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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 $ (28,666) $ (34,127)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 693 678
Accretion of marketable securities   (1,277)
Non-cash interest expense related to note payable 120 110
Stock-based compensation 2,465 3,414
Changes in current assets and liabilities:    
Prepaid expenses and other assets 126 (524)
Right-of-use assets and lease liabilities, net 16 1,167
Accounts payable 1,045 558
Accrued expense and other liabilities 904 (5,414)
Deferred revenue (982) (2,171)
Net cash used in operating activities (24,279) (37,586)
Cash flows from investing activities:    
Purchases of property and equipment (70) (1,532)
Purchases of marketable securities   (60,938)
Maturities of marketable securities   76,000
Net cash provided by (used in) investing activities (70) 13,530
Cash flows from financing activities:    
Cash paid for debt issuance costs   (400)
Cash paid for financing costs   (125)
Net cash used in financing activities   (525)
Net (decrease) increase in cash, cash equivalents and restricted cash (24,349) (24,581)
Cash, cash equivalents, and restricted cash - beginning of period 157,437 183,720
Cash, cash equivalents, and restricted cash - end of period 133,088 159,139
Summary of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets:    
Cash and cash equivalents 128,057 154,108
Restricted cash 5,031 5,031
Total cash, cash equivalents, and restricted cash 133,088 159,139
Supplemental disclosure of cash flow information:    
Cash paid for interest 569 569
Supplemental disclosure of non-cash investing and financing activities:    
Financing costs not yet paid   75
Purchase of property and equipment in accounts payable and accrued liabilities $ 44 $ 339