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, 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		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 provision	499				499
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
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 provision	105				105
Balance at Dec. 31, 2012	124,933	2,913	267,623	(158,134)	12,531
Balance, shares at Dec. 31, 2012		29,162,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		67,000
Common stock issued under employee benefit plans	412	7	405
Share-based compensation, shares		359,000
Share-based compensation	3,980	36	3,944
Repurchase of shares, shares		(25,000)
Repurchase of shares	(47)	(3)	(44)
Net income (loss)	6,340			6,340
Other Comprehensive Income
Foreign currency translation adjustment	2,428				2,428
Pension adjustment, net of tax provision	2,164				2,164
Balance at Dec. 31, 2013	$ 140,210	$ 2,953	$ 271,928	$ (151,794)	$ 17,123
Balance, shares at Dec. 31, 2013		29,563,000