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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities:    
Net loss $ (19,857) $ (24,063)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 227 244
Non-cash loss on sale of property and equipment 153 0
Net (accretion) and amortization of investments in marketable securities (364) (436)
Non-cash lease expense 582 411
Stock-based compensation expense 6,963 4,040
Changes in operating assets and liabilities:    
Accounts receivable (58) 0
Prepaid expenses and other current assets 814 (825)
Other assets 346 (51)
Accounts payable 2,305 185
Accrued expenses and other current liabilities (3,491) 331
Operating lease liabilities (681) (73)
Net cash used in operating activities (13,061) (20,237)
Cash flows from investing activities    
Purchases of short-term investments (30,370) (43,235)
Sale of short-term investments 10,075 0
Maturities of short-term investments 58,322 64,557
Purchases of property and equipment (86) (291)
Net cash provided by investing activities 37,941 21,031
Cash flows from financing activities    
Payment of deferred offering costs (273) 0
Proceeds from exercise of stock options 809 6
Repurchase of unvested restricted common stock (5) (1)
Net cash provided by financing activities 531 5
Net increase in cash, cash equivalents, and restricted cash 25,411 799
Cash, cash equivalents, and restricted cash at beginning of period 52,750 56,910
Cash, cash equivalents, and restricted cash at end of period 78,161 57,709
Supplemental disclosure for noncash investing and financing activities:    
Right-of-use assets obtained in exchange for operating lease liabilities 0 6,439
Deferred offering costs included in accounts payable and accrued expenses at period end 180 0
Purchases of property and equipment included in accounts payable and accrued expenses at period end 49 0
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 78,056 57,604
Restricted cash 105 105
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 78,161 $ 57,709