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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 $ (17,763) $ (30,202)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation 319 388
Stock-based compensation expense 2,855 3,432
Amortization and interest accretion related to operating lease 937 937
Amortization of premiums and accretion of discounts on marketable securities, net (822) (696)
Other non-cash adjustments 0 11
Changes in operating assets and liabilities:    
Prepaids and other current and non-current assets 538 304
Accounts payable (183) 943
Accrued expenses and other non-current liabilities (3,526) 2,711
Operating lease liabilities, current and non-current (781) (758)
Net cash used in operating activities (18,426) (22,930)
Cash flows from investing activities:    
Purchases of property and equipment 0 (125)
Purchases of marketable securities (28,459) (6,726)
Maturities of marketable securities 27,000 24,000
Net cash (used in) provided by investing activities (1,459) 17,149
Cash flows from financing activities:    
Issuance of common stock from At-the-Market Sales Agreement, net of underwriters' fees 1,511 0
Proceeds from employee equity plans 7 0
Net cash provided by financing activities 1,518 0
Effect of exchange rate changes on cash 3 (7)
Net decrease in cash, cash equivalents and restricted cash (18,364) (5,788)
Cash, cash equivalents and restricted cash at beginning of period 62,062 50,969
Cash, cash equivalents and restricted cash at end of period 43,698 45,181
Components of cash, cash equivalents and restricted cash    
Cash and cash equivalents 42,150 43,633
Restricted Cash 1,548 1,548
Total cash, cash equivalents and restricted cash at end of period 43,698 45,181
Supplemental noncash investing and financing activities    
Property and equipment included in accounts payable and accrued expenses 0 64
Cash paid for taxes $ 0 $ 86