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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Cash flows from operating activities      
Net loss $ (213,416) $ (116,003)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Loss on disposal of fixed assets 0 73  
Amortization of intangible assets 267 267  
Stock-based compensation expense 25,084 16,208  
Depreciation and amortization 1,692 1,540  
Change in fair value of warrant liabilities and contingent earn-out shares (2,439) (3,905)  
Net amortization of premium or discount on marketable securities (9,817) (15,244)  
Amortization of operating lease right-of-use asset 1,757 956  
Impairment of assets 0 2,761  
Changes in operating assets and liabilities:      
Accounts receivable 0 1,254  
Prepaid expenses and other current assets 6,426 (590)  
Accounts payable (8,270) (28,960)  
Accrued expenses and other current liabilities 1,549 (21,259)  
Operating lease liability (1,501) 85  
Other noncurrent assets 765 125  
Other noncurrent liabilities 3,468 2,132  
Net cash used in operating activities (194,435) (160,560)  
Cash flows from investing activities      
Purchases of marketable securities (510,036) (701,681)  
Maturities of marketable securities 497,353 456,882  
Purchases of property and equipment (3,266) (3,167)  
Net cash used in investing activities (15,949) (247,966)  
Cash flows from financing activities      
Proceeds from issuance of common stock under equity incentive plans 891 810  
Exercise of warrants 1 0  
Deferred offering costs (18) 0  
Net cash provided by financing activities 874 810  
Net decrease in cash, cash equivalents and restricted cash (209,510) (407,716)  
Cash, cash equivalents and restricted cash - beginning of period 546,762 699,179 $ 699,179
Cash, cash equivalents and restricted cash - end of period 337,252 291,463 546,762
Reconciliation of cash, cash equivalents and restricted cash to consolidated balance sheets      
Cash and cash equivalents 333,554 288,432 $ 543,064
Restricted cash 3,698 3,031  
Cash, cash equivalents and restricted cash - end of period 337,252 291,463  
Supplemental disclosure of non-cash investing and financing activities      
Purchases of property and equipment in accounts payable and accrued expenses and other current liabilities $ 2,785 $ 1,889