Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2010	$ (69,401)		$ 5	$ 9,738	$ (818)	$ (78,326)
Convertible Preferred Stock balance at Dec. 31, 2010		63,745
Balance (in shares) at Dec. 31, 2010			4,862,351
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2010		17,562,410
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible Preferred Stock, Issuance of Series C Preferred Stock upon exercise of warrants		128
Convertible Preferred Stock, Issuance of Series C Preferred Stock upon exercise of warrants (shares)		34,848
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,954					1,954
Foreign currency translation	(166)				(166)
Issuance of common stock upon exercise of stock options	948			948
Issuance of common stock upon exercise of stock options (shares)	432,687		432,687
Change in unrealized gain (loss) on investments	0
Vesting of early exercised common stock options	52			52
Repurchase of unvested early exercised stock options	0
Repurchase of unvested early exercised stock options (shares)			(1,000)
Issuance of common stock in exchange for services	59			59
Issuance of common stock in exchange for services (shares)			6,250
Stock-based compensation	2,088			2,088
Other adjustments	42			42
Balance at Dec. 31, 2011	(64,424)		5	12,927	(984)	(76,372)
Convertible Preferred Stock balance at Dec. 31, 2011		63,873
Balance (in shares) at Dec. 31, 2011			5,300,288
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2011		17,597,258
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible Preferred Stock, Conversion of preferred stock to common stock upon initial public offering		(63,873)
Convertible Preferred Stock, Conversion of preferred stock to common stock upon initial public offering (in shares)		(17,597,258)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,280					2,280
Foreign currency translation	(59)				(59)
Issuance of common stock upon initial public offering, net of offering costs	84,534		8	84,526
Issuance of common stock upon initial public offering, net of offering costs (in shares)			7,836,250
Conversion of preferred stock to common stock upon initial public offering	63,873		17	63,856
Conversion of preferred stock to common stock upon initial public offering (shares)			17,597,258
Issuance of common stock upon exercise of stock options	1,685		1	1,684
Issuance of common stock upon exercise of stock options (shares)	724,316		724,316
Change in unrealized gain (loss) on investments	8				8
Vesting of early exercised common stock options	155			155
Repurchase of unvested early exercised stock options	0
Repurchase of unvested early exercised stock options (shares)			(60,126)
Issuance of common stock in exchange for services	45			45
Issuance of common stock in exchange for services (shares)			15,945
Issuance of common stock for acquisition of license	51			51
Issuance of common stock for acquisition of license (shares)			6,097
Stock-based compensation	3,407			3,407
Balance at Dec. 31, 2012	91,555		31	166,651	(1,035)	(74,092)
Convertible Preferred Stock balance at Dec. 31, 2012		0
Balance (in shares) at Dec. 31, 2012			31,420,028
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2012		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,624					1,624
Foreign currency translation	(83)				(83)
Issuance of common stock upon exercise of stock options	4,073		1	4,072
Issuance of common stock upon exercise of stock options (shares)	952,871		952,871
Change in unrealized gain (loss) on investments	30				30
Vesting of early exercised common stock options	262			262
Income tax benefits from exercise of stock options	150			150
Repurchase of unvested early exercised stock options	0
Repurchase of unvested early exercised stock options (shares)			(500)
Issuance of common stock in exchange for services	41			41
Issuance of common stock in exchange for services (shares)			2,900
Stock-based compensation	5,465			5,465
Balance at Dec. 31, 2013	103,117		32	176,641	(1,088)	(72,468)
Convertible Preferred Stock balance at Dec. 31, 2013		$ 0
Balance (in shares) at Dec. 31, 2013			32,375,299
Convertible Preferred Stock, balance (in shares) at Dec. 31, 2013		0