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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 $ (198,003) $ (48,027)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 5,797 5,155
Stock-based compensation 12,027 9,705
Change in fair value of earn-out liabilities (2,518) (514)
Change in fair value of derivative warrant liabilities 149,250 (717)
Accretion of available-for-sale securities (7,025) (2,752)
Amortization of debt issuance costs, commitment fees and accretion of final payment fees   741
Non-cash lease expense 1,175 1,533
Changes in operating assets and liabilities:    
Accounts receivable 150 (1,355)
Prepaid expenses, other current assets and other assets (1,846) (1,955)
Deferred revenue (113) 543
Accounts payable 569 (808)
Accrued expenses and operating lease liabilities (3,105) (3,632)
Net cash used in operating activities (43,642) (42,083)
Cash flows from investing activities:    
Purchases of property and equipment (14,103) (9,816)
Purchases of available-for-sale securities (522,605) (98,451)
Maturities of available-for-sale securities 147,000 107,499
Net cash used in investing activities (389,708) (768)
Cash flows from financing activities:    
Payments of principal of notes payable   (9,491)
Proceeds from sale of common stock through Common Stock Purchase Agreement   12,838
Proceeds from sale of common stock through At-The-Market (ATM) Offerings 346,719 38,831
Proceeds from sale of common stock from Quanta private placement transaction 35,000  
Payments of offering costs (888) (476)
Net proceeds from tax withholdings on sell-to-cover equity award transactions 6,272  
Proceeds from issuance of common stock upon exercise of stock options 1,809 83
Proceeds from issuance of common stock upon exercise of warrants 3,000  
Net cash provided by financing activities 391,912 41,785
Effects of exchange rate changes on cash and cash equivalents (103) (40)
Net decrease in cash and cash equivalents (41,541) (1,106)
Cash and cash equivalents - beginning of period 67,674 21,392
Cash and cash equivalents - end of period 26,133 20,286
Supplemental disclosures of other cash flow information:    
Cash paid for interest   2,057
Non-cash investing and financing activities:    
Capitalization of deferred costs to equity upon share issuance   190
Purchases of property and equipment recorded in accounts payable 1,586 252
Purchases of property and equipment recorded in accrued expenses 184 76
Non-cash addition to operating lease right-of-use asset and liability   2,268
Reclassification of earn-out liabilities to additional paid-in capital for vesting of Promote Sponsor Vesting Shares 43,379  
Reclassification of derivative liabilities to additional paid-in capital due to exercise of Public Warrants 1,609  
Unrealized gain on short term investments $ 687 $ 54