Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (39,226)	$ (28,751)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	5,330	3,700
Amortization of debt discount		1,129
Non-cash interest expense	168	130
Stock-based compensation expense	13,337	2,833
Provision for doubtful accounts	504	576
Impairment of long-lived assets		483
Foreign currency re-measurement (gain) loss	(166)	90
Changes in assets and liabilities:
Accounts receivable	5,134	(6,649)
Prepaid expenses and other assets	(1,076)	(521)
Accounts payable	549	(1,601)
Accrued expenses	(1,607)	1,591
Deferred revenue	18,948	25,068
Other liabilities	166	(58)
Net cash provided by (used in) operating activities	2,061	(1,980)
Cash flows from investing activities:
Business acquisitions, net of cash acquired		(3,344)
Purchases of property and equipment	(3,307)	(2,839)
Net cash used in investing activities	(3,307)	(6,183)
Cash flows from financing activities:
Proceeds from initial public offering and concurrent private placement, net of offering costs of $2,456		112,916
Repayments of term loan and related termination fee		(18,540)
Payments of capital lease obligations	(68)	(187)
Taxes paid related to net share settlement of equity awards	(3,826)
Proceeds from employee stock purchase plan	3,724
Proceeds from stock option exercises	2,518	1,275
Net cash provided by financing activities	2,348	95,464
Effect of exchange rate changes on cash and cash equivalents	60	(140)
Net increase in cash and cash equivalents	1,162	87,161
Cash and cash equivalents, beginning of period	86,553	36,823
Cash and cash equivalents, end of period	87,715	123,984
Supplemental cash flow information:
Cash paid for income taxes	480	291
Cash paid for interest	$ 1	1,424
Supplemental non-cash investing and financing information:
Common stock issued for acquisitions		99
Initial public offering costs incurred but not yet paid		$ 641