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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities:    
Net loss $ (61,310) $ (14,514)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 6,502 2,180
Stock-based compensation expense 20,573 4,384
Loss on disposal of property and equipment 1 614
Loss on extinguishment of debt 1,521 0
Accretion of discount on term loan 17 46
Amortization of right-of-use assets 2,226 0
Changes in operating assets and liabilities:    
Accounts receivable 10,646 1,360
Inventory (6,488) (3,755)
Prepaid expenses and other current assets (1,706) (7,642)
Other assets (2,966) (73)
Accounts payable (2,810) (986)
Accrued compensation and other related benefits (2,097) (645)
Deferred revenue 492 390
Accrued contingent liabilities 6,518 17,255
Accrued expenses and other current liabilities 3,100 2,978
Deferred rent, noncurrent 0 11,690
Operating lease liability (1,986) 0
Other noncurrent liabilities (4,327) 119
Net cash (used in) provided by operating activities (32,094) 13,401
Investing activities:    
Purchases of property and equipment (14,818) (22,508)
Net cash used in investing activities (14,818) (22,508)
Financing activities:    
Payments on financing arrangement (5,846) 0
Payments on term loans (31,256) 0
Deferred offering costs 0 (1,946)
Issuance of common stock from exercise of stock options and employee stock purchase plan purchases 11,334 2,005
Net cash (used in) provided by financing activities (25,768) 59
Effect of exchange rates on changes in cash, cash equivalents, and restricted cash (123) 2
Net decrease in cash, cash equivalents, and restricted cash (72,803) (9,046)
Cash, cash equivalents, and restricted cash at beginning of period 476,493 70,088
Cash, cash equivalents, and restricted cash at end of period 403,690 61,042
Supplemental disclosures of cash flow information:    
Cash paid for interest 1,670 1,134
Cash paid for taxes 160 22
Noncash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities 2,454 9,679
Right-of-use assets obtained in exchange for new operating lease liabilities 7,558 0
Deferred offering costs in accounts payable and accrued expenses and other current liabilities 0 1,142
Debt discount in accrued expenses and other current liabilities $ 0 $ 58