Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly financial data
Revenue	$ 41,322	$ 42,988	$ 41,981	$ 37,901	$ 46,507	$ 53,403	$ 50,205	$ 45,101	$ 164,192	$ 195,216	$ 208,503
Operating expenses:
Cost of revenue	28,502	28,681	29,944	28,832	30,239	31,803	32,522	31,538	115,959	126,102	137,351
Selling, general and administrative expenses	9,283	10,492	11,037	9,976	13,974	13,017	11,629	10,580	40,788	49,200	49,566
Depreciation of property and equipment	1,520	1,428	1,586	1,682	2,162	2,034	2,027	2,008	6,216	8,231	7,084
Amortization of intangible assets	831	895	902	903	1,185	1,204	1,332	1,276	3,531	4,997	7,224
Impairment charges	0	0	0	0	4,207	0	0	0	0	4,207	0
Total operating expenses	40,136	41,496	43,469	41,393	51,767	48,058	47,510	45,402	166,494	192,737	201,225
Operating income (loss)	1,186	1,492	(1,488)	(3,492)	(5,260)	5,345	2,695	(301)	(2,302)	2,479	7,278
Foreign currency transaction (gains) losses on short-term intercompany balances	930	1,221	(163)	15	41	(636)	225	357	2,003	(13)	(377)
Interest expense (income), net	(44)	(44)	(43)	54	12	75	53	(217)	(77)	(77)	966
Other income (loss)	57	0	0	0	0	0	0	0	(57)	0	0
Income (loss) before income taxes	243	315	(1,282)	(3,561)	(5,313)	5,906	2,417	(441)	(4,285)	2,569	6,689
Income tax expense	2,388	554	186	113	1,084	1,029	586	56	3,241	2,755	1,297
Net income (loss)	$ (2,145)	$ (239)	$ (1,468)	$ (3,674)	$ (6,397)	$ 4,877	$ 1,831	$ (497)	$ (7,526)	$ (186)	$ 5,392
Basic earnings (loss) per common share (usd per share)	$ (0.08)	$ (0.01)	$ (0.05)	$ (0.12)	$ (0.22)	$ 0.17	$ 0.06	$ (0.02)	$ (0.26)	$ (0.01)	$ 0.21
Diluted earnings (loss) per common share (usd per share)	$ (0.08)	$ (0.01)	$ (0.05)	$ (0.12)	$ (0.22)	$ 0.16	$ 0.06	$ (0.02)	$ (0.26)	$ (0.01)	$ 0.21