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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities    
Net loss $ (174,250) $ (124,776)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 53,787 50,735
Amortization of premiums and accretion of discounts on investment securities (642) 1,766
Amortization of intangible assets 0 1,108
Loss (gain) on strategic investment (1,998) (706)
Depreciation 1,537 1,701
Changes in operating assets and liabilities:    
Accounts receivable, net 8,633 (12,449)
Interest and other receivables 575 1,063
Inventory 2,105 (4,427)
Prepaid expenses 899 1,072
Operating lease right-of-use assets 4,845 4,794
Other assets (48) 11
Accounts payable 3,132 (771)
Accrued liabilities 17,771 (17,260)
Operating lease liabilities (5,959) (4,044)
Long-term liabilities (568) (357)
Net cash used in operating activities (90,181) (102,540)
Cash flows from investing activities    
Purchases of investment securities (269,626) (453,847)
Maturities of investment securities 360,615 312,317
Purchases of property and equipment 0 (1,121)
Net cash provided by (used in) investing activities 90,989 (142,651)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of issuance costs 6,585 13,797
Net cash provided by financing activities 6,585 13,797
Effect of exchange rate changes on cash 14 6
Net increase (decrease) in cash, cash equivalents and restricted cash 7,407 (231,388)
Cash, cash equivalents and restricted cash    
Beginning of period 153,205 331,798
End of period $ 160,612 $ 100,410