Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2020	$ 464	$ 548,304	$ (535,993)	$ (5,168)	$ 7,607
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,635)	0	(1,635)
Balance at Mar. 31, 2021	464	548,304	(537,628)	(5,168)	5,972
Balance at Dec. 31, 2021	464	548,304	(541,201)	(5,168)	2,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,057)	0	(1,057)
Balance at Mar. 31, 2022	$ 464	$ 548,304	$ (542,258)	$ (5,168)	$ 1,342