Qualys (QLYS) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'QUALYS, INC.	'
Entity Central Index Key	'0001107843	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	32,251,783

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$42,118	$34,885
Short-term investments	58,748	83,547
Accounts receivable, net of allowance of $381 and $331 at September 30, 2013 and December 31, 2012, respectively	25,022	24,545
Prepaid expenses and other current assets	5,116	4,377
Total current assets	131,004	147,354
Restricted cash	0	114
Long-term investments	24,805	0
Property and equipment, net	22,493	18,148
Intangible assets, net	2,492	2,811
Goodwill	317	317
Other noncurrent assets	564	1,574
Total assets	181,675	170,318
Current liabilities:	'	'
Accounts payable	1,097	2,031
Accrued liabilities	7,950	7,803
Deferred revenues, current	61,389	56,497
Capital lease obligations, current	1,071	1,183
Total current liabilities	71,507	67,514
Deferred revenues, noncurrent	8,456	8,616
Income taxes payable, noncurrent	684	594
Other noncurrent liabilities	533	1,231
Capital lease obligations, noncurrent	0	808
Total liabilities	81,180	78,763
Commitments and contingencies (Note 5)	'	'
Stockholders’ equity:	'	'
Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at September 30, 2013 and December 31, 2012	0	0
Common stock, $0.001 par value; 1,000,000,000 shares authorized, 32,237,969 and 31,420,028 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	32	31
Additional paid-in capital	174,056	166,651
Accumulated other comprehensive loss	-1,080	-1,035
Accumulated deficit	-72,513	-74,092
Total stockholders’ equity	100,495	91,555
Total liabilities and stockholders’ equity	$181,675	$170,318

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Allowance for Doubtful Accounts Receivable	$381	$331
Preferred Stock, Par or Stated Value Per Share (USD 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 (USD per share)	$0.00	$0.00
Common Stock, Shares Authorized	1,000,000,000	1,000,000,000
Common Stock, Shares Issued	32,237,969	31,420,028
Common Stock, Shares Outstanding	32,237,969	31,420,028

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues [Abstract]	'	'	'	'
Revenues	$27,749	$23,382	$78,923	$66,763
Cost of revenues	6,415	4,634	18,134	13,423
Gross profit	21,334	18,748	60,789	53,340
Operating expenses:	'	'	'	'
Research and development	5,151	5,076	15,739	15,325
Sales and marketing	10,411	8,797	30,739	27,827
General and administrative	4,277	3,154	12,226	8,811
Total operating expenses	19,839	17,027	58,704	51,963
Income from operations	1,495	1,721	2,085	1,377
Other income (expense), net:	'	'	'	'
Interest expense	-7	-38	-37	-153
Interest income	115	1	273	2
Other income (expense), net	-84	60	-370	-44
Total other income (expense), net	24	23	-134	-195
Income before provision for income taxes	1,519	1,744	1,951	1,182
Provision for income taxes	210	77	372	77
Net income	1,309	1,667	1,579	1,105
Net income attributable to common stockholders	$1,307	$415	$1,577	$264
Net income per share attributable to common stockholders:	'	'	'	'
Basic (USD per share)	$0.04	$0.07	$0.05	$0.05
Diluted (USD per share)	$0.04	$0.06	$0.04	$0.04
Weighted average shares used in computing net income per share attributable to common stockholders:	'	'	'	'
Basic (shares)	32,088	5,843	31,789	5,540
Diluted (shares)	36,247	26,545	35,704	25,972

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$1,309	$1,667	$1,579	$1,105
Change in foreign currency translation gain (loss), net of zero tax	-12	41	-73	-17
Available-for-sale investments:	'	'	'	'
Change in net unrealized gain on investments, net of zero tax	52	0	37	0
Less: reclassification adjustment for net gain included in net income	-1	0	-9	0
Net change, net of zero tax	51	0	28	0
Other comprehensive income (loss), net	39	41	-45	-17
Comprehensive income	$1,348	$1,708	$1,534	$1,088

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Change in foreign currency translation gain (loss), tax	$0	$0	$0	$0
Change in net unrealized gain (loss) on investments, tax	0	0	0	0
Net change, tax	$0	$0	$0	$0

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income	$1,579	$1,105
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization expense	7,050	5,397
Bad debt expense	211	182
Loss on disposal of property and equipment	12	3
Stock-based compensation	3,808	2,583
Non-cash interest expense	0	24
Amortization of premiums on investments	188	0
Changes in operating assets and liabilities:	'	'
Accounts receivable	-688	-2,884
Prepaid expenses and other assets	229	147
Accounts payable	-939	-542
Accrued liabilities	-608	-1,529
Deferred revenues	4,732	6,415
Other noncurrent liabilities	-383	-232
Net cash provided by operating activities	15,191	10,669
Cash flows from investing activities:	'	'
Purchases of investments	-113,689	0
Sales and maturities of investments	113,524	0
Purchases of property and equipment	-10,364	-8,104
Release of restricted cash	114	0
Net cash used in investing activities	-10,415	-8,104
Cash flows from financing activities:	'	'
Proceeds from exercise of stock options	3,374	1,998
Income tax benefits from exercise of stock options	59	0
Principal payments under capital lease obligations	-920	-1,763
Payment of consideration related to acquisition	0	-1,000
Payment for offering costs in connection with initial public offering	0	-560
Net cash provided by (used in) financing activities	2,513	-1,325
Effect of exchange rate changes on cash and cash equivalents	-56	16
Net increase in cash and cash equivalents	7,233	1,256
Cash and cash equivalents at beginning of period	34,885	24,548
Cash and cash equivalents at end of period	42,118	25,804
Non-cash investing and financing activities:	'	'
Purchases of property and equipment included in accrued liabilities	731	0
Vesting of early exercised common stock options	204	86
Deferred offerings costs not yet paid	0	1,973
Issuance of common stock for acquisition of license	$0	$51

