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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (71,961) $ (30,594)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 3,508 1,555
Share-based compensation 6,319 697
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 (1,826) (8,634)
Accounts receivable 273 (6,523)
Other assets and other current assets (601) (349)
Accounts payable 597 953
Accrued other expenses and other current liabilities 4,862 2,780
Deferred revenue (1,592) 1,296
Net cash used in operating activities (50,459) (38,811)
Cash flows from investing activities:    
Acquisition of license rights   (1,400)
Purchases of property, equipment and software (19,137) (4,407)
Proceeds from disposal of assets   15
Net cash used in investing activities (19,137) (5,792)
Cash flows from financing activities:    
Proceeds from stock option exercises 440 109
Issuance of Series B convertible preferred stock, net of issuance costs   109,741
Deferred offering costs (2,507) (481)
Issuance of convertible notes 39,550  
Proceeds from IPO, net of underwriting discounts and commissions 135,185  
Net cash provided by financing activities 172,668 109,369
Net increase in cash and cash equivalents 103,072 64,766
Cash and cash equivalents—beginning of period 103,193 62,802
Cash and cash equivalents —end of period 206,265 127,568
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 $ 3,524 2,187
Deferred offering costs included in accounts payable, accrued expenses and other current liabilities   $ 857