1		—			4,999
	Corporate bonds	12,438		6		(6		)	12,438
	U.S. government agencies	33,280		3		(6		)	33,277
	Total	50,716		10		(12		)	50,714
	Long-term investments:
	Asset-backed securities	16,092		5		(3		)	16,094
	U.S. government agencies	20,243		22		(10		)	20,255
	Corporate bonds	3,101		—		(2		)	3,099
	Total	39,436		27		(15		)	39,448
	Total	$	166,656	$	37	$	(27	)	$	166,666
		31-Dec-13
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
		(in thousands)
	Cash and cash equivalents:
	Cash	$	27,488	$	—	$	—		$	27,488
	Money market funds	183		—		—			183
	Commercial paper	14,697		1		—			14,698
	Total	42,368		1		—			42,369
	Short-term investments:
	Commercial paper	32,784		6		—			32,790
	Corporate bonds	16,894		11		—			16,905
	Municipal bonds	1,128		—		—			1,128
	U.S. government agencies	4,004		—		—			4,004
	Total	54,810		17		—			54,827
	Long-term investments:
	Asset-backed securities	5,497		4		—			5,501
	U.S. government agencies	14,835		1		(3		)	14,833
	Corporate bonds	15,256		22		(4		)	15,274
	Total	35,588		27		(7		)	35,608
	Total	$	132,766	$	45	$	(7	)	$	132,804
Schedule of Assets Measured on Recurring Basis	The following table sets forth by level within the fair value hierarchy the fair value of the Company's available-for-sale securities measured on a recurring basis, excluding cash and money market funds:
		31-Dec-14
		Level 1		Level 2		Level 3			Fair Value
		(in thousands)
	Commercial paper	$	—	$	5,999	$	—		$	5,999
	U.S. government agencies	—		53,832		—			53,832
	Corporate bonds	—		15,537		—			15,537
	Asset-backed securities	—		16,094		—			16,094
	Total	$	—	$	91,462	$	—		$	91,462
		31-Dec-13
		Level 1		Level 2		Level 3			Fair Value
		(in thousands)
	Commercial paper	$	—	$	47,488	$	—		$	47,488
	U.S. government agencies	—		18,837		—			18,837
	Municipal bonds	—		1,128		—			1,128
	Corporate bonds	—		32,179		—			32,179
	Asset-backed securities	—		5,501		—			5,501
	Total	$	—	$	105,133	$	—		$	105,133
Schedule of Investments Classified by Contractual Maturity	The following summarizes the fair value of securities classified as available-for-sale by contractual maturity:
		31-Dec-14
		Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
	Commercial paper	$	5,999	$	—	$	—		$	5,999
	U.S. government agencies	33,577		20,255		—			53,832
	Corporate bonds	12,438		3,099		—			15,537
	Asset-backed securities	—		7,327		8,767			16,094
	Total	$	52,014	$	30,681	$	8,767		$	91,462
		31-Dec-13
		Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
	Commercial paper	$	47,488	$	—	$	—		$	47,488
	U.S. government agencies	4,004		14,833		—			18,837
	Municipal bonds	1,128		—		—			1,128
	Corporate bonds	16,905		15,274		—			32,179
	Asset-backed securities	—		—		5,501			5,501
	Total	$	69,525	$	30,107	$	5,501		$	105,133

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and equipment	Property and equipment, which includes assets under capital lease, consists of the following:
		December 31,
		2014			2013
		(in thousands)
	Computer equipment	$	35,576		$	27,464
	Computer software	10,899			9,277
	Furniture, fixtures and equipment	2,931			2,031
	Scanner appliances	19,861			17,055
	Leasehold improvements	2,622			2,100
	Total property and equipment	71,889			57,927
	Less: accumulated depreciation and amortization	(45,271		)	(34,852		)
	Property and equipment, net	$	26,618		$	23,075

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying value of intangible assets	The carrying values of intangible assets are as follows (in thousands):
						December 31,
						2014					2013
			Estimated Lives	Cost		Accumulated Amortization			Net Book Value		Accumulated Amortization			Net Book Value
	Existing technology		7 years	$	1,910	$	(1,183	)	$	727	$	(909	)	$	1,001
	Patent license		14 years	1,388		(422		)	966		(323		)	1,065
	Non-competition agreements and other		3 years	171		(158		)	13		(138		)	33
	Total intangibles subject to amortization			$	3,469	$	(1,763	)	1,706		$	(1,370	)	2,099
	Intangible assets not subject to amortization								295					295
	Total intangible assets, net								$	2,001				$	2,394
Intangible assets future periods amortization expense	As of December 31, 2014, the Company expects amortization expense in future periods to be as follows (in thousands):
	2015	$	386
	2016	373
	2017	282
	2018	100
	2019	100
	2020 and thereafter	465
	Total expected future amortization expense	$	1,706

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments for Operating Leases	The following are the minimum annual lease payments due under operating leases at December 31, 2014:
		Operating Leases
		(in thousands)
	2015	$	4,409
	2016	3,046
	2017	1,830
	2018	439
	2019	226
	Total minimum lease payments	$	9,950

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Attributable to Parent [Abstract]
Schedule of shares reserved for future issuance	The Company had reserved shares of common stock for future issuance as of December 31, 2014:
	Options outstanding under equity incentive plans
	2000 Equity Incentive Plan (1)	3,970,662
	2012 Equity Incentive Plan (1)	3,634,745
	Shares available for future grants under an equity incentive plan
	2012 Equity Incentive Plan (1)	803,630
	Total shares reserved for future issuance	8,409,037
	(1) See Note 8 for a description of these plans.