The_Company_and_Summary_of_Sig

The Company and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
The Company and Summary of Significant Accounting Policies	'
	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.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared by the Company in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information as well as the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations.  The condensed consolidated balance sheet as of December 31, 2012, included herein, was derived from the audited financial statements as of that date but does not include all disclosures, including notes required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the financial position, results of operations and cash flows for the interim periods. The results of operations for the three and nine month periods ended September 30, 2013 is not necessarily indicative of the results of operations expected for the entire year ending December 31, 2013 or for any other future annual or interim period. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 filed with the SEC on March 5, 2013.
	Certain prior year amounts have been reclassified to conform to the current year presentation. These reclassifications did not change previously reported total assets, liabilities, stockholders' equity, income from operations or net income.
	Principles of Consolidation
	The accompanying condensed 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.
	Use of Estimates
	The preparation of the condensed 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 condensed 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 condensed consolidated financial statements.
	Concentration of Credit Risk
	The Company invests its cash, cash equivalents and investments with major financial institutions. Cash balances with any one institution at times may be in excess of federally insured limits. Cash equivalents and investments are invested in high-quality investment grade financial instruments and are diversified. The Company has not experienced any other-than-temporary 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 September 30, 2013 and December 31, 2012, 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 corporate bonds, 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 is stated at cost, which approximates fair market value. Cash equivalents and 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 condensed 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.
	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 February 2013, the FASB issued an update to ASC 220: Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. Under this update, an entity is required to provide information about the amounts reclassified out of accumulated other comprehensive income (”AOCI”) by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required to be reclassified in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. The Company adopted this standard in the first quarter of 2013, and the adoption of this standard did not have a material impact on the condensed consolidated financial statements. Amounts reclassified out of AOCI are recorded in interest income on the condensed consolidated statements of operations.
	In July 2013, the FASB issued ASU 2013-11: Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This update 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 will adopt this amendment as of January 2014. The result of adoption may be to offset certain long-term liabilities to long-term deferred tax assets and the adoption will not result in a change to the tax provision. The Company does not believe that the impact on the balance sheet will be significant.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	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 cash and certain cash equivalents, accounts receivable, restricted cash, 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 forward currency 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 forward currency 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.
	The Company's cash and cash equivalents, short-term investments, long-term investments and restricted cash consist of the following:
		30-Sep-13
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
		(in thousands)
	Cash and cash equivalents:
	Cash	$	25,434	$	—	$	—		$	25,434
	Money market funds	5,086		—		—			5,086
	Commercial paper	11,597		1		—			11,598
	Total	42,117		1		—			42,118
	Short-term investments:
	Commercial paper	43,960		14		(1		)	43,973
	Corporate bonds	9,640		7		—			9,647
	Municipal bonds	1,127		—		(1		)	1,126
	U.S. government agencies	4,001		1		—			4,002
	Total	58,728		22		(2		)	58,748
	Long-term investments:
	Asset-backed securities	3,996		3		(1		)	3,998
	U.S. government agencies	4,711		2		—			4,713
	Corporate bonds	16,083		13		(2		)	16,094
	Total	24,790		18		(3		)	24,805
	Total	$	125,635	$	41	$	(5	)	$	125,671
		31-Dec-12
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
		(in thousands)
	Cash and cash equivalents:
	Cash	$	23,419	$	—	$	—		$	23,419
	Money market funds	170		—		—			170
	Commercial paper	11,294		2		—			11,296
	Total	34,883		2		—			34,885
	Short-term investments:
	Commercial paper	21,078		2		—			21,080
	U.S. government agencies	62,463		4		—			62,467
	Total	83,541		6		—			83,547
	Restricted cash - cash	114		—		—			114
	Total	$	118,538	$	8	$	—		$	118,546
	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:
		30-Sep-13
		Level 1		Level 2		Level 3			Fair Value
		(in thousands)
	Commercial paper	$	—	$	55,571	$	—		$	55,571
	U.S. government agencies	—		8,715		—			8,715
	Municipal bonds	—		1,126		—			1,126
	Corporate bonds	—		25,741		—			25,741
	Asset-backed securities	—		3,998		—			3,998
	Total	$	—	$	95,151	$	—		$	95,151
		31-Dec-12
		Level 1		Level 2		Level 3			Fair Value
		(in thousands)
	Commercial paper	$	—	$	32,376	$	—		$	32,376
	U.S. government agencies	—		62,467		—			62,467
	Total	$	—	$	94,843	$	—		$	94,843
	The following summarizes the fair value of securities classified as available-for-sale by contractual maturity:
		30-Sep-13
		Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
	Commercial paper	$	55,571	$	—	$	—		$	55,571
U.S. government agencies	4,002		4,713		—			8,715
Municipal bonds	1,126		—		—			1,126
Corporate bonds	9,647		16,094		—			25,741
Asset-backed securities	—		—		3,998			3,998
Total	$	70,346	$	20,807	$	3,998		$	95,151
	31-Dec-12
	Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
	(in thousands)
Commercial paper	$	32,376	$	—	$	—		$	32,376
U.S. government agencies	62,467		—		—			62,467
Total	$	94,843	$	—	$	—		$	94,843
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 condensed 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 condensed 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. The Company does not enter into derivative financial instruments for trading or speculative purposes.
At September 30, 2013, the Company had two outstanding forward contracts with notional amounts of 4.2 million Euros and 1.9 million British pounds, both of which expired on October 31, 2013. At December 31, 2012, the Company had one outstanding forward contract with a notional amount of 10.7 million Euros, which expired on January 31, 2013. These forward contracts were entered into at the end of each month, and thus the fair value of these contracts was $0 at September 30, 2013 and December 31, 2012. The Company recorded losses of $0.4 million and $0.6 million from these contracts for the three and nine months ended September 30, 2013, respectively. These were partially offset by foreign currency transaction gains of $0.3 million and $0.1 million for the three and nine months ended September 30, 2013, respectively. The Company recorded losses of $0.4 million and $0.1 million from these contracts for the three and nine months ended September 30, 2012, respectively. These were offset by foreign currency transaction gains of $0.4 million and $49,000 for the three and nine months ended September 30, 2012, respectively. These derivatives did not meet the criteria to be designated as hedges. These instruments were valued using Level 2 inputs.
There were no significant 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	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property and Equipment, Net	'
	Property and Equipment, Net
	Property and equipment, which includes assets under capital lease, consists of the following:
		September 30,			December 31,
		2013			2012
		(in thousands)
	Computer equipment	$	25,613		$	18,798
	Computer software	9,139			6,327
	Furniture, fixtures and equipment	1,758			1,545
	Scanner appliances	16,646			16,470
	Leasehold improvements	1,876			1,672
