Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (8,658)	$ (6,825)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	5,675	4,244
Loss on disposal of assets	74
Deferred income taxes	(224)
Accretion of interest on notes payable		105
Non-cash interest expense on line of credit and term loan	67	4
Provision for doubtful accounts	95	331
Stock-based compensation	2,127	900
Increase (decrease) in operating assets and liabilities:
Accounts receivable	(391)	(1,098)
Prepaid expenses	(1,188)	(1,009)
Other assets	(1,743)	(734)
Accounts payable	251	1,043
Accrued payroll and employee related liabilities	1,558	472
Accrued expenses	305	(346)
Deferred revenue	8,605	6,953
Other liabilities	(18)	53
Net cash provided by operating activities	6,535	4,093
Cash flows from investing activities:
Capital expenditures	(739)	(2,330)
Additions to capitalized software development costs	(4,294)	(3,647)
Change in restricted cash		(77)
Net cash used in investing activities	(5,033)	(6,054)
Cash flows from financing activities:
Proceeds from line of credit	9,500	5,000
Payments on line of credit	(19,500)	(5,000)
Payments of issuance costs relating to line of credit and term loan	(19)	(59)
Principal payments on capital leases	(58)	(74)
Proceeds from initial public offering, net of underwriters discounts and commissions	69,750
Payments of initial public offering costs	(1,372)	(1,143)
Payments on notes payable	(2,018)
(Payments) proceeds from term loan	(5,000)	5,000
Proceeds from warrant exercises	25
Proceeds from option exercises	748	34
Repurchase of common stock		(1,500)
Net cash provided by financing activities	52,056	2,258
Effect of exchange rates on cash and cash equivalents	160	(29)
Net increase in cash and cash equivalents	53,718	268
Cash—beginning of year	8,578	4,412
Cash—end of year	62,296	4,680
Supplemental disclosures of cash flow information:
Interest	488	183
Taxes		124
Supplemental disclosure of non-cash activities
Capitalized assets included in accounts payable and accrued expenses	132	46
Deferred offering costs in accounts payable and accrued expenses	885	$ 1,366
Stock-based compensation capitalized for software development	$ 38