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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (43,068) $ (33,038)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 3,089 2,994
Stock-based compensation 20,692 5,423
Other (1,022) 664
Changes in operating assets and liabilities:    
Accounts receivable (658) 850
Prepaid expenses and other current assets 1,673 2,339
Deferred commissions (2,432) (629)
Other assets (1,209) 1,195
Accounts payable and accrued expenses 5,646 2,326
Accrued compensation (3,092) (2,620)
Deferred revenue 17,430 21,319
Other current liabilities (487) (30)
Other liabilities 441 (47)
Net cash (used in) provided by operating activities (2,997) 746
Cash flows from investing activities:    
Purchases of property and equipment (5,335) (2,978)
Purchases of short-term investments (102,453) 0
Sales and maturities of short-term investments 110,750 0
Net cash provided by (used in) investing activities 2,962 (2,978)
Cash flows from financing activities:    
Financing cash payments for finance leases (8) (252)
Payments of deferred offering costs 0 (1,515)
Proceeds from stock issued in connection with the employee stock purchase plan 8,579 0
Proceeds from the exercise of stock options 12,727 1,010
Repurchases of common stock 0 (75)
Net cash provided by (used in) financing activities 21,298 (832)
Effect of exchange rate changes on cash and cash equivalents and restricted cash (716) (491)
Net increase (decrease) in cash and cash equivalents and restricted cash 20,547 (3,555)
Cash and cash equivalents and restricted cash at beginning of period 165,378 27,472
Cash and cash equivalents and restricted cash at end of period 185,925 23,917
Supplemental disclosure of cash flow information:    
Cash paid for interest 49 56
Cash paid for income taxes 1,111 418
Supplemental cash flow information related to leases:    
Operating cash payments for operating leases 2,286 2,065
Operating cash payments for finance leases 3 20
Principal payments under finance lease obligations 8 252
Supplemental disclosure of non-cash investing and financing activities:    
Asset retirement obligations $ 250 $ 0