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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities    
Net Income (Loss) $ (132,102) $ (200,975)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 14,084 13,572
Stock-based compensation 51,594 65,727
Net amortization (accretion) of premium (discount) on marketable securities 0 (846)
Settlement of derivative contracts 355 (314)
Amortization of operating lease right-of-use asset 5,940 5,711
Amortization of issuance costs 0 4
Changes in assets and liabilities:    
Prepaid expenses and other current assets (827) 6,994
Other assets (24) 410
Accounts payable (10,330) 3,114
Accrued and other current liabilities (7,779) (8,263)
Operating lease liability (8,160) (7,078)
Net cash provided by (used in) operating activities (87,249) (121,944)
Cash flows from investing activities    
Purchase of property and equipment (251) (13,866)
Deposits on property and equipment (25) (77)
Purchase of marketable securities 0 (49,347)
Maturities of marketable securities 0 340,000
Settlement of derivative contracts (355) 314
Net cash provided by (used in) investing activities (631) 277,024
Cash flows from financing activities    
Proceeds from issuance of common stock upon options exercise 38 60
Proceeds from issuance of common stock pursuant to employee stock purchase plans 59 131
Principal payments of tenant improvement allowance payable 0 (36)
Net cash provided by (used in) financing activities 97 155
Net increase (decrease) in cash, cash equivalents and restricted cash (87,783) 155,235
Cash, cash equivalents and restricted cash, at beginning of period 291,831 196,757
Cash, cash equivalents and restricted cash, at end of period 204,048 351,992
Reconciliation of cash, cash equivalents and restricted cash to consolidated balance sheets    
Cash and cash equivalents 197,864 345,668
Restricted cash 6,184 6,324
Total cash, cash equivalents and restricted cash in consolidated balance sheets 204,048 351,992
Supplemental disclosures of non-cash investing and financing information:    
Operating lease right-of-use asset obtained in exchange for operating lease liability (49) 2,668
Purchase of property and equipment under accounts payable and accruals $ 14 $ 27,465