Condensed Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (8,284)	$ (13,144)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,399	3,658
Stock-based compensation expense	6,010	4,296
Other	(6)	384
Changes in operating assets and liabilities net of effects of acquisitions:
Accounts receivable	(100)	(1,673)
Prepaid expenses and other current assets	(1,124)	(541)
Other assets	51	11
Accounts payable	695	(73)
Accrued expenses and other liabilities	1,270	1,797
Deferred revenue	1,009	1,483
Deferred rent	247	86
Net cash provided by (used in) operating activities	4,167	(3,716)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(3,944)	(3,796)
Acquisition of business	(1,450)	0
Net cash used in investing activities	(5,394)	(3,796)
Proceeds from Issuance of Common Stock	134,528	0
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment on financing and capital lease obligations	1,510	1,679
Proceeds from exercise of equity awards	4,637	543
Payments Related to Tax Withholding for Share-based Compensation	(1,461)	0
Repayment on financing and capital lease obligations	(211)	(188)
Other	(33)	(33)
Net cash provided by financing activities	138,970	2,001
Effect of exchange rate changes on cash and cash equivalents	185	16
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	137,928	(5,495)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	85,864	93,405
CASH AND CASH EQUIVALENTS, END OF PERIOD	223,792	87,910
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	170	86
Cash paid for interest	621	650
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Earnout in business combination deemed part of total purchase consideration	5,142	0
Unpaid equipment purchases	783	2,537
Business Combination, Consideration Transferred, Indemnification Claims, Amount Held	750	$ 0
Deferred Offering Costs	$ 254