Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net loss	$ (18,725)	$ (13,513)	$ (13,664)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	11,914	9,794	8,451
Deferred income taxes	(262)	529	207
Foreign currency re-measurement (gain) loss	(382)	(64)	981
Non-cash interest and other expense	592	327	376
Non-cash stock compensation expense	9,977	4,333	2,741
Loss on disposal of business	0	746	0
Non-cash loss on retirement of fixed assets	(19)	276	0
Changes in operating assets and liabilities, net of purchase business combinations:
Accounts receivable	(4,710)	(361)	741
Prepaids and other	1,555	648	1,873
Accounts payable	1,254	(1,453)	157
Accrued expenses and other liabilities	3,715	413	(2,796)
Deferred revenue	2,807	2,200	(570)
Net cash provided by (used in) operating activities	7,716	3,875	(1,503)
Investing activities
Purchase of property and equipment	(396)	(670)	(956)
Purchase of customer relationships	(55)	(408)	(791)
Purchase business combinations, net of cash acquired	(110,324)	(12,151)	(7,664)
Net cash used in investing activities	(110,775)	(13,229)	(9,411)
Financing activities
Payments on capital leases	(1,497)	(1,683)	(1,020)
Proceeds from notes payable, net of issuance costs	74,538	30,992	24,083
Payments on notes payable	(11,912)	(7,190)	(23,907)
Taxes paid related to net share settlement of equity awards	(3,387)	(726)	0
Issuance of common stock, net of issuance costs	43,797	211	(18)
Additional consideration paid to sellers of businesses	(5,361)	(2,079)	(359)
Net cash provided by (used in) financing activities	96,178	19,525	(1,221)
Effect of exchange rate fluctuations on cash	449	114	(380)
Change in cash and cash equivalents	(6,432)	10,285	(12,515)
Cash and cash equivalents, beginning of period	28,758	18,473	30,988
Cash and cash equivalents, end of period	22,326	28,758	18,473
Supplemental disclosures of cash flow information:
Cash paid for interest	6,012	2,455	1,523
Cash paid for taxes	1,782	488	314
Noncash investing and financing activities:
Equipment acquired pursuant to capital lease obligations	50	1,293	3,428
Issuance of common stock in business combination	$ 0	$ 8,300	$ 1,386