Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (19,039)	$ (26,338)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,671	4,657
Stock-based compensation expense	6,606	5,250
Change in fair value of preferred stock warrant	0	25
Other	820	343
Changes in operating assets and liabilities net of effects of acquisitions:
Accounts receivable	(2,229)	(3,498)
Prepaid expenses and other current assets	(605)	6
Other assets	(67)	138
Accounts payable	(52)	626
Accrued expenses and other liabilities	2,635	2,898
Deferred revenue	2,031	1,804
Deferred rent	105	220
Net cash used in operating activities	(4,124)	(13,869)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(6,466)	(7,989)
Change in restricted cash and deposits	0	788
Acquisition of business	(4,138)	(3,000)
Net cash used in investing activities	(10,604)	(10,201)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of equity awards	4,884	67
Proceeds from employee stock purchase plan	3,040	0
Repayment on financing and capital lease obligations	(287)	(144)
Proceeds from initial public offering	0	93,093
Payments of deferred offering cost	0	(3,262)
Other	(33)	(73)
Net cash provided by financing activities	7,604	89,681
Effect of exchange rate changes on cash and cash equivalents	7	(176)
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	(7,117)	65,435
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	93,405	34,675
CASH AND CASH EQUIVALENTS, END OF PERIOD	86,288	100,110
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	186	66
Cash paid for interest	980	604
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Accretion of redeemable convertible preferred stock to redemption value	0	9,862
Deemed dividend—preferred stock modification	0	1,748
Conversion of preferred stock warrants to common stock warrants	0	1,213
Unpaid equipment purchases	1,592	963
Property and equipment acquired with financing obligations and leases	0	844
Stock issued in business acquisition	500	1,500
Unpaid acquisition consideration held back to satisfy potential indemnification claims	750	0
Unpaid offering costs	$ 0	$ 118