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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:    
Net (loss) income $ (71,798,000) $ 4,180,000
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation and amortization 1,401,000 848,000
Gain on sale of non-financial asset 0 (47,625,000)
Non-cash operating lease expense 1,383,000 807,000
Stock-based compensation 3,152,000 1,620,000
Accretion of premiums (discounts), net (1,410,000) 0
Deferred income tax (491,000) 491,000
Other 45,000 30,000
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (4,297,000) (136,000)
Accounts receivable (20,000) (151,000)
Other non-current assets (170,000) 165,000
Accounts payable 723,000 (653,000)
Accrued expenses and other current liabilities 3,564,000 2,471,000
Operating leases, net 448,000 (770,000)
Net cash used in operating activities (67,470,000) (38,723,000)
Cash flows from investing activities:    
Purchases of property and equipment (2,103,000) (2,878,000)
Proceeds from sale of non-financial asset 22,625,000 25,000,000
Purchases of marketable securities (213,390,000) 0
Maturities of marketable securities 32,270,000 0
Net cash (used in) provided by investing activities (160,598,000) 22,122,000
Cash flows from financing activities:    
Proceeds from Initial Public Offering, net of offering costs 302,788,000 0
Proceeds from issuance of Series B Convertible Preferred stock, net of issuance costs 74,942,000 74,521,000
Repurchases of unvested restricted common stock (1,000) (1,000)
Proceeds from exercise of stock options 52,000 0
Net cash provided by financing activities 377,781,000 74,520,000
Net increase in cash, cash equivalents and restricted cash 149,713,000 57,919,000
Cash, cash equivalents and restricted cash, beginning of year 89,388,000 31,469,000
Cash, cash equivalents and restricted cash, end of year 239,101,000 89,388,000
Supplemental cash flow information:    
Cash paid for income taxes 232,000 75,000
Supplemental disclosure for noncash investing and financing activities:    
Right-of-use asset recognized in exchange for operating lease liability 12,462,000 12,579,000
Other receivable related to sale of non-financial asset 0 22,625,000
Conversion of convertible preferred stock to common stock upon initial public offering 224,157,000 0
Unpaid offering costs included in accounts payable 21,000 0
Property and equipment included in accounts payable and accrued expenses and other current liabilities 37,000 262,000
Cash, Cash Equivalents and Restricted Cash:    
Cash and cash equivalents 238,196,000 88,483,000
Restricted Cash 905,000 905,000
Total cash, cash equivalents and restricted cash at end of year $ 239,101,000 $ 89,388,000