Employee_Stock_and_Benefit_Pla1

Employee Stock and Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Stock-based employee compensation	Stock-based employee compensation is included in the consolidated statements of operations as follows:
		Year Ended December 31,
		2014				2013			2012
		(in thousands)
	Cost of revenues	$	757			$	421		$	272
	Research and development	2,463				1,038			649
	Sales and marketing	2,394				1,244			993
	General and administrative	4,217				1,842			1,008
	Total stock-based employee compensation	$	9,831			$	4,545		$	2,922
Fair value assumptions of options granted to employees	The fair value of each option granted to employees is estimated on the date of grant using the Black-Scholes option-pricing model based on the following assumptions:
		Year Ended December 31,
		2014		2013		2012
	Expected term (in years)	5.3 to 5.9		5.4 to 6.1		5.3 to 6.1
	Volatility	48% to 52%		52% to 53%		52% to 53%
	Risk-free interest rate	1.5% to 1.7%		0.7% to 1.5%		0.6% to 0.9%
	Dividend yield	—		—		—
Stock option activity	A summary of the Company’s stock option activity is as follows:
		Outstanding			Weighted			Weighted		Aggregate
		Shares			Average			Average		Intrinsic
					Exercise			Remaining		Value
					Price			Contractual
								Life (Years)
										(in thousands)
	Balance as of December 31, 2011	6,312,041			$	3.36		6.9		$	16,012
	Granted	1,478,781			8.94
	Exercised	(724,316	)		2.86
	Canceled	(552,998	)		6.79
	Balance as of December 31, 2012	6,513,508			4.39			6.6		67,711
	Granted	2,001,400			15.78
	Exercised	(952,871	)		4.32
	Canceled	(522,944	)		10.71
	Balance as of December 31, 2013	7,039,093			7.17			6.5		112,312
	Granted	2,744,150			26.16
	Exercised	(1,216,710	)		6.28
	Canceled	(961,126	)		16.91
	Balance as of December 31, 2014	7,605,407			12.93			6.5		188,743
	Vested and expected to vest—December 31, 2014	6,931,052			11.87			6.2		179,352
	Exercisable—December 31, 2014	4,598,180			5.68			5		146,714
Schedule of exercise price range, outstanding and vested	The following table summarizes the outstanding and vested stock options at December 31, 2014:
		Outstanding								Vested
	Exercise Price	Number of			Weighted			Weighted		Number of		Weighted
		Shares			Average			Average		Shares		Average
					Exercise			Remaining				Exercise
					Price Per			Contractual				Price Per
					Share			Life (Years)				Share
	$1.00 - $1.50	238,559			$	1.4		1.5		238,559		$	1.4
	$1.90 - $1.90	941,482			1.9			2.1		941,482		1.9
	$2.10 - $2.80	461,758			2.62			3.9		461,758		2.62
	$3.80 - $3.80	1,148,568			3.8			4.8		1,126,625		3.8
	$4.10 - $8.40	924,121			5.55			6		826,292		5.35
	$8.90 - $12.68	846,930			11.2			7.9		392,645		10.93
	$13.50 - $20.80	962,889			18.5			8.5		250,599		17.03
	$22.31 - $23.51	383,050			23.28			9.6		45,009		22.55
	$26.86 - $26.86	701,350			26.86			9		29,728		26.86
	$30.58 - $30.58	996,700			30.58			9.4		66,927		30.58
		7,605,407			12.93			6.5		4,379,624		5.58

Other_Income_Expense_Net_Table

Other Income (Expense), Net (Tables)	12 Months Ended
	Dec. 31, 2014
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income (Expense)	Other income (expense), net consists of the following:
		Year Ended December 31,
		2014			2013			2012
		(in thousands)
	Foreign exchange losses	$	(664	)	$	(679	)	$	(238	)
	Other income (expense)	(413		)	79			(9		)
	Other income (expense), net	$	(1,077	)	$	(600	)	$	(247	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Geographical Breakdown of Income (Loss) Before Provision for (Benefit From) Income Taxes	The Company’s geographical breakdown of income before income taxes is as follows:
		Year Ended December 31,
		2014				2013				2012
		(in thousands)
	Domestic	$	7,384			$	947			$	1,656
	Foreign	1,229				1,094				923
	Income before income taxes	$	8,613			$	2,041			$	2,579
Schedule of Provision for (Benefit From) Income Taxes	The (benefit from) provision for income taxes consists of the following:
		Year Ended December 31,
		2014				2013				2012
		(in thousands)
	Current
	Federal	$	—			$	(40	)		$	(18	)
	State	317				154				202
	Foreign	651				452				147
	Total current provision	968				566				331
	Deferred
	Federal	$	(22,184	)		$	6			$	27
	State	(433		)		—				—
	Foreign	18				(72		)		—
	Total deferred provision (benefit)	(22,599		)		(66		)		27
	Total (benefit from) provision for income taxes	$	(21,631	)		$	500			$	358
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation of the statutory federal income tax rate to the Company’s effective tax rate is as follows:
		Year Ended December 31,
		2014			2013			2012
	Federal statutory rate	35	%		34	%		34	%
	State taxes	1.4			5.1			5.5
	Stock-based compensation	1.3			9.1			22.9
	Foreign source income	3.9			1.9			(3.5	)
	Change in valuation allowance	(270.5	)		(28.4	)		(47.9	)
	Incremental federal rate benefit previously not recognized	(7.0	)		—			—
	Federal and state research and development credit	(11.3	)		—			—
	Other	(3.9	)		2.8			2.9
	(Benefit from) provision for income taxes	(251.1	)%		24.5	%		13.9	%
Schedule of Deferred Tax Assets and Liabilities	The components of the Company’s deferred tax assets and liabilities are as follows:
		December 31,
		2014				2013
		(in thousands)
	Deferred tax assets
	Net operating loss carryforwards	$	12,849			$	18,895
	Research and development credit carryforwards	6,392				5,189
	Accrued liabilities	583				581
	Deferred revenues	3,291				3,188
	Deferred rent	191				210
	Intangible assets	401				440
	Stock-based compensation	4,149				1,714
	Other	903				521
	Gross deferred tax assets	28,759				30,738
	Valuation allowance	(3,079		)		(27,181		)
	Net deferred tax assets	25,680				3,557
	Deferred tax liabilities
	Fixed assets	(3,039		)		(3,483		)
	Intangible assets	(2		)		(34		)
	Total deferred tax liabilities	(3,041		)		(3,517		)
	Net deferred tax assets	$	22,639			$	40
	Current and non-current deferred tax assets and liabilities included in the consolidated balance sheets are recorded as follows:
		December 31,
		2014				2013
		(in thousands)
	Current deferred tax assets	$	8,520			$	114
	Current deferred tax liabilities	—				—
	Noncurrent deferred tax assets	14,119				72
	Noncurrent deferred tax liabilities	—				(146		)
	Net deferred tax assets	$	22,639			$	40
Schedule of Unrecognized Tax Benefits	A reconciliation of the Company’s unrecognized tax benefits is as follows:
		Year Ended December 31,
		2014				2013				2012
		(in thousands)
	Unrecognized tax benefits beginning balance	$	3,255			$	2,647			$	2,792
	Gross increase for tax positions of prior years	—				241				—
	Gross decrease for tax positions of prior years	(127		)		—				(46		)
	Gross increase for tax positions of current year	332				446				140
	Settlements	—				—				(106		)
	Lapse of statute of limitations	(130		)		(79		)		(133		)
	Total unrecognized tax benefits	$	3,330			$	3,255			$	2,647

