Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (shares) at Dec. 31, 2015		22,681,656
Beginning 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
Repurchase of common stock (shares)		(905,403)
Repurchases 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
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		$ 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
Stock option exercises	1,172	$ 2	1,170
Repurchase of common stock (shares)		(27,599)
Repurchases of common stock	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
Increase (Decrease) in Stockholders' Equity
Net (loss) income	4,593			4,593
Foreign currency translation adjustments	(1,128)				1,128
Issuances of common stock:
Restricted share awards (shares)		331,333
Restricted share awards	0	$ 3	(3)
Restricted shares remitted by employees for taxes (shares)		(155,329)
Restricted shares remitted by employees for taxes	$ (1,281)	$ (2)	(1,279)
Stock option exercises (shares)	676,649	676,649
Stock option exercises	$ 4,422	$ 7	4,415
Performance-based restricted stock, shares issued net of shares for tax withholdings	483,623
Performance-based Restricted Stock, Amount Issued Net Of Shares For Tax Withholdings		$ 5	(5)
Restricted stock unit settlement (shares)		18,934
Restricted stock unit settlement	$ 0
Forfeited restricted share awards (shares)		(148,083)
Forfeited restricted share awards	0	$ (1)	1
Repurchase of common stock (shares)		(440,286)
Repurchases of common stock	(4,069)	$ (4)	(4,065)
Stock-based compensation expense	3,592		3,592
Stockholder's equity, other activities, amount	$ (114)		(114)
Ending balance (shares) at Dec. 31, 2018	23,186,258	23,186,258
Ending balance at Dec. 31, 2018	$ 66,329	$ 232	$ 582,574	$ (515,456)	$ (1,021)