Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2009	$ 77,992	$ 2,633	$ 224,575	$ (157,814)	$ 8,598
Balance, shares at Dec. 31, 2009		26,321,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		319,000
Common stock issued under employee benefit plans	3,290	32	3,258
Share-based compensation, shares		114,000
Share-based compensation	2,627	8	2,619
Shares issued for exercise of warrants, shares	462,000	462,000
Shares issued for exercise of warrants	8,555	46	8,509
Conversion of debenture into shares of common stock	0
Repurchase of shares, shares		(34,000)
Repurchase of shares	(546)	(4)	(542)
Net income (loss)	(6,056)			(6,056)
Other Comprehensive Income
Foreign currency translation adjustment	5,529				5,529
Pension adjustment, net of tax benefit	(3,370)				(3,370)
Realized gain on marketable securities	2				2
Balance at Dec. 31, 2010	88,023	2,715	238,419	(163,870)	10,759
Balance, shares at Dec. 31, 2010		27,182,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		310,000
Common stock issued under employee benefit plans	2,819	32	2,787
Share-based compensation, shares		177,000
Share-based compensation	2,582	17	2,565
Shares issued for exercise of warrants, shares	0
Shares issued for exercise of warrants	0
Conversion of debenture into shares of common stock, shares		514,000
Conversion of debenture into shares of common stock	9,341	51	9,290
Repurchase of shares, shares		(9,000)
Repurchase of shares	(154)	0	(154)
Net income (loss)	(1,438)			(1,438)
Other Comprehensive Income
Foreign currency translation adjustment	(628)				(628)
Pension adjustment, net of tax benefit	499				499
Realized gain on marketable securities	0
Balance at Dec. 31, 2011	101,044	2,815	252,907	(165,308)	10,630
Balance, shares at Dec. 31, 2011		28,174,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		227,000
Common stock issued under employee benefit plans	1,762	22	1,740
Share-based compensation, shares		204,000
Share-based compensation	3,088	20	3,068
Proceeds from issuance of common stock, shares		573,000
Proceeds from issuance of common stock, net	10,283	57	10,226
Conversion of debenture into shares of common stock	0
Repurchase of shares, shares		(16,000)
Repurchase of shares	(319)	(1)	(318)
Net income (loss)	7,174			7,174
Other Comprehensive Income
Foreign currency translation adjustment	1,796				1,796
Pension adjustment, net of tax benefit	105				105
Realized gain on marketable securities	0
Balance at Dec. 31, 2012	$ 124,933	$ 2,913	$ 267,623	$ (158,134)	$ 12,531
Balance, shares at Dec. 31, 2012		29,162,000