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, 2015	$ 464	$ 548,304	$ (474,522)	$ (5,168)	$ 69,078
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(3,219)	0	(3,219)
Balance at Dec. 31, 2016	464	548,304	(477,741)	(5,168)	65,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(48,057)	0	(48,057)
Balance at Dec. 31, 2017	$ 464	$ 548,304	$ (525,798)	$ (5,168)	$ 17,802