Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2022	$ 464	$ 548,304	$ (544,674)	$ (5,168)	$ (1,074)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,220)	0	(1,220)
Balance at Mar. 31, 2023	464	548,304	(545,894)	(5,168)	(2,294)
Balance at Dec. 31, 2023	464	548,304	(549,945)	(5,168)	(6,345)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,839)	0	(1,839)
Balance at Mar. 31, 2024	$ 464	$ 548,304	$ (551,784)	$ (5,168)	$ (8,184)