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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities:    
Net loss $ (26,779) $ (16,482)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 6,553 2,094
Non-cash operating lease expense 489 491
Amortization of discount on marketable securities (200) (697)
Depreciation expense 154 159
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 740 (559)
Accounts payable 1,209 3,554
Accrued expenses and other current liabilities (3,463) (4,320)
Operating lease liabilities (543) (528)
Net cash used in operating activities (21,840) (16,288)
Cash flows from investing activities:    
Purchases of property and equipment 0 (86)
Purchases of marketable securities (25,327) (171,595)
Maturities of marketable securities 50,147 30,487
Net cash provided by (used in) investing activities 24,820 (141,194)
Cash flows from financing activities:    
Proceeds from initial public offering, net of underwriter discounts, commissions and offering costs paid during the period 0 202,389
Payment of deferred offering costs (320) 0
Exercise of common stock options 2,213 0
Net cash provided by financing activities 1,893 202,389
Net increase in cash, cash equivalents and restricted cash 4,873 44,907
Cash, cash equivalents and restricted cash at beginning of period 59,414 38,750
Cash, cash equivalents and restricted cash at end of period 64,287 83,657
Supplemental disclosure of non-cash investing and financing activities:    
Conversion of convertible preferred stock into common stock upon closing of initial public offering 0 330,368
Offering costs transferred to additional paid in capital 0 4,265
Deferred offering costs in accrued expenses and accounts payable 265 318
Proceeds receivable from stock option exercises 12 0
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 63,324 82,695
Restricted cash 963 962
Total cash, cash equivalents, and restricted cash $ 64,287 $ 83,657