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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
OPERATING ACTIVITIES    
Net loss $ (80,605) $ (71,109)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 11,691 6,979
Depreciation expense 213 167
Loss on extinguishment of debt 0 250
Non-cash interest expense 163 1,030
Non-cash lease expense 125 3
(Gain) loss from changes in fair value of warrants 214 (73)
Loss on disposal of property and equipment 23 55
Accretion of net investment discounts (1,623)  
Changes in operating assets and liabilities:    
Accounts receivable (769) 0
Prepaid expenses and other current assets (1,713) (2,405)
Other Assets 24 (240)
Accounts payable 788 6
Accrued expenses and other current liabilities (3,412) 4,628
Deferred grant income 0 (3,313)
Deferred revenue (6,746) 12,500
Net cash used in operating activities (81,627) (51,522)
INVESTING ACTIVITIES    
Purchase of property and equipment (719) (366)
Purchases of marketable securities (154,747) 0
Maturities of marketable securities 60,250 0
Net cash used in investing activities (95,216) (366)
FINANCING ACTIVITIES    
Proceeds from Series D issuance 0 170,000
Issuance costs paid on Series D issuance 0 (542)
Proceeds from initial public offering, net of underwriting discounts and commissions 0 211,761
Issuance costs paid on initial public offering and private placement 0 (4,512)
Proceeds from issuance of common shares through private placement, net of placement agent fees 0 9,858
Proceeds from issuance of common stock through at-the-market facility, net of commissions 17,155 0
Issuance costs paid on at-the market offering (64) 0
Deferred offering costs paid (336) 0
Term loan principal payments (6,000) (6,000)
Proceeds from issuance of common shares upon stock option exercises 714 634
Net cash provided by financing activities 11,469 381,199
Effect of changes in exchange rate on cash and cash equivalents (87) 81
Net increase (decrease) in cash and cash equivalents (165,461) 329,392
Cash, cash equivalents and restricted cash at beginning of period 354,349 24,957
Cash and cash equivalents at end of period 188,888 354,349
Supplemental non-cash disclosure:    
Unpaid purchases of property and equipment 13 124
Conversion of convertible promissory notes into Series D-1 redeemable convertible preferred stock 0 40,651
Conversion of redeemable convertible preferred stock into common stock upon initial public offering 0 342,831
Cash paid for interest 611 1,420
Unpaid equity issuance costs included in accounts payable and accrued expenses 123 0
Right-of-use assets obtained in exchange for lease obligation $ 3,106 $ 282