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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (51,219) $ (20,838)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,107 970
Share-based compensation 3,828 405
Loss on disposal of assets 22 8
Non-cash interest expense 182  
Change in fair value of convertible notes payable 9,758  
Changes in operating assets and liabilities:    
Prepaid expenses 648 (3,190)
Accounts receivable 273  
Other assets (852) (30)
Accounts payable 207 234
Accrued expenses 2,436 1,306
Deferred revenue (3,872) (2,629)
Net cash used in operating activities (36,482) (23,764)
Cash flows from investing activities:    
Purchases of property, equipment and software (13,219) (1,747)
Net cash used in investing activities (13,219) (1,747)
Cash flows from financing activities:    
Proceeds from stock option exercises 379 82
Issuance of Series B convertible preferred stock, net of issuance costs   88,020
Deferred offering costs (2,507) (50)
Issuance of convertible notes 39,550  
Proceeds from IPO, net of underwriting discounts and commissions 135,185  
Net cash provided by financing activities 172,607 88,052
Net increase in cash and cash equivalents 122,906 62,541
Cash and cash equivalents—beginning of period 103,193 62,802
Cash and cash equivalents —end of period 226,099 125,343
Supplemental disclosures of noncash financing and investing activities:    
Common stock issued on conversion of convertible notes 49,490  
Property, equipment and software additions included in accounts payable, accrued expenses and other current liabilities $ 2,052 1,088
Series B convertible preferred stock offering costs included in accounts payable, accrued expenses and other current liabilities   194
Deferred offering costs included in accounts payable, accrued expenses and other current liabilities   $ 31