	Total property and equipment	55,032			44,812
	Less: accumulated depreciation and amortization	(32,539		)	(26,664		)
	Property and equipment, net	$	22,493		$	18,148
	Assets held under capital lease included in computer software at September 30, 2013 and December 31, 2012 totaled approximately $3.8 million. The related accumulated depreciation at September 30, 2013 and December 31, 2012 totaled $1.7 million and $1.2 million, respectively. The capital lease obligations are secured by the related software.
	Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers have a net carrying value of $4.9 million and $5.5 million at September 30, 2013 and December 31, 2012, respectively, including assets that have not been placed in service of $1.0 million and $1.5 million, respectively. Other fixed assets not placed in service, included in computer equipment and leasehold improvements, relate to new information technology systems and tenant improvements and totaled approximately $1.7 million at September 30, 2013 and December 31, 2012. Depreciation and amortization expense relating to property and equipment, including capitalized leases, was $2.4 million and $1.7 million for three months ended September 30, 2013 and 2012, respectively and $6.7 million and $5.1 million for the nine months ended September 30, 2013 and 2012, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets, Net	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets, Net	'
	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):
						September 30, 2013					31-Dec-12
		Estimated Lives		Cost		Accumulated Amortization			Net Book Value		Accumulated Amortization			Net Book Value
	Existing technology	7 years		$	1,910	(842		)	$	1,068	$	(637	)	$	1,273
	Patent license	14 years		1,388		(297		)	1,091		(223		)	1,165
	Non-competition agreements and other	3 years		171		(133		)	38		(93		)	78
	Total intangibles subject to amortization			$	3,469	$	(1,272	)	2,197		$	(953	)	2,516
	Intangible assets not subject to amortization								295					295
	Total intangible assets, net								$	2,492				$	2,811
	Intangibles amortization expense was $0.1 million for the three months ended September 30, 2013 and 2012, and $0.3 million for the nine months ended September 30, 2013 and 2012.
	As of September 30, 2013, the Company expects amortization expense in future periods to be as follows (in thousands):
	Remainder of 2013	$	98
	2014	392
	2015	385
	2016	372
	2017	281
	2018 and thereafter	669
	Total expected future amortization expense	$	2,197
	Goodwill, which is not subject to amortization, totaled $0.3 million as of September 30, 2013 and December 31, 2012.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	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. The Company has also entered into capital lease obligations, with varying interest rates from 1.8% to 4.0%, a portion of which are secured by the related computer software as of September 30, 2013 and December 31, 2012.
	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. In connection with this transaction, the Company also has minimum obligations for related maintenance and support, which was amended in June 2013. The minimum obligations were $0.4 million and $1.6 million at September 30, 2013 and December 31, 2012, respectively. Such obligations for maintenance and support are recorded in current liabilities in the condensed consolidated balance sheets at September 30, 2013 and current and noncurrent liabilities at December 31, 2012.
	The following are the minimum annual lease payments due under these leases at September 30, 2013:
		Operating Leases		Capital Leases
		(in thousands)
	Remainder of 2013	$	1,026	$	268
	2014	3,693		815
	2015	2,676		—
	2016	1,850		—
	2017	1,623		—
	2018 and thereafter	295		—
	Total minimum lease payments	$	11,163	1,083
	Less amount representing interest			(12		)
	Present value of minimum payments			1,071
	Less current portion			(1,071		)
	Capital lease obligations, noncurrent			$	—
	Rent expense was $1.3 million and $1.1 million for the three months ended September 30, 2013 and 2012, respectively, and $4.0 million and $3.1 million for the nine months ended September 30, 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 September 30, 2013 and December 31, 2012, the Company has accrued $0.5 million of deferred rent related to these agreements, which is reflected in other noncurrent liabilities in the accompanying condensed 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 amounts 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 $0.4 million at September 30, 2013 and December 31, 2012, which is recorded within accrued liabilities in the condensed 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 condensed 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 September 30, 2013 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 September 30, 2013, other than an accrual for sales and other taxes, the Company has not recorded any material liabilities in accordance with accounting for contingencies.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	Stock-based Compensation
	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 3,050,000 shares of common stock. The number of shares of common stock available for issuance under the 2012 Plan includes an annual increase on January 1 of each year starting on January 1, 2014 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 September 30, 2013, 1,613,525 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 initial public offering ("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. As of September 30, 2013 and December 31, 2012, there were 20,336 and 47,220 shares, respectively, that were subject to the Company’s right to repurchase. The Company repurchased 125 unvested common shares in the three and nine months ended September 30, 2013. There were no shares repurchased during the three months ended September 30, 2012. For the nine months ended September 30, 2012, the Company repurchased 60,125 unvested common shares. The amounts paid for these shares purchased under an early exercise of stock options are not reported as a component of stockholders’ equity until those shares vest. The amounts received in exchange for these shares totaled $0.1 million and $0.3 million as of September 30, 2013 and December 31, 2012, respectively, have been recorded as an accrued liability in the accompanying condensed consolidated balance sheets and will be reclassified to common stock and additional paid-in capital as the shares vest.
	Employee Stock-based Compensation
	Employee stock-based compensation is included in the condensed consolidated statements of operations as follows:
		Three Months Ended								Nine months ended
		September 30,								September 30,
		2013				2012				2013			2012
		(in thousands)
	Cost of revenues	$	103			$	68			$	297		$	191
	Research and development	253				167				687			461
	Sales and marketing	363				306				804			746
	General and administrative	507				244				1,299			723
	Total stock-based employee compensation	$	1,226			$	785			$	3,087		$	2,121
	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 September 30, 2013 and December 31, 2012, the Company had $8.7 million and $5.8 million, respectively, 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:
		Three Months Ended				Nine months ended
		September 30,				September 30,
		2013		2012		2013		2012
	Expected term (in years)	5.4 to 6.1		5.3 to 6.0		5.4 to 6.1		5.3 to 6.0
	Volatility	52% to 53%		53%		52% to 53%		53%
	Risk-free interest rate	1.4% to 1.5%		0.6% to 0.7%		0.7% to 1.5%		0.6% to 0.8%
	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. Non-employee stock-based compensation was $0.4 million and $0.2 million for the three months ended September 30, 2013 and 2012, respectively, and $0.7 million and $0.4 million for the nine months ended September 30, 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 Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
											(in thousands)
	Balance as of December 31, 2012	6,513,508			$	4.39			6.6		$	67,711
	Granted	1,412,325			13.34
	Exercised	(816,166	)		4.13
	Canceled	(339,713	)		9.07
	Balance as of September 30, 2013	6,769,954			6.06				6.5		103,805
	Vested and expected to vest - September 30, 2013	6,109,405			5.53				6.3		96,911
	Exercisable - September 30, 2013	5,406,675			4.19				5.7		82,897
	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 the nine months ended September 30, 2013 and 2012, the Company granted 1,900 and 2,750 shares of restricted stock, respectively, which vested immediately and had no further restrictions or service period, and resulted in compensation expense of $20,000 and $32,000 for the nine months ended September 30, 2013 and 2012, respectively.

