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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net loss $ (29,166) $ (31,646)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation 2,520 3,877
Amortization of operating lease right-of-use assets 2,154 2,336
Depreciation 606 922
Amortization (accretion) of premiums (discounts) on securities, net (56) (980)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (953) 160
Accounts payable (104) (51)
Accrued expenses and other liabilities 376 390
Operating lease liabilities (2,203) (2,295)
Net cash used in operating activities (26,826) (27,287)
Cash flows from investing activities    
Proceeds from maturities of securities 55,715 45,878
Purchases of securities (28,496) (11,278)
Purchases of property and equipment (964) (615)
Net cash provided by investing activities 26,255 33,985
Cash flows from financing activities    
Proceeds from exercise of stock options 1,207 26
Proceeds from issuance of common stock under employee stock purchase plan 142 87
Net cash provided by financing activities 1,349 113
Net increase in cash, cash equivalents and restricted cash 778 6,811
Cash, cash equivalents and restricted cash at beginning of period 13,390 28,648
Cash, cash equivalents and restricted cash at end of period 14,168 35,459
Supplementary cash flow information on non-cash activities:    
Acquisitions of property and equipment included in accounts payable $ 355 $ 112