Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly financial data
Revenue, net	$ 34,957	$ 33,365	$ 36,995	$ 32,985	$ 40,233	$ 42,844	$ 41,692	$ 36,783	$ 138,302	$ 161,552	$ 178,268
Operating expenses:
Cost of revenue	22,384	23,507	24,111	23,167	27,876	27,966	28,596	26,452	93,169	110,890	112,853
Selling, general and administrative expenses	6,871	8,284	9,185	7,944	8,793	9,952	10,484	9,352	32,284	38,581	46,143
Depreciation of property and equipment	1,489	1,255	1,294	1,279	1,505	1,406	1,552	1,562	5,317	6,025	6,783
Amortization of intangible assets	441	517	754	746	831	895	902	903	2,458	3,531	4,997
Total operating expenses	31,185	33,563	35,344	33,136	39,005	40,219	41,534	38,269	133,228	159,027	173,549
Operating income from continuing operations	3,772	(198)	1,651	(151)	1,228	2,625	158	(1,486)	5,074	2,525	4,719
Foreign currency transaction (gains) losses on short-term intercompany balances	235	654	(416)	1,692	930	1,221	(163)	15	2,165	2,003	(13)
Interest expense (income), net	(87)	(8)	(53)	(42)	(44)	(44)	(43)	54	(190)	(77)	(77)
Other (income) loss	(421)	1,612	0	0	57	0	0	0	1,191	57	0
Income from continuing operations before income taxes	4,045	(2,456)	2,120	(1,801)	285	1,448	364	(1,555)	1,908	542	4,809
Income tax expense	(803)	421	296	455	2,388	554	186	113	369	3,241	2,755
Net income (loss) from continuing operations	$ 4,848	$ (2,877)	$ 1,824	$ (2,256)	$ (2,103)	$ 894	$ 178	$ (1,668)	$ (3,226)	$ (7,526)	$ (186)
Basic earnings (loss) per common share from continuing operations (usd per share)	$ 0.19	$ (0.11)	$ 0.07	$ (0.09)	$ (0.08)	$ 0.03	$ 0.01	$ (0.06)	$ (0.12)	$ (0.26)	$ (0.01)
Diluted earnings (loss) per common share from continuing operations (usd per share)	$ 0.19	$ (0.11)	$ 0.07	$ (0.09)	$ (0.08)	$ 0.03	$ 0.01	$ (0.06)	$ (0.12)	$ (0.26)	$ (0.01)