Statement of Stockholders’ Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance (shares) at Dec. 31, 2017		37,985,225
Beginning balance at Dec. 31, 2017	$ 235,482	$ 380	$ 326,616	$ (89,645)	$ (1,869)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
RSUs vested, net of shares withheld for taxes (shares)		350,528
RSUs vested, net of shares withheld for taxes	(95)	$ 3	(98)
Purchase of treasury stock (shares)		(82,988)
Purchase of treasury stock	(350)				(350)
Stock-based compensation	1,362		1,362
Net loss	(7,459)			(7,459)
Ending balance (shares) at Jun. 30, 2018		38,252,765
Ending balance at Jun. 30, 2018	$ 228,940	$ 383	$ 327,880	$ (97,104)	$ (2,219)