CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance at Dec. 31, 2018	$ (18,578)	$ 19	$ 126,412	$ (135,160)	$ (9,849)
Increase (Decrease) in Stockholders' Equity
Net loss	(2,586)			(2,586)
Stock-based compensation expense	535		911		(376)
Payment of withholding taxes for net settlement of stock-based awards	(346)		(346)
Ending balance at Mar. 31, 2019	(20,975)	19	126,977	(137,746)	(10,225)
Beginning balance at Dec. 31, 2019	28,497	23	165,527	(126,912)	(10,141)
Increase (Decrease) in Stockholders' Equity
Net loss	(712)			(712)
Stock-based compensation expense	157		165		(8)
Payment of withholding taxes for net settlement of stock-based awards	(1)		(1)
Ending balance at Mar. 31, 2020	$ 27,941	$ 23	$ 165,691	$ (127,624)	$ (10,149)