Other_Income_Expense_Net

Other Income (Expense), Net	9 Months Ended
	Sep. 30, 2013
Other Income and Expenses [Abstract]	'
Other Income (Expense), Net	'
	Other Income (Expense), Net
	Other income (expense), net consists of the following:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013			2012
		(in thousands)
	Foreign exchange gains (losses), net	$	(60	)	$	52	$	(474	)	$	(42	)
	Other income (expense)	(24		)	8		104			(2		)
	Other income (expense), net	$	(84	)	$	60	$	(370	)	$	(44	)

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The provision for income taxes for the nine months ended September 30, 2013 and 2012 primarily reflects the provision for income taxes for foreign and state taxes and certain discrete items.
	As of September 30, 2013, the Company had unrecognized tax benefits of $3.1 million, of which $0.9 million, if recognized and in absence of a valuation allowance, would favorably impact the Company's effective tax rate. As of December 31, 2012, the Company had unrecognized tax benefits of $2.6 million, of which $1.0 million, if recognized and in absence of valuation allowance, would favorably impact the Company's effective tax rate.

Segment_Information_and_Inform

Segment Information and Information about Geographic Area	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Information and Information about Geographic Area	'
	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:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(in thousands)
	United States	$	19,943	$	16,063	$	55,750	$	45,644
	Other	7,806		7,319		23,173		21,119
	Total revenues	$	27,749	$	23,382	$	78,923	$	66,763
	As of September 30, 2013 and December 31, 2012, property and equipment located outside the United States were not material.

Net_Income_Loss_Per_Share_Attr

Net Income (Loss) Per Share Attributable to Common Stockholders	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Net Income Per Share Attributable to Common Stockholders	'
	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:
		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2013				2012			2013			2012
		(in thousands)
	Numerator:
	Net income	$	1,309			$	1,667		$	1,579		$	1,105
	Net income attributable to participating securities	(2		)		(1,252		)	(2		)	(841		)
	Net income attributable to common stockholders - basic	1,307				415			1,577			264
	Undistributed earnings reallocated to participating securities	1				1,249			—			839
	Net income attributable to common stockholders - diluted	$	1,308			$	1,664		$	1,577		$	1,103
	Denominator:
	Weighted-average shares used in computing net income per share attributable to common stockholders - basic	32,088				5,843			31,789			5,540
	Effect of potentially dilutive securities:
	Convertible preferred stock	—				17,597			—			17,597
	Common stock options	4,159				3,105			3,915			2,829
	Contingently issuable shares related to an acquisition	—				—			—			6
	Weighted-average shares used in computing net income per share attributable to common stockholders - diluted	36,247				26,545			35,704			25,972
	Net income per share attributable to common stockholders:
	Basic	$	0.04			$	0.07		$	0.05		$	0.05
	Diluted	$	0.04			$	0.06		$	0.04		$	0.04
	All of the convertible preferred stock automatically converted to common stock on a 1-for-1 basis in connection with the consummation of the Company's initial public offering. For the three and nine months ended September 30, 2012, the amounts presented in the table above were the weighted average shares of common stock underlying outstanding shares of convertible preferred stock.
	The following shares were excluded in the calculation of diluted net income per share because their inclusion would have been anti-dilutive:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
		(in thousands)
	Common stock options	394			1,108			956		1,031
		394			1,108			956		1,031

The_Company_and_Summary_of_Sig1

The Company and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
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.
Basis of presentation	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared by the Company in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information as well as the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations.  The condensed consolidated balance sheet as of December 31, 2012, included herein, was derived from the audited financial statements as of that date but does not include all disclosures, including notes required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the financial position, results of operations and cash flows for the interim periods. The results of operations for the three and nine month periods ended September 30, 2013 is not necessarily indicative of the results of operations expected for the entire year ending December 31, 2013 or for any other future annual or interim period. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 filed with the SEC on March 5, 2013.
	Certain prior year amounts have been reclassified to conform to the current year presentation. These reclassifications did not change previously reported total assets, liabilities, stockholders' equity, income from operations or net income.
Principles of consolidation	'
	Principles of Consolidation
	The accompanying condensed 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.
Use of estimates	'
	Use of Estimates
	The preparation of the condensed 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 condensed 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 condensed consolidated financial statements.
Concentration of credit risk	'
	Concentration of Credit Risk
	The Company invests its cash, cash equivalents and investments with major financial institutions. Cash balances with any one institution at times may be in excess of federally insured limits. Cash equivalents and investments are invested in high-quality investment grade financial instruments and are diversified. The Company has not experienced any other-than-temporary 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 September 30, 2013 and December 31, 2012, 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, 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 corporate bonds, 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 is stated at cost, which approximates fair market value. Cash equivalents and 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 condensed 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.
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 February 2013, the FASB issued an update to ASC 220: Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. Under this update, an entity is required to provide information about the amounts reclassified out of accumulated other comprehensive income (”AOCI”) by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required to be reclassified in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. The Company adopted this standard in the first quarter of 2013, and the adoption of this standard did not have a material impact on the condensed consolidated financial statements. Amounts reclassified out of AOCI are recorded in interest income on the condensed consolidated statements of operations.
	In July 2013, the FASB issued ASU 2013-11: Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This update 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 will adopt this amendment as of January 2014. The result of adoption may be to offset certain long-term liabilities to long-term deferred tax assets and the adoption will not result in a change to the tax provision. The Company does not believe that the impact on the balance sheet will be significant.

