Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue, net of refund liabilities	$ 171,776	$ 161,620	$ 140,844
Operating expenses:
Cost of revenue	104,825	102,052	91,299
Selling, general and administrative expenses	50,456	46,941	39,399
Depreciation of property, equipment and software assets	7,370	4,569	5,033
Amortization of intangible assets	3,395	3,634	1,832
Acquisition-related adjustments (income) loss	(1,628)	(2,283)	0
Total operating expenses	164,418	154,913	137,563
Operating income from continuing operations	7,358	6,707	3,281
Foreign currency transaction losses (gains) on short-term intercompany balances	1,002	(2,190)	84
Interest expense	(1,824)	(1,785)	(107)
Interest income	161	246	260
Other loss (income)	21	(160)	(121)
Net income from continuing operations before income tax	4,672	7,518	3,471
Income tax expense	1,321	2,962	1,242
Net income from continuing operations	3,351	4,556	2,229
Discontinued operations:
Income (loss) from discontinued operations	1,242	(1,372)	(1,324)
Income tax expense (benefit)	0	0	0
Net income (loss) from discontinued operations	1,242	(1,372)	(1,324)
Net income from continuing operations	$ 4,593	$ 3,184	$ 905
Basic earnings (loss) per common share (Note 3):
Basic earnings from continuing operations (in USD per share)	$ 0.14	$ 0.21	$ 0.10
Basic earnings from discontinued operations (in USD per share)	0.06	(0.06)	(0.06)
Total basic earnings (loss) per common share (in USD per share)	0.20	0.15	0.04
Diluted earnings (loss) per common share (Note 3):
Diluted earnings from continuing operations (in USD per share)	0.14	0.21	0.10
Diluted earnings from discontinued operations (in USD per share)	0.06	(0.06)	(0.06)
Total diluted earnings (loss) per common share (in USD per share)	$ 0.20	$ 0.15	$ 0.04
Weighted-average common shares outstanding (Note 3):
Basic (shares)	22,811	21,937	21,969
Diluted (shares)	23,434	22,111	22,016