Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (6,202)	$ (3,225)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	2,933	1,793
Non-cash interest expense on line of credit and term loan		5
Provision for doubtful accounts and sales reserve	80	87
Stock-based compensation	955	657
Increase (decrease) in operating assets and liabilities:
Accounts receivable	4,277	1,417
Prepaid expenses	(1,071)	(815)
Other assets	338	(1,202)
Accounts payable	(4)	589
Accrued payroll and employee related liabilities	888	1,264
Accrued expenses	94	2
Deferred revenue	(816)	826
Other liabilities	(13)	(2)
Net cash provided by operating activities	1,459	1,396
Cash flows from investing activities:
Capital expenditures	(223)	(203)
Payments for acquisition of business, net of acquired cash	(21,235)
Additions to capitalized software development costs	(1,487)	(1,612)
Net cash used in investing activities	(22,945)	(1,815)
Cash flows from financing activities:
Proceeds from line of credit		7,000
Payments on line of credit		(7,000)
Principal payments on capital leases		(32)
Payments of public offering costs	(298)	(1,099)
Payments on notes payable		(2,018)
Proceeds from employee stock purchase plan	854
Proceeds from option exercises	12	58
Net cash provided by (used in) financing activities	568	(3,091)
Effect of exchange rates on cash and cash equivalents	(168)	27
Net decrease in cash and cash equivalents	(21,086)	(3,483)
Cash and cash equivalents—beginning of year	60,765	8,578
Cash and cash equivalents—end of year	39,679	5,095
Supplemental disclosures of cash flow information:
Interest		150
Taxes, net of refunds received	(3)
Supplemental disclosure of non-cash activities:
Capitalized assets included in accounts payable and accrued expenses	195	87
Deferred offering costs in accounts payable and accrued expenses	465	127
Stock-based compensation capitalized for software development	$ 13	$ 14