Segment_Information_and_Inform1

Segment Information and Information about Geographic Area (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Revenues and property and equipment, net, by geographic area	Revenues by geographic area, based on the location of the customer, are as follows:
		Year Ended December 31,
		2014		2013		2012
		(in thousands)
	United States	$	93,425	$	75,485	$	62,616
	Other	40,154		32,477		28,804
	Total revenues	$	133,579	$	107,962	$	91,420
	Property and equipment, net, by geographic area, are as follows:
		December 31,
		2014		2013
		(in thousands)
	United States	$	23,650	$	19,909
	Other	2,968		3,166
	Total property and equipment, net	$	26,618	$	23,075

Net_Income_Per_Share_Attributa1

Net Income Per Share Attributable to Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The computations for basic and diluted net income per share attributable to common stockholders are as follows:
		Year Ended December 31,
		2014			2013			2012
		(in thousands, except per share data)
	Numerator:
	Net income	$	30,244		$	1,541		$	2,221
	Net income attributable to participating securities	—			(2		)	(1,172		)
	Net income attributable to common stockholders - basic	30,244			1,539			1,049
	Undistributed earnings reallocated to participating securities	—			—			1,201
	Net income attributable to common stockholders - diluted	$	30,244		$	1,539		$	2,250
	Denominator:
	Weighted-average shares used in computing net income per share attributable to common stockholders - basic	32,979			31,914			11,891
	Effect of potentially dilutive securities:
	Convertible preferred stock	—			—			13,270
	Common stock options	4,191			4,059			3,187
	Contingently issuable shares related to an acquisition	—			—			4
	Weighted-average shares used in computing net income per share attributable to common stockholders - diluted	37,170			35,973			28,352
	Net income per share attributable to common stockholders
	Basic	$	0.92		$	0.05		$	0.09
	Diluted	$	0.81		$	0.04		$	0.08
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Potentially dilutive securities not included in the calculation of diluted net income per share because doing so would be antidilutive are as follows:
		Year Ended December 31,
		2014		2013			2012
		(in thousands)
	Common stock options	1,689		952			772

Quarterly_Financial_Informatio1

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information
		Three Months Ended
		Mar. 31,			Jun. 30,		Sep. 30, 2013		Dec. 31, 2013			Mar. 31,			Jun. 30,		Sep. 30, 2014			Dec. 31, 2014
		2013			2013							2014			2014
		(unaudited)
		(in thousands, except per share data)
	Revenues	$	24,883		$	26,291	$	27,749	$	29,039		$	30,356		$	32,302	$	34,348		$	36,573
	Cost of revenues	5,795			5,924		6,415		6,526			6,846			7,175		7,421			7,521
	Gross profit	19,088			20,367		21,334		22,513			23,510			25,127		26,927			29,052
	Operating expenses:
	Research and development	5,297			5,291		5,151		5,939			6,404			6,411		6,490			7,015
	Sales and marketing	10,168			10,160		10,411		11,784			12,492			11,845		11,774			11,938
	General and administrative	3,896			4,053		4,277		4,566			4,875			5,081		5,156			5,888
	Total operating expenses	19,361			19,504		19,839		22,289			23,771			23,337		23,420			24,841
	Income (loss) from operations	(273		)	863		1,495		224			(261		)	1,790		3,507			4,211
	Other income (expense), net(2)	(270		)	51		12		(61		)	12			41		(119		)	(568		)
	Income (loss) before income taxes (2)	(543		)	914		1,507		163			(249		)	1,831		3,388			3,643
	Provision for (benefit from) income taxes(1)	70			92		210		128			182			174		283			(22,270		)
	Net income (loss) (2)	$	(613	)	$	822	$	1,297	$	35		$	(431	)	$	1,657	$	3,105		$	25,913
	Net income (loss) attributable to common stockholders	$	(613	)	$	821	$	1,295	$	35		$	(431	)	$	1,657	$	3,105		$	25,913
	Net income (loss) per share attributable to common stockholders:
	Basic (2)	$	(0.02	)	$	0.03	$	0.04	$	0		$	(0.01	)	$	0.05	$	0.09		$	0.77
	Diluted (2)	$	(0.02	)	$	0.02	$	0.04	$	0		$	(0.01	)	$	0.04	$	0.08		$	0.69
	(1) Provision for income taxes consists primarily of taxes on income in foreign jurisdictions and state income taxes in the U.S. In the fourth quarter of 2014, the Company recorded a tax benefit of $23.7 million to recognize its U.S. federal and certain state deferred tax assets.
	(2) Other income (expense), income (loss) before income taxes, net income (loss), net income (loss) attributable to common stockholders and net income (loss) per share have been adjusted for an immaterial error as further described in Note 1 to the consolidated financial statements.

