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, 2017	$ 464	$ 548,304	$ (525,798)	$ (5,168)	$ 17,802
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	335	0	335
Balance at Dec. 31, 2018	464	548,304	(525,463)	(5,168)	18,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(4,926)	0	(4,926)
Balance at Dec. 31, 2019	$ 464	$ 548,304	$ (530,389)	$ (5,168)	$ 13,211