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Schedule of Cash and Cash Equivalents, Available-for-sale Securities, Restricted Cash Reconciliation	'
	The Company's cash and cash equivalents, short-term investments, long-term investments and restricted cash consist of the following:
		30-Sep-13
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
		(in thousands)
	Cash and cash equivalents:
	Cash	$	25,434	$	—	$	—		$	25,434
	Money market funds	5,086		—		—			5,086
	Commercial paper	11,597		1		—			11,598
	Total	42,117		1		—			42,118
	Short-term investments:
	Commercial paper	43,960		14		(1		)	43,973
	Corporate bonds	9,640		7		—			9,647
	Municipal bonds	1,127		—		(1		)	1,126
	U.S. government agencies	4,001		1		—			4,002
	Total	58,728		22		(2		)	58,748
	Long-term investments:
	Asset-backed securities	3,996		3		(1		)	3,998
	U.S. government agencies	4,711		2		—			4,713
	Corporate bonds	16,083		13		(2		)	16,094
	Total	24,790		18		(3		)	24,805
	Total	$	125,635	$	41	$	(5	)	$	125,671
		31-Dec-12
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
		(in thousands)
	Cash and cash equivalents:
	Cash	$	23,419	$	—	$	—		$	23,419
	Money market funds	170		—		—			170
	Commercial paper	11,294		2		—			11,296
	Total	34,883		2		—			34,885
	Short-term investments:
	Commercial paper	21,078		2		—			21,080
	U.S. government agencies	62,463		4		—			62,467
	Total	83,541		6		—			83,547
	Restricted cash - cash	114		—		—			114
	Total	$	118,538	$	8	$	—		$	118,546
Schedule of Assets Measured on Recurring Basis	'
	lowing 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:
		30-Sep-13
		Level 1		Level 2		Level 3			Fair Value
		(in thousands)
	Commercial paper	$	—	$	55,571	$	—		$	55,571
	U.S. government agencies	—		8,715		—			8,715
	Municipal bonds	—		1,126		—			1,126
	Corporate bonds	—		25,741		—			25,741
	Asset-backed securities	—		3,998		—			3,998
	Total	$	—	$	95,151	$	—		$	95,151
		31-Dec-12
		Level 1		Level 2		Level 3			Fair Value
		(in thousands)
	Commercial paper	$	—	$	32,376	$	—		$	32,376
	U.S. government agencies	—		62,467		—			62,467
	Total	$	—	$	94,843	$	—		$	94,843
Schedule of Available-for-Sale Securities by Contractual Maturity	'
	The following summarizes the fair value of securities classified as available-for-sale by contractual maturity:
		30-Sep-13
		Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
	Commercial paper	$	55,571	$	—	$	—		$	55,571
	U.S. government agencies	4,002		4,713		—			8,715
	Municipal bonds	1,126		—		—			1,126
	Corporate bonds	9,647		16,094		—			25,741
	Asset-backed securities	—		—		3,998			3,998
	Total	$	70,346	$	20,807	$	3,998		$	95,151
		31-Dec-12
		Mature within One Year		After One Year through Two Years		Over Two Years			Fair Value
		(in thousands)
	Commercial paper	$	32,376	$	—	$	—		$	32,376
	U.S. government agencies	62,467		—		—			62,467
	Total	$	94,843	$	—	$	—		$	94,843

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property and equipment	'
	Property and equipment, which includes assets under capital lease, consists of the following:
		September 30,			December 31,
		2013			2012
		(in thousands)
	Computer equipment	$	25,613		$	18,798
	Computer software	9,139			6,327
	Furniture, fixtures and equipment	1,758			1,545
	Scanner appliances	16,646			16,470
	Leasehold improvements	1,876			1,672
	Total property and equipment	55,032			44,812
	Less: accumulated depreciation and amortization	(32,539		)	(26,664		)
	Property and equipment, net	$	22,493		$	18,148

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Carrying value of intangible assets	'
	The carrying values of intangible assets are as follows (in thousands):
						September 30, 2013					31-Dec-12
		Estimated Lives		Cost		Accumulated Amortization			Net Book Value		Accumulated Amortization			Net Book Value
	Existing technology	7 years		$	1,910	(842		)	$	1,068	$	(637	)	$	1,273
	Patent license	14 years		1,388		(297		)	1,091		(223		)	1,165
	Non-competition agreements and other	3 years		171		(133		)	38		(93		)	78
	Total intangibles subject to amortization			$	3,469	$	(1,272	)	2,197		$	(953	)	2,516
	Intangible assets not subject to amortization								295					295
	Total intangible assets, net								$	2,492				$	2,811
Intangible assets future periods amortization expense	'
	As of September 30, 2013, the Company expects amortization expense in future periods to be as follows (in thousands):
	Remainder of 2013	$	98
	2014	392
	2015	385
	2016	372
	2017	281
	2018 and thereafter	669
	Total expected future amortization expense	$	2,197

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Lease Payments for Capital and Operating Leases	'
	The following are the minimum annual lease payments due under these leases at September 30, 2013:
		Operating Leases		Capital Leases
		(in thousands)
	Remainder of 2013	$	1,026	$	268
	2014	3,693		815
	2015	2,676		—
	2016	1,850		—
	2017	1,623		—
	2018 and thereafter	295		—
	Total minimum lease payments	$	11,163	1,083
	Less amount representing interest			(12		)
	Present value of minimum payments			1,071
	Less current portion			(1,071		)
	Capital lease obligations, noncurrent			$	—

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-based employee compensation	'
	tock-based compensation is included in the condensed consolidated statements of operations as follows:
		Three Months Ended								Nine months ended
		September 30,								September 30,
		2013				2012				2013			2012
		(in thousands)
	Cost of revenues	$	103			$	68			$	297		$	191
	Research and development	253				167				687			461
	Sales and marketing	363				306				804			746
	General and administrative	507				244				1,299			723
	Total stock-based employee compensation	$	1,226			$	785			$	3,087		$	2,121
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:
		Three Months Ended				Nine months ended
		September 30,				September 30,
		2013		2012		2013		2012
	Expected term (in years)	5.4 to 6.1		5.3 to 6.0		5.4 to 6.1		5.3 to 6.0
	Volatility	52% to 53%		53%		52% to 53%		53%
	Risk-free interest rate	1.4% to 1.5%		0.6% to 0.7%		0.7% to 1.5%		0.6% to 0.8%
	Dividend yield	—		—		—		—
Stock option activity	'
	summary of the Company’s stock option activity is as follows:
		Outstanding Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
											(in thousands)
	Balance as of December 31, 2012	6,513,508			$	4.39			6.6		$	67,711
	Granted	1,412,325			13.34
	Exercised	(816,166	)		4.13
	Canceled	(339,713	)		9.07
	Balance as of September 30, 2013	6,769,954			6.06				6.5		103,805
	Vested and expected to vest - September 30, 2013	6,109,405			5.53				6.3		96,911
	Exercisable - September 30, 2013	5,406,675			4.19				5.7		82,897

Other_Income_Expense_Net_Table

Other Income (Expense), Net (Tables)	9 Months Ended
	Sep. 30, 2013
Other Income and Expenses [Abstract]	'
Schedule of Other Nonoperating Income (Expense)	'
	Other income (expense), net consists of the following:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013			2012
		(in thousands)
	Foreign exchange gains (losses), net	$	(60	)	$	52	$	(474	)	$	(42	)
	Other income (expense)	(24		)	8		104			(2		)
	Other income (expense), net	$	(84	)	$	60	$	(370	)	$	(44	)