The_Company_and_Summary_of_Sig3

The Company and Summary of Significant Accounting Policies (Details)

0 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

Oct. 03, 2012

Sep. 30, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Oct. 03, 2012

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Oct. 03, 2012

Oct. 03, 2012

Oct. 03, 2012

Oct. 03, 2012

USD ($)

USD ($)

USD ($)

USD ($)

Minimum

Maximum

Scanner appliances

Forward contracts

Forward contracts

Forward contracts

Forward contracts

Forward contracts

Forward contracts

Customer concentration risk

Customer concentration risk

Common Stock

Common Stock

Software and software development costs

Software and software development costs

Convertible Preferred Stock

IPO

IPO

IPO Overallotment

contract

contract

USD ($)

USD ($)

EUR (€)

GBP (£)

EUR (€)

GBP (£)

Accounts receivable

Accounts receivable

USD ($)

USD ($)

USD ($)

Common Stock

Convertible Preferred Stock

Common Stock

customer

customer

USD ($)

Initial Public Offering

Shares sold in IPO, including existing shares

8,711,250

Shares sold in initial public offering, including existing shares, price per share

$12

Issuance of common stock upon initial public offering, net of offering costs (in shares)

7,836,250

7,836,250

1,136,250

Shares sold by existing stockholders during initial public offering

875,000

Proceeds from issuance of initial public offering

$87,500,000

Sale of stock, expenses incurred in offering

2,900,000

Conversion of stock, shares converted

17,597,258

Concentration of Credit Risk

Concentration risk, number of customers

0

0

Property Equipment, Net

Property, plant and equipment, useful life

3 years

5 years

3 years

Goodwill and Intangible Assets

Finite-lived intangible asset, useful life

3 years

14 years

Software Development Costs

Capitalized software development costs

98,000

0

0

Capitalized development costs

3,469,000

400,000

300,000

Accumulated Amortization

1,763,000

1,370,000

300,000

Derivative Financial Instruments

Derivative, number of instruments held

2

2

Derivative, notional amount

6,000,000

2,100,000

6,300,000

2,000,000

Foreign currency contract, asset, fair value disclosure

0

0

Derivative instruments not designated as hedging instruments, gain

700,000

Foreign currency transaction loss, before tax

-1,400,000

Derivative instruments not designated as hedging instruments, loss

800,000

Foreign currency transaction gain, before tax

200,000

Advertising Expenses

Advertising expense

5,300,000

4,200,000

4,300,000

Reverse Stock Split

Stockholders' equity, reverse stock split

one-for-ten reverse stock split

Stockholders' equity note, stock split, conversion ratio

0.1

Foreign exchange losses

-664,000

-679,000

-238,000

Conversion of Stock, Amount Converted

$0

$0

$63,873,000

$63,900,000

The_Company_and_Summary_of_Sig4

The Company and Summary of Significant Accounting Policies (Revisions and Reclassifications) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other income (expense), net									($1,077)	($600)	($247)
Other income (expense), net	-568	-119	41	12	-61	12	51	-270	-634	-268	-425
Net income	25,913	3,105	1,657	-431	35	1,297	822	-613	30,244	1,541	2,221
Basic (in usd per share)	$0.77	$0.09	$0.05	($0.01)	$0	$0.04	$0.03	($0.02)	$0.92	$0.05	$0.09
Diluted (in usd per share)	$0.69	$0.08	$0.04	($0.01)	$0	$0.04	$0.02	($0.02)	$0.81	$0.04	$0.08
Change in foreign currency translation gain (loss), net of zero tax										0	0
Comprehensive income									30,216	1,571	2,229
Net cash provided by operating activities									41,423	25,081	21,924
Net cash used in investing activities									-14,333	-20,675	-94,796
Effect of exchange rate changes on cash and cash equivalents									-48	1	7
Net increase in cash and cash equivalents									34,135	7,484	10,337
Accumulated other comprehensive income	10				38				10	38	8	0
Accumulated deficit	-43,350				-73,594				-43,350	-73,594	-75,135	-77,356
Total stockholders’ equity	151,827				103,117				151,827	103,117	91,555	-64,424
Scenario, Previously Reported [Member]
Other income (expense), net										-517	-188
Other income (expense), net										-185	-366
Net income										1,624	2,280
Basic (in usd per share)										$0.05	$0.09
Diluted (in usd per share)										$0.05	$0.08
Change in foreign currency translation gain (loss), net of zero tax										-83	-59
Comprehensive income										1,571	2,229
Net cash provided by operating activities										25,146	21,952
Net cash used in investing activities										-20,688	-94,784
Effect of exchange rate changes on cash and cash equivalents										-51	-33
Net increase in cash and cash equivalents										7,484	10,337
Accumulated other comprehensive income					-1,088					-1,088	-1,035	-984
Accumulated deficit					-72,468					-72,468	-74,092	-76,372
Total stockholders’ equity					$103,117					$103,117	$91,555	($64,424)

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Cash and Cash Equivalents, Available-for-sale Securities, Restricted Cash Reconciliation) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	$166,656	$132,766
Unrealized Gains	37	45
Unrealized Losses	-27	-7
Fair value	166,666	132,804
Cash and Cash Equivalents
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	76,504	42,368
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair value	76,504	42,369
Short-term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	50,716	54,810
Unrealized Gains	10	17
Unrealized Losses	-12	0
Fair value	50,714	54,827
Long-Term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	39,436	35,588
Unrealized Gains	27	27
Unrealized Losses	-15	-7
Fair value	39,448	35,608
Cash | Cash and Cash Equivalents
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	36,024	27,488
Fair value	36,024	27,488
Money market funds | Cash and Cash Equivalents
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	39,180	183
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	39,180	183
U.S. government agencies | Cash and Cash Equivalents
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	300
Unrealized Gains	0
Unrealized Losses	0
Fair value	300
U.S. government agencies | Short-term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	33,280	4,004
Unrealized Gains	3	0
Unrealized Losses	-6	0
Fair value	33,277	4,004
U.S. government agencies | Long-Term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	3,101	15,256
Unrealized Gains	0	22
Unrealized Losses	-2	-4
Fair value	3,099	15,274
Commercial paper | Cash and Cash Equivalents
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	1,000	14,697
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair value	1,000	14,698
Commercial paper | Short-term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	4,998	32,784
Unrealized Gains	1	6
Unrealized Losses	0	0
Fair value	4,999	32,790
Corporate bonds | Short-term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	12,438	16,894
Unrealized Gains	6	11
Unrealized Losses	-6	0
Fair value	12,438	16,905
Corporate bonds | Long-Term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	20,243	14,835
Unrealized Gains	22	1
Unrealized Losses	-10	-3
Fair value	20,255	14,833
Municipal bonds | Short-term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total		1,128
Unrealized Gains		0
Unrealized Losses		0
Fair value		1,128
Asset-backed securities | Long-Term Investments
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Amortized cost, total	16,092	5,497
Unrealized Gains	5	4
Unrealized Losses	-3	0
Fair value	$16,094	$5,501

