Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net loss	$ (13,513)	$ (13,664)	$ (20,117)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	9,794	8,451	7,457
Deferred income taxes	529	207	(295)
Foreign currency re-measurement (gain) loss	(64)	981	0
Non-cash interest and other expense	327	376	589
Non-cash stock compensation expense	4,333	2,741	1,077
Stock-based compensation—related party vendor	0	0	11,220
Loss on disposal of business	746	0	0
Non-cash loss on retirement of fixed assets	276	0	0
Changes in operating assets and liabilities, net of purchase business combinations:
Accounts receivable	(361)	741	(1,579)
Prepaids and other	(648)	(1,873)	(484)
Accounts payable	(1,453)	157	639
Accrued expenses and other liabilities	413	(2,796)	(924)
Deferred revenue	2,200	(570)	2,626
Net cash provided by (used in) operating activities	3,875	(1,503)	1,177
Investing activities
Purchase of property and equipment	(670)	(956)	(861)
Purchase of customer relationships	(408)	(791)	0
Purchase business combinations, net of cash acquired	(12,151)	(7,664)	(6,217)
Net cash used in investing activities	(13,229)	(9,411)	(7,078)
Financing activities
Payments on capital leases	(1,683)	(1,020)	(541)
Proceeds from notes payable, net of issuance costs	30,992	24,083	5,685
Payments on notes payable	(7,190)	(23,907)	(10,910)
Issuance of preferred stock, net of issuance costs	0	0	(97)
Issuance of common stock, net of issuance costs	(515)	(18)	38,846
Additional consideration paid to sellers of businesses	(2,079)	(359)	(599)
Net cash provided by (used in) financing activities	19,525	(1,221)	32,384
Effect of exchange rate fluctuations on cash	114	(380)	(198)
Change in cash and cash equivalents	10,285	(12,515)	26,285
Cash and cash equivalents, beginning of period	18,473	30,988	4,703
Cash and cash equivalents, end of period	28,758	18,473	30,988
Supplemental disclosures of cash flow information:
Cash paid for interest	2,455	1,523	1,382
Cash paid for taxes	488	314	252
Noncash investing and financing activities:
Equipment acquired pursuant to capital lease obligations	1,293	3,428	1,572
Issuance of common stock in business combination	$ 8,300	$ 1,386	$ 6,146