Segment_Information_and_Inform1

Segment Information and Information about Geographic Area (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Revenues by geographic area	'
	Revenues by geographic area, based on the location of the customer, are as follows:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(in thousands)
	United States	$	19,943	$	16,063	$	55,750	$	45,644
	Other	7,806		7,319		23,173		21,119
	Total revenues	$	27,749	$	23,382	$	78,923	$	66,763

Net_Income_Loss_Per_Share_Attr1

Net Income (Loss) Per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2013
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:
		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2013				2012			2013			2012
		(in thousands)
	Numerator:
	Net income	$	1,309			$	1,667		$	1,579		$	1,105
	Net income attributable to participating securities	(2		)		(1,252		)	(2		)	(841		)
	Net income attributable to common stockholders - basic	1,307				415			1,577			264
	Undistributed earnings reallocated to participating securities	1				1,249			—			839
	Net income attributable to common stockholders - diluted	$	1,308			$	1,664		$	1,577		$	1,103
	Denominator:
	Weighted-average shares used in computing net income per share attributable to common stockholders - basic	32,088				5,843			31,789			5,540
	Effect of potentially dilutive securities:
	Convertible preferred stock	—				17,597			—			17,597
	Common stock options	4,159				3,105			3,915			2,829
	Contingently issuable shares related to an acquisition	—				—			—			6
	Weighted-average shares used in computing net income per share attributable to common stockholders - diluted	36,247				26,545			35,704			25,972
	Net income per share attributable to common stockholders:
	Basic	$	0.04			$	0.07		$	0.05		$	0.05
	Diluted	$	0.04			$	0.06		$	0.04		$	0.04
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	'
	The following shares were excluded in the calculation of diluted net income per share because their inclusion would have been anti-dilutive:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
		(in thousands)
	Common stock options	394			1,108			956		1,031
		394			1,108			956		1,031

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments -Cash and Cash Equivalents, Available-for-sale Securities, Restricted Cash Reconciliation (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Cash and cash equivalents	$42,118	$34,885	$25,804	$24,548
Amortized cost	125,635	118,538	'	'
Unrealized gains	41	8	'	'
Unrealized losses	-5	0	'	'
Fair value	125,671	118,546	'	'
Restricted cash- cash	0	114	'	'
Cash and Cash Equivalents	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Cash and cash equivalents	25,434	23,419	'	'
Amortized cost	42,117	34,883	'	'
Unrealized gains	1	2	'	'
Unrealized losses	0	0	'	'
Fair value	42,118	34,885	'	'
Short-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	58,728	83,541	'	'
Unrealized gains	22	6	'	'
Unrealized losses	-2	0	'	'
Fair value	58,748	83,547	'	'
Long-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	24,790	'	'	'
Unrealized gains	18	'	'	'
Unrealized losses	-3	'	'	'
Fair value	24,805	'	'	'
Restricted Cash	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Restricted cash- cash	'	114	'	'
Money Market Funds	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Unrealized gains	0	0	'	'
Unrealized losses	0	0	'	'
Money Market Funds | Cash and Cash Equivalents	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	5,086	170	'	'
Fair value	5,086	170	'	'
Commercial Paper | Cash and Cash Equivalents	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	11,597	11,294	'	'
Unrealized gains	1	2	'	'
Unrealized losses	0	0	'	'
Fair value	11,598	11,296	'	'
Commercial Paper | Short-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	43,960	21,078	'	'
Unrealized gains	14	2	'	'
Unrealized losses	-1	0	'	'
Fair value	43,973	21,080	'	'
Corporate bonds | Short-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	9,640	'	'	'
Unrealized gains	7	'	'	'
Unrealized losses	0	'	'	'
Fair value	9,647	'	'	'
Corporate bonds | Long-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	16,083	'	'	'
Unrealized gains	13	'	'	'
Unrealized losses	-2	'	'	'
Fair value	16,094	'	'	'
Municipal bonds | Short-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	1,127	'	'	'
Unrealized gains	0	'	'	'
Unrealized losses	-1	'	'	'
Fair value	1,126	'	'	'
US Government Agencies | Short-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	4,001	62,463	'	'
Unrealized gains	1	4	'	'
Unrealized losses	0	0	'	'
Fair value	4,002	62,467	'	'
US Government Agencies | Long-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	4,711	'	'	'
Unrealized gains	2	'	'	'
Unrealized losses	0	'	'	'
Fair value	4,713	'	'	'
Asset backed securities | Long-term Investments	'	'	'	'
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]	'	'	'	'
Amortized cost	3,996	'	'	'
Unrealized gains	3	'	'	'
Unrealized losses	-1	'	'	'
Fair value	$3,998	'	'	'

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments -Fair Value Hierarchy (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	$95,151	$94,843
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	95,151	94,843
Level 3 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	0
Fair Value | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	95,151	94,843
Commercial Paper	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	55,571	32,376
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	55,571	32,376
Commercial Paper | Level 3 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	0
Commercial Paper | Fair Value | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	55,571	32,376
US Government Agencies	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	8,715	62,467
US Government Agencies | Level 1 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	0
US Government Agencies | Level 2 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	8,715	62,467
US Government Agencies | Level 3 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	0
US Government Agencies | Fair Value | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	8,715	62,467
Municipal bonds	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	1,126	'
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	1,126	'
Municipal bonds | Level 3 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	'
Municipal bonds | Fair Value | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	1,126	'
Corporate bonds	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	25,741	'
Corporate bonds | Level 1 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	'
Corporate bonds | Level 2 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	25,741	'
Corporate bonds | Level 3 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	'
Corporate bonds | Fair Value | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	25,741	'
Asset backed securities	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	3,998	'
Asset backed securities | Level 1 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	'
Asset backed securities | Level 2 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	3,998	'
Asset backed securities | Level 3 | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	0	'
Asset backed securities | Fair Value | Recurring Basis	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities, fair value	$3,998	'

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments - Contractual Maturity (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Mature within one year	$70,346	$94,843
After one year through two years	20,807	0
Over two years	3,998	0
Fair value	95,151	94,843
Commercial Paper	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Mature within one year	55,571	32,376
After one year through two years	0	0
Over two years	0	0
Fair value	55,571	32,376
US Government Agencies	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Mature within one year	4,002	62,467
After one year through two years	4,713	0
Over two years	0	0
Fair value	8,715	62,467
Municipal bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Mature within one year	1,126	'
After one year through two years	0	'
Over two years	0	'
Fair value	1,126	'
Corporate bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Mature within one year	9,647	'
After one year through two years	16,094	'
Over two years	0	'
Fair value	25,741	'
Asset backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Mature within one year	0	'
After one year through two years	0	'
Over two years	3,998	'
Fair value	$3,998	'

