Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Total stockholders' equity, beginning balance at Dec. 31, 2012	$ 72,901	$ 270	$ 1,281,170	$ (1,201,515)	$ (6,528)	$ (496)
Common stock outstanding (shares) at Dec. 31, 2012		7,594
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares	(3,884)				(3,884)
Purchase of treasury shares (shares)		(389)
Share-based compensation	713		713
Share-based compensation (shares)		81
Net loss	(6,822)			(6,822)
Other comprehensive income (loss)	882					882
Total stockholders' equity, ending balance at Dec. 31, 2013	63,790	$ 270	1,281,883	(1,208,337)	(10,412)	386
Common stock outstanding (shares) at Dec. 31, 2013		7,286
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and warrants	1,641		1,641
Exercise of stock options and warrants (shares)		100
Share-based compensation	959		959
Net loss	(12,155)			(12,155)
Other comprehensive income (loss)	(3,265)					(3,265)
Total stockholders' equity, ending balance at Dec. 31, 2014	$ 50,970	$ 270	1,284,483	(1,220,492)	(10,412)	(2,879)
Common stock outstanding (shares) at Dec. 31, 2014	7,386	7,386
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares	$ (4,943)				(4,943)
Purchase of treasury shares (shares)		(502)
Exercise of stock options and warrants	140		140
Exercise of stock options and warrants (shares)		98
Share-based compensation	1,164		1,164
Net loss	(7,179)			(7,179)
Other comprehensive income (loss)	1,294					1,294
Total stockholders' equity, ending balance at Dec. 31, 2015	$ 41,446	$ 270	$ 1,285,787	$ (1,227,671)	$ (15,355)	$ (1,585)
Common stock outstanding (shares) at Dec. 31, 2015	6,982	6,982