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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash flows from operating activities:    
Net (loss) income $ (48,879) $ (71,798)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,604 1,401
Gain on sale of non-financial asset (12,500) 0
Non-cash operating lease expense 2,103 1,383
Stock-based compensation 8,476 3,152
Accretion of discounts, net (3,448) (1,410)
Deferred income tax 0 (491)
Other 56 45
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (3,781) (4,297)
Accounts receivable (10,185) (20)
Other non-current assets (554) (170)
Accounts payable 6,603 723
Accrued expenses and other current liabilities 4,359 3,564
Increase (Decrease) in Contract with Customer, Liability 168,186 0
Operating leases, net (1,851) 448
Net cash used in operating activities 110,189 (67,470)
Cash flows from investing activities:    
Purchases of property and equipment (518) (2,103)
Proceeds from sale of non-financial asset 12,500 22,625
Purchases of available-for-sale marketable securities (450,950) (213,390)
Maturities of available-for-sale marketable securities 209,616 32,270
Net cash used in investing activities (229,352) (160,598)
Cash flows from financing activities:    
Proceeds from Initial Public Offering, net of offering costs 0 302,788
Proceeds from issuance of Series B Convertible Preferred stock, net of issuance costs 0 74,942
Repurchases of unvested restricted common stock (1) (1)
Proceeds from exercise of stock options 973 52
Proceeds from employee stock purchase plan 717 0
Net cash provided by financing activities 1,689 377,781
Net increase in cash, cash equivalents and restricted cash (117,474) 149,713
Cash, cash equivalents and restricted cash, beginning of year 239,101 89,388
Cash, cash equivalents and restricted cash, end of year 121,627 239,101
Supplemental cash flow information:    
Cash paid for income taxes 0 232
Supplemental disclosure for noncash investing and financing activities:    
Right-of-use asset recognized in exchange for operating lease liability 0 12,462
Conversion of convertible preferred stock to common stock upon initial public offering 0 224,157
Unpaid offering costs included in accounts payable 0 21
Property and equipment included in accounts payable and accrued expenses and other current liabilities 517 37
Cash, Cash Equivalents and Restricted Cash:    
Cash and cash equivalents 120,722 238,196
Restricted Cash 905 905
Total cash, cash equivalents and restricted cash at end of year $ 121,627 $ 239,101