Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	MIP Performance Units	MIP Performance Units Common Stock
Beginning balance (shares) at Dec. 31, 2014		26,762,861
Beginning balance at Dec. 31, 2014	$ 70,986	$ 268	$ 590,067	$ (520,912)	$ 1,563
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(3,226)			(3,226)
Foreign currency translation adjustments	(769)				(769)
Issuances of common stock:
Restricted share awards (shares)		23,200
Restricted share awards	0
Restricted shares remitted by employees for taxes (shares)		(17,147)
Restricted shares remitted by employees for taxes	(312)		(312)
Stock option exercises (shares)		29,128
Stock option exercises	91		91
2006 MIP Performance Unit settlements (shares)							9,918
2006 MIP Performance Unit settlements						$ 0
Forfeited restricted share awards (shares)		(7,918)
Forfeited restricted share awards	0
Repurchase of common stock (shares)		(4,118,386)
Repurchase of common stock	(18,071)	$ (41)	(18,030)
Stock-based compensation expense	3,716		3,716
Ending balance (shares) at Dec. 31, 2015		22,681,656
Ending balance at Dec. 31, 2015	52,415	$ 227	575,532	(524,138)	794
Increase (Decrease) in Stockholders' Equity
Net (loss) income	905			905
Foreign currency translation adjustments	(507)				(507)
Issuances of common stock:
Restricted shares remitted by employees for taxes (shares)		(20,829)
Restricted shares remitted by employees for taxes	(217)		(217)
Stock option exercises (shares)		90,496
Stock option exercises	320		320
2006 MIP Performance Unit settlements		$ 300
Repurchase of common stock (shares)		(905,403)
Repurchase of common stock	(3,772)	$ (9)	(3,763)
Stock-based compensation expense	$ 3,246		3,246
Ending balance (shares) at Dec. 31, 2016	21,845,920	21,845,920
Ending balance at Dec. 31, 2016	$ 52,390	$ 218	575,118	(523,233)	287
Increase (Decrease) in Stockholders' Equity
Net (loss) income	3,184			3,184
Foreign currency translation adjustments	(180)				(180)
Issuances of common stock:
Restricted share awards (shares)		381,059
Restricted share awards	0	$ 4	(4)
Restricted shares remitted by employees for taxes (shares)		(15,006)
Restricted shares remitted by employees for taxes	$ (100)		(100)
Stock option exercises (shares)	225,043	225,043
Stock option exercises	$ 1,172	$ 2	1,170
2006 MIP Performance Unit settlements		$ 1,500
Restricted stock unit settlement (shares)		10,000
Restricted stock unit settlement	0
Forfeited restricted share awards (shares)		(27,599)
Forfeited restricted share awards	0
Repurchase of common stock (shares)		0
Stock-based compensation expense	$ 3,848		3,848
Ending balance (shares) at Dec. 31, 2017	22,419,417	22,419,417
Ending balance at Dec. 31, 2017	$ 60,314	$ 224	$ 580,032	$ (520,049)	$ 107