CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance at Dec. 31, 2020	$ 6,097	$ 23	$ 157,262	$ (149,894)	$ (1,294)
Increase (Decrease) in Stockholders' Equity
Net loss	(18,150)			(18,150)
Stock-based compensation expense	109		109
Common stock issued for stock-based awards, net	(1)				(1)
Ending balance at Mar. 31, 2021	(11,945)	23	157,371	(168,044)	(1,295)
Beginning balance at Dec. 31, 2021	(42,023)	23	157,436	(198,366)	(1,116)
Increase (Decrease) in Stockholders' Equity
Net loss	(2,599)			(2,599)
Stock-based compensation expense	203		203
Ending balance at Mar. 31, 2022	$ (44,419)	$ 23	$ 157,639	$ (200,965)	$ (1,116)