Statements of Stockholders’ Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance (shares) at Dec. 31, 2015		24,403,659
Beginning balance at Dec. 31, 2015	$ 232,737	$ 244	$ 276,948	$ (43,169)	$ (1,286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units vested (shares)		51,487
Purchase of treasury stock (shares)		(33,748)
Purchase of treasury stock	(183)				(183)
Public offering, net of offering costs of $3,305 (shares)		13,225,000
Public offering, net of offering costs of $3,305	42,983	$ 132	42,851
Stock-based compensation	2,293		2,293
Net loss	(4,605)			(4,605)
Ending balance (shares) at Jun. 30, 2016		37,646,398
Ending balance at Jun. 30, 2016	$ 273,225	$ 376	$ 322,092	$ (47,774)	$ (1,469)