Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2016		40,977,000
Beginning Balance at Dec. 31, 2016	$ 232,936	$ 41	$ 333,883	$ (100,988)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(24,712)			(24,712)
Warrant exercise, net(in shares)		14,000
Warrant exercise, net	$ 0	$ 0	0
Option exercise, net (in shares)	33,862	34,000
Option exercise, net	$ 216	$ 0	216
Restricted stock issuances (in shares)		315,000
Restricted stock issuances	1,696		1,696
Restricted stock forfeitures (in shares)		(44,000)
Restricted stock forfeitures	(247)		(247)
Stock based compensation	1,605		1,605
Ending Balance (in shares) at Sep. 30, 2017		49,796,000
Ending Balance at Sep. 30, 2017	296,080	$ 50	421,730	$ (125,700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		8,500,000
Stock Issued During Period, Value, New Issues	$ 84,586	$ 9	$ 84,577