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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (201,285) $ (145,118)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 31,825 25,912
Non-cash interest expense 2,902 3,158
Change in fair value of derivative liabilities 3,066 1,103
Depreciation and amortization expense 3,076 2,835
Gain on disposal of items of property and equipment (29)  
Loss on extinguishment of debt   27,950
Changes in operating assets and liabilities:    
Accounts receivable, net 1,620 (4,056)
Prepaid expenses and other current assets 5,505 (5,357)
Inventory (448) (100)
Accounts payable 466 (430)
Operating lease assets 611 778
Accrued expenses 3,072 (568)
Deferred revenue (128) (200)
Operating lease liabilities (887) (1,155)
Net cash used in operating activities (150,634) (95,248)
Cash flows from investing activities:    
Purchases of property and equipment (9,171) (1,086)
Proceeds from sales of property and equipment 130  
Net cash used in investing activities (9,041) (1,086)
Cash flows from financing activities:    
Proceeds from exercise of stock options 17,607 10,752
Proceeds from issuance of common stock pursuant to employee stock purchase plan 713 492
Proceeds from issuance of common stock upon public offering, net of issuance costs 94,025  
Proceeds from issuance of common stock and pre-funded warrants upon private placement, net of issuance costs   316,353
Net cash provided by financing activities 112,345 327,597
Net (decrease) increase in cash, cash equivalents and restricted cash (47,330) 231,263
Cash, cash equivalents and restricted cash at beginning of period 393,716 197,571
Cash, cash equivalents and restricted cash at end of period 346,386 428,834
Supplemental disclosure of cash flow information:    
Cash paid for interest 6,785 18,198
Supplemental disclosure of non-cash investing and financing activities:    
Additions to property and equipment included in accounts payable and accrued expenses $ 1,739 $ 76