Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 4,593	$ 3,184	$ 905
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	10,766	8,203	6,879
Amortization of deferred loan costs	53	85	60
Noncash interest expense	961	1,215	0
Stock-based compensation expense	5,056	7,052	5,123
Other loss from sale of assets	0	0	22
Foreign currency transaction losses (gains) on short-term intercompany balances	1,002	(2,190)	84
Income taxes	(1,321)	731	(861)
Changes in fair value of contingent consideration	(1,628)	(2,283)	0
Changes in operating assets and liabilities, net of business acquisitions:
Restricted cash	5	(4)	1
Billed receivables	(8,639)	(3,949)	(3,339)
Unbilled receivables	(992)	(469)	(509)
Prepaid expenses and other current assets	2,404	(417)	(1,506)
Other assets	(229)	(57)	(65)
Accounts payable and accrued expenses	(3,275)	815	1,218
Accrued payroll and related expenses	778	975	2,606
Refund liabilities	(2,112)	115	67
Deferred revenue	1,036	101	(5)
Compensation, Long-term Incentive, Payout	(6,378)	0	0
Other long-term liabilities	351	353	(562)
Net cash provided by operating activities	2,431	13,460	10,118
Cash flows from investing activities:
Business acquisition, net of cash acquired	19	(10,128)	(3,669)
Capital expenditures for property, equipment and software, net of disposal proceeds	(10,398)	(9,355)	(5,887)
Net cash used in investing activities	(10,379)	(19,483)	(9,556)
Cash flows from financing activities:
Repayments of long-term debt	(13,500)	66	0
Payment of deferred loan costs	(38)	(155)	0
Proceeds from credit facility	21,500	10,000	3,600
Business acquisitions, payment of earnout liability	(4,000)	0	0
Repurchases of common stock	(4,069)	0	(3,772)
Restricted stock repurchased from employees for withholding taxes	(1,281)	(100)	(218)
Proceeds from option exercises	4,422	1,172	326
Net cash provided by (used in) financing activities	3,034	10,983	(64)
Effect of exchange rates on cash and cash equivalents	64	(1,860)	103
Net (decrease) increase in cash and cash equivalents	(4,850)	3,100	601
Cash and cash equivalents at beginning of period	18,823	15,723	15,122
Cash and cash equivalents at end of period	13,973	18,823	15,723
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	681	434	60
Cash paid during the period for income taxes, net of refunds received	3,255	2,929	1,407
Noncash investing activities:
Fair value of contingent consideration liabilities at the date of acquisition	0	5,954	3,834
Capital expenditures incurred but not yet paid	$ 1,954	$ 365	$ 203