CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Convertible Preferred Stock	Redeemable Common Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Balance as of beginning of the period at Dec. 31, 2013	$ 71,655	$ 2,852
Balance as of beginning of the period (in shares) at Dec. 31, 2013	37,590,286	113,294
Temporary Equity
Issuance of Series F preferred stock, net of issuance costs	$ 50,082
Issuance of Series F preferred stock, net of issuance costs (in shares)	11,329,068
Accretion of Seried F preferred stock to redemption amount	$ 168
Preferred dividend	2,920
Preferred dividends retired and converted to Series F preferred stock	$ (6,892)			$ 6,892			$ 6,892
Preferred dividends retired and converted to Series F preferred stock (in shares)	1,553,917
Repurchase of convertible preferred and common stock	$ (19)
Repurchase of convertible preferred and common stock (in shares)	(20,332)
Balance as of end of the period at Dec. 31, 2014	$ 117,914	$ 2,852
Balance as of end of the period (in shares) at Dec. 31, 2014	50,452,939	113,294					50,452,939
Balance as of beginning of the period at Dec. 31, 2013			$ 1		$ (55,453)		$ (55,452)
Balance as of beginning of the period (in shares) at Dec. 31, 2013			1,302,759
Stockholders' Equity
Accretion of Seried F preferred stock to redemption amount				(168)			(168)
Preferred dividend				(2,920)			(2,920)
Preferred dividends retired and converted to Series F preferred stock	$ (6,892)			6,892			6,892
Warrants issued				219			219
Repurchase of convertible preferred and common stock				(349)			(349)
Repurchase of convertible preferred and common stock (in shares)			(50,834)
Exercise of stock options			$ 1	746			$ 747
Exercise of stock options (in shares)			786,074				786,074
Stock-based compensation				533			$ 533
Net loss					(17,037)		(17,037)
Balance as of end of the period at Dec. 31, 2014			$ 2	4,953	(72,490)		(67,535)
Balance as of end of the period (in shares) at Dec. 31, 2014			2,037,999
Temporary Equity
Conversion of convertible preferred stock	$ (117,914)
Conversion of convertible preferred stock (in shares)	(50,452,939)
Conversion of redeemable common stock		$ (2,852)
Conversion of redeemable common stock (in shares)		(113,294)
Stockholders' Equity
Exercise of stock options				428			$ 428
Exercise of stock options (in shares)			270,545				270,545
Exercise of warrants				(1)			$ (1)
Exercise of warrants (in shares)			114,111
Issuance of stock in acquisition			$ 1	16,774			16,775
Issuance of stock in acquisition (in shares)			1,051,033
Issuance of stock			$ 9	163,109			163,118
Issuance of stock (in shares)			9,487,500
Conversion of convertible preferred stock			$ 26	117,888			117,914
Conversion of convertible preferred stock (in shares)			25,450,440
Conversion of redeemable common stock				2,852			2,852
Conversion of redeemable common stock (in shares)			113,294
Stock-based compensation				3,075			3,075
Other comprehensive income (loss), net of tax						$ (42)	(42)
Net loss					(58,020)		(58,020)
Balance as of end of the period at Dec. 31, 2015			$ 38	309,078	(130,510)	(42)	178,564
Balance as of end of the period (in shares) at Dec. 31, 2015			38,524,922
Stockholders' Equity
Warrants issued				7,717			7,717
Exercise of stock options			$ 1	2,523			$ 2,524
Exercise of stock options (in shares)			594,555				594,555
Exercise of warrants (in shares)			107,931
Issuance of stock in acquisition			$ 7	108,260			$ 108,267
Issuance of stock in acquisition (in shares)			6,955,796
Issuance of stock				250			250
Issuance of stock (in shares)			18,359
Stock-based compensation				7,723			7,723
Other comprehensive income (loss), net of tax						41	41
Net loss					(74,216)		(74,216)
Balance as of end of the period at Dec. 31, 2016			$ 46	$ 435,551	$ (204,726)	$ (1)	$ 230,870
Balance as of end of the period (in shares) at Dec. 31, 2016			46,201,563