CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Total
Balance at Dec. 31, 2017	$ 3		$ 242,281	$ (72,226)	$ (531)	$ 169,527
Balance (in shares) at Dec. 31, 2017	25,832,895
Increase (Decrease) in Stockholders' Equity
Net (loss) income				966		966
Other comprehensive income (loss)					(115)	(115)
Stock-based compensation			2,921			2,921
Issuance of common stock upon exercise of stock options and vesting of restricted stock			(1,525)			(1,525)
Issuance of common stock upon exercise of stock options and vesting of restricted stock (in shares)	475,399
Repurchase of common stock for treasury		$ (7,448)				$ (7,448)
Repurchase of common stock for treasury (in shares)	(300,000)	300,000				300,000
Retirement of treasury stock		$ 7,448	(7,448)
Retirement of treasury stock (in shares)		(300,000)
Balance at Mar. 31, 2018	$ 3		236,229	(71,260)	(646)	$ 164,326
Balance (in shares) at Mar. 31, 2018	26,008,294
Balance at Dec. 31, 2018	$ 3		235,529	(28,385)	(800)	$ 206,347
Balance (in shares) at Dec. 31, 2018	26,516,912					26,516,912
Increase (Decrease) in Stockholders' Equity
Net (loss) income				(1,970)		$ (1,970)
Other comprehensive income (loss)					2	2
Stock-based compensation			3,529			3,529
Stock-based compensation (in shares)	34,854
Issuance of common stock upon exercise of stock options and vesting of restricted stock			(1,537)			(1,537)
Issuance of common stock upon exercise of stock options and vesting of restricted stock (in shares)	243,522
Repurchase of common stock for treasury		$ (2,522)				$ (2,522)
Repurchase of common stock for treasury (in shares)	(139,782)	139,782				139,782
Retirement of treasury stock		$ 2,522	(2,522)
Retirement of treasury stock (in shares)		(139,782)
Balance at Mar. 31, 2019	$ 3		$ 234,999	$ (30,355)	$ (798)	$ 203,849
Balance (in shares) at Mar. 31, 2019	26,655,506					26,655,506