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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (53,907) $ (29,353)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 4,580 3,316
Stock-based compensation 14,206 5,503
Deferred income taxes 0 486
Other 771 23
Changes in operating assets and liabilities:    
Accounts receivable (8,190) (8,435)
Prepaid expenses and other current assets 1,228 (540)
Deferred commissions (2,708) (11,275)
Other assets 564 (1,537)
Accounts payable and accrued expenses 1,930 2,485
Accrued compensation 1,252 (715)
Deferred revenue 39,880 40,066
Other current liabilities 36 (840)
Other liabilities (647) 2
Net cash used in operating activities (1,005) (814)
Cash flows from investing activities:    
Purchases of property and equipment (4,140) (1,628)
Purchases of short-term investments (34,114) 0
Net cash used in investing activities (38,254) (1,628)
Cash flows from financing activities:    
Proceeds from initial public offering, net of underwriting discounts and commissions 268,531 0
Payments of costs related to initial public offering (3,732) 0
Principal payments under capital lease obligations (389) (173)
Credit facility issuance costs 0 (238)
Proceeds from the exercise of stock options 1,415 2,847
Repurchases of common stock (75) (385)
Net cash provided by financing activities 265,750 2,051
Effect of exchange rate changes on cash and cash equivalents and restricted cash (675) 22
Net increase (decrease) in cash and cash equivalents and restricted cash 225,816 (369)
Cash and cash equivalents and restricted cash at beginning of period 27,472 34,470
Cash and cash equivalents and restricted cash at end of period 253,288 34,101
Supplemental disclosure of cash flow information:    
Cash paid for interest 85 46
Cash paid for income taxes 920 510
Supplemental disclosure of non-cash investing and financing activities:    
Assets acquired under capital leases 4 826
Asset retirement obligations 67 764
Construction in progress $ 21,294 $ 0