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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net loss $ (37,006) $ (40,686)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 788 646
Stock-based compensation expense 4,395 7,718
Non-cash operating lease expense 549 503
Net amortization of premiums and accretion of discounts on investments 222 (533)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 329 1,169
Accounts payable (1,416) 264
Accrued expenses and other current liabilities (2,667) (4,844)
Operating lease liabilities (594) (382)
Net cash used in operating activities (35,400) (36,145)
Cash flows from investing activities:    
Purchases of investments (26,825) (35,284)
Proceeds from maturities of investments 55,000 74,500
Purchases of property and equipment (101) (551)
Net cash provided by investing activities 28,074 38,665
Cash flows from financing activities:    
Proceeds from issuance of common stock under at-the-market offering 7,299  
Proceeds from exercise of common stock options 8 1
Payments of issuance costs (4)  
Payments of tax withholdings related to vesting of restricted stock units (67) (441)
Net cash provided by (used in) financing activities 7,236 (440)
Net (decrease) increase in cash, cash equivalents, and restricted cash (90) 2,080
Cash, cash equivalents and restricted cash at beginning of period 41,702 40,016
Cash, cash equivalents and restricted cash at end of period 41,612 42,096
Supplemental disclosure of non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities 0 722
Issuance of common stock upon exercise of pre-funded warrants 7  
Reconciliation of cash, cash equivalents, and restricted cash:    
Cash and cash equivalents 41,417 41,895
Restricted cash 195 201
Total cash, cash equivalents, and restricted cash $ 41,612 $ 42,096