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Fair Value Hierarchy) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	$91,462	$105,133
Recurring Basis | Fair Value
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	91,462	105,133
Level 1 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Level 2 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	91,462	105,133
Level 3 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	5,999	47,488
Commercial paper | Recurring Basis | Fair Value
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	5,999	47,488
Commercial paper | Level 1 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Commercial paper | Level 2 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	5,999	47,488
Commercial paper | Level 3 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
U.S. government agencies
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	53,832	18,837
U.S. government agencies | Recurring Basis | Fair Value
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	53,832	18,837
U.S. government agencies | Level 1 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
U.S. government agencies | Level 2 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	53,832	18,837
U.S. government agencies | Level 3 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value		1,128
Municipal bonds | Recurring Basis | Fair Value
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value		1,128
Municipal bonds | Level 1 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value		0
Municipal bonds | Level 2 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value		1,128
Municipal bonds | Level 3 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value		0
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	15,537	32,179
Corporate bonds | Recurring Basis | Fair Value
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	15,537	32,179
Corporate bonds | Level 1 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Corporate bonds | Level 2 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	15,537	32,179
Corporate bonds | Level 3 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	16,094	5,501
Asset-backed securities | Recurring Basis | Fair Value
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	16,094	5,501
Asset-backed securities | Level 1 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	0	0
Asset-backed securities | Level 2 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	16,094	5,501
Asset-backed securities | Level 3 | Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities, fair value	$0	$0

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Contractual Maturity) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	$52,014	$69,525
After One Year through Two Years	30,681	30,107
Over Two Years	8,767	5,501
Fair Value	91,462	105,133
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	5,999	47,488
After One Year through Two Years	0	0
Over Two Years	0	0
Fair Value	5,999	47,488
U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	33,577	4,004
After One Year through Two Years	20,255	14,833
Over Two Years	0	0
Fair Value	53,832	18,837
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year		1,128
After One Year through Two Years		0
Over Two Years		0
Fair Value		1,128
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	12,438	16,905
After One Year through Two Years	3,099	15,274
Over Two Years	0	0
Fair Value	15,537	32,179
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	0	0
After One Year through Two Years	7,327	0
Over Two Years	8,767	5,501
Fair Value	$16,094	$5,501

Fair_Value_of_Financial_Instru5

Fair Value of Financial Instruments (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Foreign currency contract, asset, fair value disclosure	$0	$0

Property_and_Equipment_Net_Det

Property and Equipment, Net (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment	$71,889,000	$57,927,000
Depreciation, Depletion And Amortization, Excluding Intangible Asset Amortization	11,500,000	9,200,000	6,900,000
Less: accumulated depreciation and amortization	-45,271,000	-34,852,000
Property and equipment, net	26,618,000	23,075,000
Capital lease		3,100,000
Capital lease, accumulated depreciation		1,200,000
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	35,576,000	27,464,000
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment	10,899,000	9,277,000
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	2,931,000	2,031,000
Scanner appliances
Property, Plant and Equipment [Line Items]
Property and equipment	19,861,000	17,055,000
Scanner appliances and other computer equipment subject to subscription
Property, Plant and Equipment [Line Items]
Property and equipment, net	6,000,000	4,700,000
Scanner appliances and other computer equipment not placed in service
Property, Plant and Equipment [Line Items]
Property and equipment	1,400,000	600,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	2,622,000	2,100,000
Other fixed assets not placed in service
Property, Plant and Equipment [Line Items]
Property and equipment	$2,800,000	$1,600,000

Business_Combination_Details

Business Combination (Details) (Nemean Networks, LLC, USD $)	0 Months Ended	1 Months Ended
In Millions, except Share data, unless otherwise specified	Aug. 31, 2010	Sep. 30, 2012
Nemean Networks, LLC
Business Acquisition [Line Items]
Consideration for acquisition	$3.70
Non-contingent payment		$1
Non-contingent payment, number of shares		6,250

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets, Net (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	$3,469,000
Accumulated Amortization	-1,763,000	-1,370,000
Net Book Value	1,706,000	2,099,000
Intangible assets not subject to amortization	295,000	295,000
Total intangible assets, net	2,001,000	2,394,000
Amortization of intangible assets	400,000	400,000	400,000
Goodwill	317,000	317,000
Existing technology
Schedule of Goodwill and Intangible Assets [Line Items]
Estimated Lives	7 years
Cost	1,910,000
Accumulated Amortization	-1,183,000	-909,000
Net Book Value	727,000	1,001,000
Patent license
Schedule of Goodwill and Intangible Assets [Line Items]
Estimated Lives	14 years
Cost	1,388,000
Accumulated Amortization	-422,000	-323,000
Net Book Value	966,000	1,065,000
Non-competition agreements and other
Schedule of Goodwill and Intangible Assets [Line Items]
Estimated Lives	3 years
Cost	171,000
Accumulated Amortization	-158,000	-138,000
Net Book Value	$13,000	$33,000

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets, Net (Future Amortization) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$386
2016	373
2017	282
2018	100
2019	100
2020 and thereafter	465
Net Book Value	$1,706	$2,099

Commitments_and_Contingencies_1

Commitments and Contingencies (Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leased Assets [Line Items]
Rent expense	$6,200,000	$5,400,000	$4,300,000
Deferred rent credit, noncurrent	500,000	600,000
Capital Lease Obligations | Minimum
Leased Assets [Line Items]
Debt interest rate		1.80%
Capital Addition Purchase Commitments | Capital Lease Obligations
Leased Assets [Line Items]
Debt face amount				3,100,000
Maintenance and Support
Leased Assets [Line Items]
Recorded unconditional purchase obligation	$0	$300,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Leases Table) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Leases
2015	$4,409
2016	3,046
2017	1,830
2018	439
2019	226
Total minimum lease payments	$9,950

