Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 3,184	$ 905	$ (3,226)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	8,203	6,879	7,810
Amortization of deferred loan costs	85	60	20
Noncash interest expense	1,215	0	0
Stock-based compensation expense	7,052	5,123	3,926
Other loss from sale of assets	0	22	1,191
Foreign currency transaction (gains) losses on short-term intercompany balances	(2,190)	84	2,165
Deferred income taxes	731	(861)	(1,112)
Change in fair value of contingent consideration	(2,283)	0	0
Changes in operating assets and liabilities, net of business acquisitions:
Restricted cash	(4)	1	5
Billed receivables	(3,949)	(3,339)	4,331
Unbilled receivables	(469)	(509)	1,305
Prepaid expenses and other current assets	(417)	(1,506)	705
Other assets	(57)	(65)	0
Accounts payable and accrued expenses	815	1,218	(1,949)
Accrued payroll and related expenses	975	2,606	(3,595)
Refund liabilities	115	67	2,389
Deferred revenue	101	(5)	(784)
Other long-term liabilities	353	(562)	272
Net cash provided by operating activities	13,460	10,118	13,453
Cash flows from investing activities:
Business acquisition, net of cash acquired	(10,128)	(3,669)	(520)
Business divestiture	0	0	783
Purchases of property and equipment, net of disposal proceeds	(9,355)	(5,887)	(4,482)
Net cash used in investing activities	(19,483)	(9,556)	(4,219)
Cash flows from financing activities:
Repayments of long-term debt	66	0	0
Payments for deferred loan costs	(155)	0	(100)
Proceeds from term loan	10,000	3,600	0
Repurchases of common stock	0	(3,772)	(18,071)
Restricted stock repurchased from employees for withholding taxes	(100)	(218)	(312)
Proceeds from option exercises	1,172	326	91
Net cash provided by (used in) financing activities	10,983	(64)	(18,392)
Effect of exchange rates on cash and cash equivalents	(1,860)	103	(1,455)
Net increase (decrease) in cash and cash equivalents	3,100	601	(10,613)
Cash and cash equivalents at beginning of period	15,723	15,122	25,735
Cash and cash equivalents at end of period	18,823	15,723	15,122
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	434	60	63
Cash paid during the period for income taxes, net of refunds received	2,929	1,407	1,085
Noncash investing activities:
Fair value of contingent consideration liabilities at the date of acquisition	$ 5,954	$ 3,834	$ 0