Statement of Stockholders’ Equity (Unaudited) - 9 months ended Sep. 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	2,080		2,080
Net loss	(11,396)			(11,396)
Ending balance (shares) at Sep. 30, 2018		38,252,765
Ending balance at Sep. 30, 2018	$ 225,721	$ 383	$ 328,598	$ (101,041)	$ (2,219)