Fair_Value_of_Financial_Instru5

Fair Value of Financial Instruments - Derivatives (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	Forward Contracts	Forward Contracts	Forward Contracts
	derivative		derivative		derivative	EUR (€)	GBP (£)	EUR (€)
Derivatives, Fair Value [Line Items]	'	'	'	'	'	'	'	'
Derivative, number of instruments held	2	'	2	'	1	'	'	'
Derivative, notional amount	'	'	'	'	'	€ 4,200,000	£ 1,900,000	€ 10,700,000
Foreign currency contract, asset, fair value disclosure	0	'	0	'	0	'	'	'
Derivative instruments not designated as hedging instruments, loss	400,000	400,000	600,000	100,000	'	'	'	'
Foreign currency transaction gain, before tax	$300,000	$400,000	$100,000	$49,000	'	'	'	'

Property_and_Equipment_Net_Det

Property and Equipment, Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	$55,032,000	'	$55,032,000	'	$44,812,000
Depreciation and amortization expense	2,400,000	6,700,000	1,700,000	5,100,000	'
Less: accumulated depreciation and amortization	-32,539,000	'	-32,539,000	'	-26,664,000
Property and equipment, net	22,493,000	'	22,493,000	'	18,148,000
Capital lease	3,800,000	'	3,800,000	'	3,800,000
Capital lease, accumulated depreciation	1,700,000	'	1,700,000	'	1,200,000
Computer equipment	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	25,613,000	'	25,613,000	'	18,798,000
Computer software	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	9,139,000	'	9,139,000	'	6,327,000
Furniture, fixtures and equipment	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	1,758,000	'	1,758,000	'	1,545,000
Scanner appliances	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	16,646,000	'	16,646,000	'	16,470,000
Scanner appliances and other computer equipment subject to subscription	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment, net	4,900,000	'	4,900,000	'	5,500,000
Scanner appliances and other computer equipment not placed in service	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	1,000,000	'	1,000,000	'	1,500,000
Leasehold improvements	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	1,876,000	'	1,876,000	'	1,672,000
Other fixed assets not placed in service	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment	$1,700,000	'	$1,700,000	'	$1,700,000

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets, Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Schedule of Goodwill and Intangible Assets [Line Items]	'	'	'	'	'
Cost	$3,469,000	'	$3,469,000	'	$3,469,000
Accumulated Amortization	-1,272,000	'	-1,272,000	'	-953,000
Net Book Value	2,197,000	'	2,197,000	'	2,516,000
Intangible assets not subject to amortization	295,000	'	295,000	'	295,000
Total intangible assets, net	2,492,000	'	2,492,000	'	2,811,000
Amortization of intangible assets	100,000	100,000	300,000	200,000	'
Goodwill	317,000	'	317,000	'	317,000
Existing technology	'	'	'	'	'
Schedule of Goodwill and Intangible Assets [Line Items]	'	'	'	'	'
Estimated Lives	'	'	'7 years	'	'
Cost	1,910,000	'	1,910,000	'	1,910,000
Accumulated Amortization	-842,000	'	-842,000	'	-637,000
Net Book Value	1,068,000	'	1,068,000	'	1,273,000
Patent license	'	'	'	'	'
Schedule of Goodwill and Intangible Assets [Line Items]	'	'	'	'	'
Estimated Lives	'	'	'14 years	'	'
Cost	1,388,000	'	1,388,000	'	1,388,000
Accumulated Amortization	-297,000	'	-297,000	'	-223,000
Net Book Value	1,091,000	'	1,091,000	'	1,165,000
Non-competition agreements and other	'	'	'	'	'
Schedule of Goodwill and Intangible Assets [Line Items]	'	'	'	'	'
Estimated Lives	'	'	'3 years	'	'
Cost	171,000	'	171,000	'	171,000
Accumulated Amortization	-133,000	'	-133,000	'	-93,000
Net Book Value	$38,000	'	$38,000	'	$78,000

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets, Net Future Amortization (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'	'
Remainder of 2013	$98	'
2014	392	'
2015	385	'
2016	372	'
2017	281	'
2018 and thereafter	669	'
Net Book Value	$2,197	$2,516

Commitments_and_Contingencies_1

Commitments and Contingencies - Lease Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2011	Sep. 30, 2013	Dec. 31, 2012
						Capital Lease Obligations	Capital Lease Obligations	Capital Addition Purchase Commitments	Maintenance and Support	Maintenance and Support
						Minimum	Maximum	Capital Lease Obligations
Leased Assets [Line Items]	'	'	'	'	'	'	'	'	'	'
Debt interest rate	'	'	'	'	'	1.80%	4.00%	'	'	'
Debt face amount	'	'	'	'	'	'	'	$3.10	'	'
Recorded unconditional purchase obligation	'	'	'	'	'	'	'	'	0.4	1.6
Rent expense	1.3	1.1	4	3.1	'	'	'	'	'	'
Deferred rent credit	0.5	'	0.5	'	0.5	'	'	'	'	'
Sales and excise tax payable, current	$0.40	'	$0.40	'	$0.40	'	'	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Leases (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Operating Leases	'	'
Remainder of 2013	$1,026	'
2014	3,693	'
2015	2,676	'
2016	1,850	'
2017	1,623	'
2018 and thereafter	295	'
Total mimimum lease payments	11,163	'
Capital Leases	'	'
Remainder of 2013	268	'
2014	815	'
2015	0	'
2016	0	'
2017	0	'
2018 and thereafter	0	'
Total minimum lease payments	1,083	'
Less amount representing interest	-12	'
Present value of minimum payments	1,071	'
Less current portion	-1,071	-1,183
Capital lease obligations, noncurrent	$0	$808

Commitments_and_Contingencies_3

Commitments and Contingencies - Sales and Other Taxes (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'	'
Sales and excise tax payable, current	$0.40	$0.40

