Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock [Member]
Beginning balance, shares at Dec. 31, 2013		29,367,439
Beginning balance at Dec. 31, 2013	$ 93,828	$ 294	$ 604,806	$ (513,386)	$ 2,114
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,526)			(7,526)
Foreign currency translation adjustments	(551)				(551)
Issuances of common stock:
Restricted share awards, shares		220,442
Restricted share awards	0	$ 2	(2)
Shares issued for acquisition, shares		187,620
Shares issued for acquisition	1,279	$ 2	1,277	0	0
Restricted shares remitted by employees for taxes, shares		(72,834)
Restricted shares remitted by employees for taxes	(568)	$ (1)	(567)
Stock option exercises, shares		716,780
Stock option exercises	2,823	$ 7	2,816
2006 MIP Performance Unit settlements, shares						16,526
2006 MIP Performance Unit settlements			(1)			$ 1
Forfeited restricted share awards, shares		(67,970)
Forfeited restricted share awards	0	$ (1)	1
Repurchases of common stock, shares		(3,605,142)
Repurchases of common stock	(22,685)	$ (36)	(22,649)	0	0
Stock-based compensation expense	4,386		4,386
Ending balance, shares at Dec. 31, 2014		26,762,861
Ending balance at Dec. 31, 2014	70,986	$ 268	590,067	(520,912)	1,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,226)			(3,226)
Foreign currency translation adjustments	(769)				(769)
Issuances of common stock:
Restricted share awards, shares		23,200
Restricted share awards	0	$ 0	0
Restricted shares remitted by employees for taxes, shares		(17,147)
Restricted shares remitted by employees for taxes	(312)	$ 0	(312)
Stock option exercises, shares		29,128
Stock option exercises	91	$ 0	91
2006 MIP Performance Unit settlements, shares		9,918
2006 MIP Performance Unit settlements	0	$ 0	0
Forfeited restricted share awards, shares		(7,918)
Forfeited restricted share awards	0	$ 0	0
Repurchases of common stock, shares		(4,118,386.000000)
Repurchases of common stock	(18,071)	$ (41)	(18,030)	0	0
Stock-based compensation expense	$ 3,716		3,716
Ending balance, shares at Dec. 31, 2015	22,681,656	22,681,656
Ending balance at Dec. 31, 2015	$ 52,415	$ 227	575,532	(524,138)	794
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	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)	$ 0	(217)
Stock option exercises, shares		90,496
Stock option exercises	320	$ 0	320
Repurchases of common stock, shares		(905,403)
Repurchases of common stock	(3,772)	$ (9)	(3,763)	0	0
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