Commitments_and_Contingencies_3

Commitments and Contingencies (Sales and Other Taxes) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Sales and other taxes, current	$0.50	$0.50

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 03, 2012
Common Stock
Options outstanding under equity incentive plans	7,605,407	7,039,093	6,513,508	6,312,041
Total shares reserved for future issuance	8,409,037
Convertible Preferred Stock and Preferred Stock
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, par value per share (in dollars per share)	$0.00	$0.00
2000 Equity Incentive Plan
Common Stock
Options outstanding under equity incentive plans	3,970,662
2012 Equity Incentive Plan
Common Stock
Options outstanding under equity incentive plans	3,634,745
Shares available for future grants under an equity incentive plan	803,630
Preferred Stock
Convertible Preferred Stock and Preferred Stock
Preferred stock, shares authorized					20,000,000
Preferred stock, par value per share (in dollars per share)					$0.00

Employee_Stock_and_Benefit_Pla2

Employee Stock and Benefit Plans (Plan Information) (Details)	0 Months Ended	12 Months Ended
	Sep. 26, 2012	Dec. 31, 2014	Sep. 30, 2014
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized			4,668,764
Number of shares available for grant		803,630
2012 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
2012 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Term of award	10 years
2000 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Term of award		10 years
Number of shares available for issuance		0
2000 Equity Incentive Plan | Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award strike price as a percentage of market value		85.00%
Increase of Number of Shares Option | 2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan annual increase (in shares)	3,050,000
Increase of Percentage of Shares Outstanding Option | 2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan, annual increase, percent of shares outstanding	5.00%

Employee_Stock_and_Benefit_Pla3

Employee Stock and Benefit Plans (Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based employee compensation	$9,831,000	$4,545,000	$2,922,000
Unrecognized employee compensation cost	27,100,000
Unrecognized employee compensation cost, period for recognition	2 years
Non-employee share-based compensation expense	700,000	900,000	500,000
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based employee compensation	757,000	421,000	272,000
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based employee compensation	2,463,000	1,038,000	649,000
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based employee compensation	2,394,000	1,244,000	993,000
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based employee compensation	$4,217,000	$1,842,000	$1,008,000

Employee_Stock_and_Benefit_Pla4

Employee Stock and Benefit Plans (Fair Value Assumptions, Stock Options) (Details) (Stock Options)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	5 years 3 months 7 days	5 years 4 months 24 days	5 years 3 months 18 days
Volatility	48.00%	52.00%	52.00%
Risk-free interest rate	1.50%	0.70%	0.60%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	5 years 10 months 7 days	6 years 1 month 6 days	6 years 1 month 6 days
Volatility	52.00%	53.00%	53.00%
Risk-free interest rate	1.70%	1.50%	0.90%

Employee_Stock_and_Benefit_Pla5

Employee Stock and Benefit Plans (Stock Option Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Outstanding Shares
Beginning balance (in shares)	7,039,093	6,513,508	6,312,041
Granted (in shares)	2,744,150	2,001,400	1,478,781
Exercised (in shares)	-1,216,710	-952,871	-724,316
Canceled (in shares)	-961,126	-522,944	-552,998
Ending balance (in shares)	7,605,407	7,039,093	6,513,508	6,312,041
Vested and Expected to vest (in shares)	6,931,052
Exercisable (in shares)	4,598,180
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in dollars per share)	$7.17	$4.39	$3.36
Weighted average exercise price, granted (in dollars per share)	$26.16	$15.78	$8.94
Weighted average exercise price, exercised (in dollars per share)	$6.28	$4.32	$2.86
Weighted average exercise price, canceled (in dollars per share)	$16.91	$10.71	$6.79
Weighted average exercise price, ending balance (in dollars per share)	$12.93	$7.17	$4.39	$3.36
Vested and Expected to vest, weighted average exercise price (in dollars per share)	$11.87
Exercisable, Weighted average exercise price (in dollars per share)	$5.68
Weighted Average Remaining Contractual Life (Years)
Weighted average remaining contractual life	6 years 6 months 7 days	6 years 6 months	6 years 7 months 6 days	6 years 10 months 24 days
Vested and Expected to vest, weighted average remaining contractual life	6 years 2 months 7 days
Exercisable, weighted average remaining contractual life	5 years 0 months 7 days
Aggregate Intrinsic Value
Aggregate intrinsic value	$188,743	$112,312	$67,711	$16,012
Vested and Expected to vest, aggregate intrinsic value	179,352
Exercisable, aggregate intrinsic value	$146,714

