Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2011	$ 101,044	$ 2,815	$ 252,907	$ (165,308)	$ 10,630
Balance, shares at Dec. 31, 2011		28,174
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		227
Common stock issued under employee benefit plans	1,762	22	1,740
Share-based compensation, shares		204
Share-based compensation	3,088	20	3,068
Proceeds from issuance of common stock, shares		573
Proceeds from issuance of common stock, net	10,283	57	10,226
Repurchase and cancellation, shares		(16)
Repurchase and cancellation 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 (benefit)	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		67
Common stock issued under employee benefit plans	412	7	405
Share-based compensation, shares		359
Share-based compensation	3,980	36	3,944
Repurchase and cancellation, shares		(25)
Repurchase and cancellation 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 (benefit)	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		175
Common stock issued under employee benefit plans	1,450	18	1,432
Share-based compensation, shares		312
Share-based compensation	3,964	31	3,933
Repurchase and cancellation, shares		(204)
Repurchase and cancellation of shares	1	(20)	21
Net income (loss)	(6,272)			(6,272)
Other Comprehensive Income
Foreign currency translation adjustment	(10,445)				(10,445)
Pension adjustment, net of tax provision (benefit)	(1,955)				(1,955)
Balance at Dec. 31, 2014	$ 126,953	$ 2,982	$ 277,314	$ (158,066)	$ 4,723
Balance, shares at Dec. 31, 2014		29,846