StockBased_Compensation_Plan_I

Stock-Based Compensation - Plan Information (Details) (USD $)	3 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 26, 2012	Sep. 26, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 26, 2012	Sep. 26, 2012
	Stock Options	Stock Options	Stock Options	2012 Equity Incentive Plan	2012 Equity Incentive Plan	2012 Equity Incentive Plan	2000 Equity Incentive Plan	2000 Equity Incentive Plan	2000 Equity Incentive Plan	Increase of Number of Shares Option	Increase of Percentage of Shares Outstanding Option
						Stock Options	Stock Options	Stock Options	Stock Options
									Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Number of shares authorized	'	'	'	'	3,050,000	'	'	'	'	'	'
Equity incentive plan annual increase (shares)	'	'	'	'	'	'	'	'	'	3,050,000	'
Equity incentive plan, annual increase, percent of shares outstanding	'	'	'	'	'	'	'	'	'	'	5.00%
Award vesting period	'	'	'	'	'	'4 years	'4 years	'	'	'	'
Term of award	'	'	'	'	'	'10 years	'10 years	'	'	'	'
Expiration period	'	'	'	'10 years	'	'	'	'	'	'	'
Number of shares available for grant	'	'	'	1,613,525	'	'	'	'	'	'	'
Award strike price as a percentage of market value	'	'	'	'	'	'	'	'	85.00%	'	'
Number of shares subject to repurchase (shares)	'	'	'	'	'	'	20,336	47,220	'	'	'
Share-based compensation arrangement by share-based payment award, number of unvested shares repurchased	125	125	60,125	'	'	'	'	'	'	'	'
Liability for options early exercised	'	'	'	'	'	'	$0.10	$0.30	'	'	'

StockBased_Compensation_Expens

Stock-Based Compensation - Expense (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'	'
Stock-based employee compensation	$1,226,000	$785,000	$3,087,000	$2,121,000	'
Unrecognized employee compensation cost	8,700,000	'	8,700,000	'	5,800,000
Unrecognized employee compensation cost, period for recognition	'	'	'2 years	'	'2 years
Non-employee share-based compensation expense	400,000	200,000	700,000	400,000	'
Cost of revenues	'	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'	'
Stock-based employee compensation	103,000	68,000	297,000	191,000	'
Research and development	'	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'	'
Stock-based employee compensation	253,000	167,000	687,000	461,000	'
Selling and marketing	'	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'	'
Stock-based employee compensation	363,000	306,000	804,000	746,000	'
General and administrative	'	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'	'
Stock-based employee compensation	$507,000	$244,000	$1,299,000	$723,000	'

StockBased_Compensation_Fair_V

Stock-Based Compensation - Fair Value Assumptions, Stock Options (Details) (Stock Options)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Volatility	'	53.00%	'	53.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expected term (in years)	'5 years 4 months 24 days	'5 years 3 months 18 days	'5 years 4 months 24 days	'5 years 3 months 18 days
Volatility	52.00%	'	52.00%	'
Risk-free interest rate	1.40%	0.60%	0.70%	0.60%
Maximum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expected term (in years)	'6 years 1 month 6 days	'6 years	'6 years 1 month 6 days	'6 years
Volatility	53.00%	'	53.00%	'
Risk-free interest rate	1.50%	0.70%	1.50%	0.80%

StockBased_Compensation_Stock_

Stock-Based Compensation - Stock Option Activity (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Outstanding Shares	'	'
Beginning balance (in shares)	6,513,508	'
Granted (in shares)	1,412,325	'
Exercised (in shares)	-816,166	'
Canceled (in shares)	-339,713	'
Ending balance (in shares)	6,769,954	6,513,508
Vested and expected to vest (in shares)	6,109,405	'
Exercisable (in shares)	5,406,675	'
Weighted Average Exercise Price	'	'
Beginning balance (in dollars per share)	$4.39	'
Weighted average exercise price, granted (in dollars per share)	$13.34	'
Weighted average exercise price, exercised (in dollars per share)	$4.13	'
Weighted average exercise price, canceled (in dollars per share)	$9.07	'
Ending balance (in dollars per share)	$6.06	$4.39
Vested and expected to vest (in dollars per share)	$5.53	'
Exercisable (in dollars per share)	$4.19	'
Weighted Average Remaining Contractual Life	'	'
Weighted average remaining contractual life	'6 years 6 months 7 days	'6 years 7 months 6 days
Vested and expected to vest	'6 years 3 months 7 days	'
Exercisable	'5 years 8 months 7 days	'
Aggregate Intrinsic Value	'	'
Aggregate intrinsic value	$103,805	$67,711
Vested and expected to vest	96,911	'
Exercisable	$82,897	'

StockBased_Compensation_Restri

Stock-Based Compensation - Restricted Stock (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based employee compensation	$1,226	$785	$3,087	$2,121
Restricted Stock	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Shares granted	1,900	2,750	'	'
Stock-based employee compensation	$20	$32	'	'

Other_Income_Expense_Net_Detai

Other Income (Expense), Net (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income and Expenses [Abstract]	'	'	'	'
Foreign exchange gains (losses), net	($60)	$52	($474)	($42)
Other income (expense)	-24	8	104	-2
Other income (expense), net	($84)	$60	($370)	($44)

Income_Taxes_Details

Income Taxes (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Unrecognized tax benefits	$3.10	$2.60
Unrecognized Tax benefits that would impact effective tax rate	$0.90	$1

Segment_Information_and_Inform2

Segment Information and Information about Geographic Area (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
			segment
Segment Reporting Information [Line Items]	'	'	'	'
Number of operating segments	'	'	1	'
Revenues	$27,749	$23,382	$78,923	$66,763
United States	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	19,943	16,063	55,750	45,644
Other	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	$7,806	$7,319	$23,173	$21,119

Net_Income_Loss_Per_Share_Attr2

Net Income (Loss) Per Share Attributable to Common Stockholders (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:	'	'	'	'
Net income	$1,309	$1,667	$1,579	$1,105
Net income attributable to participating securities	-2	-1,252	-2	-841
Net income attributable to common stockholders - basic	1,307	415	1,577	264
Undistributed earnings allocated to participating securities	1	1,249	0	839
Net income attributable to common stockholders - diluted	$1,308	$1,664	$1,577	$1,103
Denominator:	'	'	'	'
Weighted - average shares used in computing net income per share attributable to common stockholders - basic (shares)	32,088	5,843	31,789	5,540
Effect of potentially dilutive securities: Convertible preferred stock	0	17,597	0	17,597
Effect of potentially dilutive securities: Common stock options	4,159	3,105	3,915	2,829
Effect of potentially dilutive securities: Contingently issuable shares	'	0	0	6
Weighted - average shares used in computing net income per share attributable to common stockholders - diluted (shares)	36,247	26,545	35,704	25,972
Basic (USD per share)	$0.04	$0.07	$0.05	$0.05
Diluted (USD per share)	$0.04	$0.06	$0.04	$0.04
Antidilutive Securities	'	'	'	'
Antidilutive securities	394	1,108	956	1,031
Stock Options	'	'	'	'
Antidilutive Securities	'	'	'	'
Antidilutive securities	394	1,108	956	1,031