Employee_Stock_and_Benefit_Pla6

Employee Stock and Benefit Plans (Options Outstanding and Vested) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, outstanding	7,605,407
Weighted average exercise price per share, outstanding (in dollar per share)	$12.93
Weighted average remaining contractual life, outstanding	6 years 6 months
Number of shares, vested	4,379,624
Weighted average exercise price per share, vested (in dollar per share)	$5.58
Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted average grant date fair value (in dollars per share)	$12.07	$7.62	$4.27
Grant date fair value	$33.10	$15.20	$6.30
Intrinsic value of options exercised	$25.70	$11.10	$4
$1.00 - $1.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$1
Exercise price range, upper limit (in dollar per share)	$1.50
Number of shares, outstanding	238,559
Weighted average exercise price per share, outstanding (in dollar per share)	$1.40
Weighted average remaining contractual life, outstanding	1 year 6 months 7 days
Number of shares, vested	238,559
Weighted average exercise price per share, vested (in dollar per share)	$1.40
$1.90 - $1.90
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$1.90
Exercise price range, upper limit (in dollar per share)	$1.90
Number of shares, outstanding	941,482
Weighted average exercise price per share, outstanding (in dollar per share)	$1.90
Weighted average remaining contractual life, outstanding	2 years 1 month 7 days
Number of shares, vested	941,482
Weighted average exercise price per share, vested (in dollar per share)	$1.90
$2.10 - $2.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$2.10
Exercise price range, upper limit (in dollar per share)	$2.80
Number of shares, outstanding	461,758
Weighted average exercise price per share, outstanding (in dollar per share)	$2.62
Weighted average remaining contractual life, outstanding	3 years 10 months 7 days
Number of shares, vested	461,758
Weighted average exercise price per share, vested (in dollar per share)	$2.62
$3.80 - $3.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$3.80
Exercise price range, upper limit (in dollar per share)	$3.80
Number of shares, outstanding	1,148,568
Weighted average exercise price per share, outstanding (in dollar per share)	$3.80
Weighted average remaining contractual life, outstanding	4 years 9 months 7 days
Number of shares, vested	1,126,625
Weighted average exercise price per share, vested (in dollar per share)	$3.80
$4.10 - $8.40
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$4.10
Exercise price range, upper limit (in dollar per share)	$8.40
Number of shares, outstanding	924,121
Weighted average exercise price per share, outstanding (in dollar per share)	$5.55
Weighted average remaining contractual life, outstanding	6 years 0 months 7 days
Number of shares, vested	826,292
Weighted average exercise price per share, vested (in dollar per share)	$5.35
$8.90 - $12.68
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$8.90
Exercise price range, upper limit (in dollar per share)	$12.68
Number of shares, outstanding	846,930
Weighted average exercise price per share, outstanding (in dollar per share)	$11.20
Weighted average remaining contractual life, outstanding	7 years 10 months 7 days
Number of shares, vested	392,645
Weighted average exercise price per share, vested (in dollar per share)	$10.93
$13.50 - $20.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$13.50
Exercise price range, upper limit (in dollar per share)	$20.80
Number of shares, outstanding	962,889
Weighted average exercise price per share, outstanding (in dollar per share)	$18.50
Weighted average remaining contractual life, outstanding	8 years 6 months 7 days
Number of shares, vested	250,599
Weighted average exercise price per share, vested (in dollar per share)	$17.03
$22.31 - $23.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$22.31
Exercise price range, upper limit (in dollar per share)	$23.51
Number of shares, outstanding	383,050
Weighted average exercise price per share, outstanding (in dollar per share)	$23.28
Weighted average remaining contractual life, outstanding	9 years 7 months 7 days
Number of shares, vested	45,009
Weighted average exercise price per share, vested (in dollar per share)	$22.55
$26.86 - $26.86
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$26.86
Exercise price range, upper limit (in dollar per share)	$26.86
Number of shares, outstanding	701,350
Weighted average exercise price per share, outstanding (in dollar per share)	$26.86
Weighted average remaining contractual life, outstanding	9 years 0 months 7 days
Number of shares, vested	29,728
Weighted average exercise price per share, vested (in dollar per share)	$26.86
$30.58 - $30.58
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollar per share)	$30.58
Exercise price range, upper limit (in dollar per share)	$30.58
Number of shares, outstanding	996,700
Weighted average exercise price per share, outstanding (in dollar per share)	$30.58
Weighted average remaining contractual life, outstanding	9 years 4 months 7 days
Number of shares, vested	66,927
Weighted average exercise price per share, vested (in dollar per share)	$30.58

Employee_Stock_and_Benefit_Pla7

Employee Stock and Benefit Plans (Restricted Stock) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based employee compensation	$9,831	$4,545	$2,922
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	2,401	2,900	3,750
Stock-based employee compensation	$51	$41	$37

Other_Income_Expense_Net_Detai

Other Income (Expense), Net (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income and Expenses [Abstract]
Foreign exchange losses	($664)	($679)	($238)
Other income (expense)	-413	79	-9
Other income (expense), net	($1,077)	($600)	($247)

Income_Taxes_Income_Before_Pro

Income Taxes (Income Before Provision for (Benefit From) Income Taxes) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (Loss) from Continuing Operations
Domestic									$7,384	$947	$1,656
Foreign									1,229	1,094	923
Income before income taxes	$3,643	$3,388	$1,831	($249)	$163	$1,507	$914	($543)	$8,613	$2,041	$2,579

Income_Taxes_Provision_For_Ben

Income Taxes (Provision For (Benefit From) Income Taxes) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal									$0	($40)	($18)
State									317	154	202
Foreign									651	452	147
Total current provision									968	566	331
Deferred
Federal									-22,184	6	27
State									-433	0	0
Foreign									18	-72	0
Total deferred provision (benefit)									-22,599	-66	27
Provision for (benefit from) income taxes	($22,270)	$283	$174	$182	$128	$210	$92	$70	($21,631)	$500	$358

Income_Taxes_Tax_Rate_Reconcil

Income Taxes (Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory rate	35.00%	34.00%	34.00%
State taxes	1.40%	5.10%	5.50%
Stock-based compensation	1.30%	9.10%	22.90%
Foreign source income	3.90%	1.90%	-3.50%
Change in valuation allowance	-270.50%	-28.40%	-47.90%
Incremental federal rate benefit previously not recognized	-7.00%	0.00%	0.00%
Federal and state research and development credit	-11.30%	0.00%	0.00%
Other	-3.90%	2.80%	2.90%
Provision for income taxes	-251.10%	24.50%	13.90%

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets
Net operating loss carryforwards	$12,849	$18,895
Research and development credit carryforwards	6,392	5,189
Accrued liabilities	583	581
Deferred revenues	3,291	3,188
Deferred rent	191	210
Intangible assets	401	440
Stock-based compensation	4,149	1,714
Other	903	521
Gross deferred tax assets	28,759	30,738
Valuation allowance	-3,079	-27,181
Net deferred tax assets	25,680	3,557
Deferred tax liabilities
Fixed assets	-3,039	-3,483
Intangible assets	-2	-34
Total deferred tax liabilities	-3,041	-3,517
Net deferred tax assets	$22,639	$40

Income_Taxes_Current_and_NonCu

Income Taxes (Current and Non-Current Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Current deferred tax assets	$8,520	$114
Current deferred tax liabilities	0	0
Noncurrent deferred tax assets	14,119	72
Noncurrent deferred tax liabilities	0	-146
Net deferred tax assets	$22,639	$40

Income_Taxes_Unrecognized_Tax_

Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits beginning balance	$3,255	$2,647	$2,792
Gross increase for tax positions of prior years	0	241	0
Gross decrease for tax positions of prior years	-127	0	-46
Gross increase for tax positions of current year	332	446	140
Settlements	0	0	-106
Lapse of statute of limitations	-130	-79	-133
Total unrecognized tax benefits	$3,330	$3,255	$2,647

