Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	IPO [Member]	Common Stock 0.00001 Par Value [Member]	Common Stock 0.00001 Par Value [Member] IPO [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] IPO [Member]	Accumulated Deficit [Member]	Series C Convertible Preferred Stock 0.00001 Par Value [Member]	Series B Convertible Preferred Stock 0.00001 Par Value [Member]	Series A Convertible Preferred Stock 0.00001 Par Value [Member]
Beginning balance at Dec. 31, 2013	$ (61,966)				$ 270,794		$ (332,760)
Beginning balance, shares at Dec. 31, 2013			3,137					20,000	1,601,053	5,284,347
Net loss	(66,324)						(66,324)
Issuance of stock	3	$ 74,712			3	$ 74,712
Issuance of stock, shares			31	7,500,000
Stock compensation expense	8,781				8,781
Net cashless exercise of Series C warrants, shares								86,997,362
Conversion of convertible preferred stock to common stock, shares			115,982					(87,017,362)	(1,601,053)	(5,284,347)
Conversion of convertible debt to common stock	168,510				168,510
Conversion of convertible debt to common stock, shares			15,319,034
Issuance of Restricted Stock, shares			61,816
Forfeiture of Restricted Stock, shares			(7,727)
Ending balance at Dec. 31, 2014	123,716				522,800		(399,084)
Ending balance, shares at Dec. 31, 2014			22,992,273
Net loss	(6,417)						(6,417)
Stock compensation expense	5,413				5,413
Issuance of Restricted Stock, shares			132,130
Vesting of restricted stock units	(238)				(238)
Vesting of restricted stock units, shares			60,449
Ending balance at Dec. 31, 2015	122,474				527,975		(405,501)
Ending balance, shares at Dec. 31, 2015			23,184,852
Net loss	(12,023)						(12,023)
Stock compensation expense	5,313				5,313
Issuance of Restricted Stock, shares			75,152
Vesting of restricted stock units	(200)				(200)
Vesting of restricted stock units, shares			109,834
Ending balance at Dec. 31, 2016	$ 115,564				$ 533,088		$ (417,524)
Ending balance, shares at Dec. 31, 2016			23,369,838