Consolidated Statements of Stock and Stockholders' Deficit - USD ($) $ in Thousands		Total	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	IPO	IPO Additional Paid-In Capital	IPO Accumulated Deficit	Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock IPO	Class A and B Common Stock		Class A and B Common Stock IPO
Balance, redeemable convertible preferred stock at Dec. 31, 2012									$ 67,332
Balance, redeemable convertible preferred stock (in shares) at Dec. 31, 2012									16,761,805
Balance at Dec. 31, 2012		$ (38,260)		$ (23)	$ (38,237)
Balance (in shares) at Dec. 31, 2012	[1]										11,064,230
Repurchases of common stock from employees		(7)	$ (7)
Repurchases of common stock from employees (in shares)	[1]										(7,007)
Reclassification of restricted stock award liability to common stock		100	100
Accretion of redeemable convertible preferred stock to redemption value		(27,892)	(1,327)		(26,565)				$ 27,892
Stock-based compensation expense		427	427
Issuance of common stock for business acquisition		782	782
Issuance of common stock for business acquisition (in shares)	[1]										93,190
Payment for services in common stock		24	24
Payment for services in common stock (in shares)	[1]										2,905
Exercise of stock options		$ 1	1
Exercise of stock options (in shares)		1,070									1,070	[1]
Other comprehensive loss		$ (43)		(43)
Net loss		(16,247)			$ (16,247)
Balance, redeemable convertible preferred stock at Dec. 31, 2013									$ 95,224
Balance, redeemable convertible preferred stock (in shares) at Dec. 31, 2013					16,761,805				16,761,805
Balance at Dec. 31, 2013		(81,115)		(66)	$ (81,049)
Balance (in shares) at Dec. 31, 2013	[1]										11,154,388
Issuance of Series G redeemable convertible preferred stock (net of issuance costs of $130)									$ 49,913
Issuance of Series G redeemable convertible preferred stock (in shares)					3,692,684				3,692,684
Issuance of common stock for contingent consideration payment		322	322
Issuance of common stock for contingent consideration payment (in shares)	[1]										29,900
Repurchases of common stock from employees		(1)	(1)
Repurchases of common stock from employees (in shares)	[1]										(2,000)
Reclassification of restricted stock award liability to common stock		102	102
Accretion of redeemable convertible preferred stock to redemption value		(21,311)	(2,173)		$ (19,138)				$ 21,311
Stock-based compensation expense		1,737	1,737
Exercise of stock options		$ 13	13
Exercise of stock options (in shares)		7,072									7,072	[1]
Other comprehensive loss		$ (66)		(66)
Net loss		(24,606)			(24,606)
Balance, redeemable convertible preferred stock at Dec. 31, 2014									$ 166,448
Balance, redeemable convertible preferred stock (in shares) at Dec. 31, 2014									20,454,489
Balance at Dec. 31, 2014		(124,925)		(132)	(124,793)
Balance (in shares) at Dec. 31, 2014	[1]										11,189,360
Reclassification of restricted stock award liability to common stock		88	88
Deemed dividend—preferred stock modification		1,748			1,748				$ (1,748)
Accretion of redeemable convertible preferred stock to redemption value		(9,862)	(4,613)		(5,249)				$ 9,862
Issuance of common stock upon initial public offering, net of offering costs of $4,024						$ 89,069	$ 89,069
Issuance of common stock upon initial public offering, net of offering costs (in shares)	[1]												7,150,000
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering						174,562	174,562			$ (174,562)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)								(20,454,489)		(20,454,489)			20,673,680	[1]
Reclassification of preferred stock warrant liability to equity in connection with initial public offering						$ 1,213	$ 1,213
Stock-based compensation expense		8,375	8,375
Issuance of common stock upon net exercise of warrants (in shares)	[1]										76,565
Issuance of common stock for business acquisition		1,500	1,500
Issuance of common stock for business acquisition (in shares)	[1]										103,617
Exercise of stock options		$ 242	242
Exercise of stock options (in shares)		34,140									34,140	[1]
Other comprehensive loss		$ (139)		(139)
Net loss		(36,088)			(36,088)
Balance at Dec. 31, 2015		$ 105,783	$ 270,436	$ (271)	$ (164,382)
Balance (in shares) at Dec. 31, 2015	[1]										39,227,362

[1] The activity through June 24, 2015 reflects the sole class of common stock authorized through the closing of the IPO on June 24, 2015, at which point the Company’s certificate of incorporation was amended and restated to authorize Class A and Class B common stock. All capital stock outstanding prior to the IPO was reclassified into Class B common stock and Class A common stock was issued in the IPO.