Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly financial data
Revenue, net	$ 39,183	$ 35,137	$ 35,291	$ 31,233	$ 34,957	$ 33,365	$ 36,995	$ 32,985	$ 140,844	$ 138,302	$ 161,552
Operating expenses:
Cost of revenue	23,855	22,367	23,431	21,646	22,384	23,507	24,111	23,167	91,299	93,169	110,890
Selling, general and administrative expenses	11,048	9,883	9,620	8,848	6,871	8,284	9,185	7,944	39,399	32,284	38,581
Depreciation of property and equipment	1,209	1,376	1,216	1,232	1,489	1,255	1,294	1,279	5,033	5,317	6,025
Amortization of intangible assets	650	393	395	394	441	517	754	746	1,832	2,458	3,531
Total operating expenses	36,762	34,019	34,662	32,120	31,185	33,563	35,344	33,136	137,563	133,228	159,027
Operating income from continuing operations	2,421	1,118	629	(887)	3,772	(198)	1,651	(151)	3,281	5,074	2,525
Foreign currency transaction losses on short-term intercompany balances	1,060	(165)	196	(1,007)	235	654	(416)	1,692	84	2,165	2,003
Interest expense (income), net	(98)	(14)	(12)	(29)	(87)	(8)	(53)	(42)	(153)	(190)	(77)
Other (income) loss	19	(168)	18	10	(421)	1,612	0	0	(121)	1,191	57
Income from continuing operations before income taxes	1,440	1,465	427	139	4,045	(2,456)	2,120	(1,801)	3,471	1,908	542
Income tax expense (benefit)	1,263	(685)	460	204	(803)	421	296	455	1,242	369	3,241
Net income (loss) from continuing operations	$ 177	$ 2,150	$ (33)	$ (65)	$ 4,848	$ (2,877)	$ 1,824	$ (2,256)	$ 905	$ (3,226)	$ (7,526)
Basic earnings (loss) per common share from continuing operations (usd per share)	$ 0.01	$ 0.10	$ 0.00	$ 0.00	$ 0.19	$ (0.11)	$ 0.07	$ (0.09)	$ 0.04	$ (0.12)	$ (0.26)
Diluted earnings (loss) per common share from continuing operations (usd per share)	$ 0.01	$ 0.10	$ 0.00	$ 0.00	$ 0.19	$ 0.11	$ 0.07	$ (0.09)	$ 0.04	$ (0.12)	$ (0.26)