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax [Line Items]
Valuation allowance increase (decrease)										$900,000
Valuation allowance	3,079,000				27,181,000				3,079,000	27,181,000
Provision for (benefit from) income taxes	-22,270,000	283,000	174,000	182,000	128,000	210,000	92,000	70,000	-21,631,000	500,000	358,000
Undistributed earnings of foreign subsidiaries	6,800,000				8,500,000				6,800,000	8,500,000
Unrecognized tax benefits that would impact effective tax rate	2,100,000				1,000,000				2,100,000	1,000,000	1,000,000
Internal Revenue Service (IRS) [Member]
Income Tax [Line Items]
Operating loss carryforwards	56,700,000								56,700,000
Deferred tax asset not recognized, net operating loss carryforwards	21,400,000								21,400,000
Internal Revenue Service (IRS) [Member] | Research and Development Credits [Member]
Income Tax [Line Items]
Tax credit carryforward	5,000,000								5,000,000
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Valuation allowance	3,079,000								3,079,000
Operating loss carryforwards	10,500,000								10,500,000
Deferred tax asset not recognized, net operating loss carryforwards	1,700,000								1,700,000
State and Local Jurisdiction [Member] | Research and Development Credits [Member]
Income Tax [Line Items]
Tax credit carryforward	5,200,000								5,200,000
Federal and State Jurisdictions [Member]
Income Tax [Line Items]
Provision for (benefit from) income taxes	($23,700,000)

Segment_Information_and_Inform2

Segment Information and Information about Geographic Area (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									segment
Segment Reporting Information [Line Items]
Number of operating segments									1
Revenues	$36,573	$34,348	$32,302	$30,356	$29,039	$27,749	$26,291	$24,883	$133,579	$107,962	$91,420
Property and equipment, net	26,618				23,075				26,618	23,075
United States
Segment Reporting Information [Line Items]
Revenues									93,425	75,485	62,616
Property and equipment, net	23,650				19,909				23,650	19,909
Other
Segment Reporting Information [Line Items]
Revenues									40,154	32,477	28,804
Property and equipment, net	$2,968				$3,166				$2,968	$3,166

Net_Income_Per_Share_Attributa2

Net Income Per Share Attributable to Common Stockholders (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$25,913	$3,105	$1,657	($431)	$35	$1,297	$822	($613)	$30,244	$1,541	$2,221
Net income attributable to participating securities									0	-2	-1,172
Net income attributable to common stockholders - basic	25,913	3,105	1,657	-431	35	1,295	821	-613	30,244	1,539	1,049
Undistributed earnings reallocated to participating securities									0	0	1,201
Net income attributable to common stockholders - diluted									$30,244	$1,539	$2,250
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders - basic									32,979	31,914	11,891
Effect of potentially dilutive securities:
Convertible preferred stock (in shares)									0	0	13,270
Common stock options (in shares)									4,191	4,059	3,187
Contingently issuable shares related to an acquisition (in shares)									0	0	4
Weighted - average shares used in computing net income (loss) per share attributable to common stockholders - diluted (in shares)									37,170	35,973	28,352
Basic (usd per share)	$0.77	$0.09	$0.05	($0.01)	$0	$0.04	$0.03	($0.02)	$0.92	$0.05	$0.09
Diluted (usd per share)	$0.69	$0.08	$0.04	($0.01)	$0	$0.04	$0.02	($0.02)	$0.81	$0.04	$0.08
Stock Options
Antidilutive Securities
Common stock options (in shares)									1,689	952	772

Quarterly_Financial_Informatio2

Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues [Abstract]
Revenues	$36,573	$34,348	$32,302	$30,356	$29,039	$27,749	$26,291	$24,883	$133,579	$107,962	$91,420
Cost of revenues	7,521	7,421	7,175	6,846	6,526	6,415	5,924	5,795	28,963	24,660	18,404
Gross profit	29,052	26,927	25,127	23,510	22,513	21,334	20,367	19,088	104,616	83,302	73,016
Operating expenses:
Research and development	7,015	6,490	6,411	6,404	5,939	5,151	5,291	5,297	26,320	21,678	20,195
Sales and marketing	11,938	11,774	11,845	12,492	11,784	10,411	10,160	10,168	48,049	42,523	37,738
General and administrative	5,888	5,156	5,081	4,875	4,566	4,277	4,053	3,896	21,000	16,792	12,079
Total operating expenses	24,841	23,420	23,337	23,771	22,289	19,839	19,504	19,361	95,369	80,993	70,012
Income from operations	4,211	3,507	1,790	-261	224	1,495	863	-273	9,247	2,309	3,004
Other income (expense), net	-568	-119	41	12	-61	12	51	-270	-634	-268	-425
Income before income taxes	3,643	3,388	1,831	-249	163	1,507	914	-543	8,613	2,041	2,579
Provision for (benefit from) income taxes	-22,270	283	174	182	128	210	92	70	-21,631	500	358
Net income	25,913	3,105	1,657	-431	35	1,297	822	-613	30,244	1,541	2,221
Net income (loss) attributable to common stockholders	25,913	3,105	1,657	-431	35	1,295	821	-613	30,244	1,539	1,049
Earnings Per Share [Abstract]
Basic (in usd per share)	$0.77	$0.09	$0.05	($0.01)	$0	$0.04	$0.03	($0.02)	$0.92	$0.05	$0.09
Diluted (in usd per share)	$0.69	$0.08	$0.04	($0.01)	$0	$0.04	$0.02	($0.02)	$0.81	$0.04	$0.08
Federal and State Jurisdictions [Member]
Operating expenses:
Provision for (benefit from) income taxes	($23,700)

Schedule_II_Schedule_of_Valuat1

Schedule II Schedule of Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$389		$331		$230
Charged to Costs and Expenses	470		307		218
Deductions and Other	-269	[1]	-249	[1]	-117	[1]
Balance at End of Year	$590		$389		$331
[1]	Primarily represents write-offs of uncollectible accounts, net of recoveries.