Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (9,639)	$ (6,029)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	5,228	3,701
Loss on disposal of assets		74
Deferred income taxes	41	(224)
Non-cash interest expense on line of credit and term loan		10
Non-cash investment income	(8)
Provision for doubtful accounts and sales reserve	369	87
Stock-based compensation	2,044	1,378
Increase (decrease) in operating assets and liabilities:
Accounts receivable	(2,973)	(1,601)
Prepaid expenses	(1,044)	(756)
Other assets	29	(1,214)
Accounts payable	(430)	(66)
Accrued payroll and employee related liabilities	500	263
Accrued expenses	293	(373)
Deferred revenue	2,868	3,053
Other liabilities	363	6
Net cash used in operating activities	(2,359)	(1,691)
Cash flows from investing activities:
Capital expenditures	(505)	(346)
Proceeds from sale leaseback transaction	395
Payments for acquisition of business, net of acquired cash	(21,235)
Change in restricted cash	(294)
Purchase of short-term investments	(12,427)
Additions to capitalized software development costs	(3,044)	(3,040)
Net cash used in investing activities	(37,110)	(3,386)
Cash flows from financing activities:
Proceeds from line of credit		9,500
Payments on line of credit		(9,000)
Principal payments on capital leases		(58)
Proceeds from follow-on offering, net of underwriters discount and commissions	10,444
Payments of public offering costs	(729)	(1,101)
Payments on notes payable		(2,018)
Proceeds from employee stock purchase plan	854
Proceeds from option exercises	1,115	185
Net cash provided by (used in) financing activities	11,684	(2,492)
Effect of exchange rates on cash and cash equivalents	(147)	39
Net decrease in cash and cash equivalents	(27,932)	(7,530)
Cash and cash equivalents—beginning of period	60,765	8,578
Cash and cash equivalents—end of period	32,833	1,048
Supplemental disclosures of cash flow information:
Interest		315
Taxes, net of refunds received	3
Supplemental disclosure of non-cash activities:
Capitalized assets included in accounts payable and accrued expenses	1,335	107
Deferred offering costs in accounts payable and accrued expenses	143	126
Stock-based compensation capitalized for software development	$ 25	$ 28