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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net loss $ (22,413) $ (19,940)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 2,642 2,312
Non-cash operating lease expense 363 345
Depreciation and amortization 124 113
Amortization of premium/discount on marketable securities (224) (426)
Realized gain on investments (1)  
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (259) (932)
Other non-current assets (51) (43)
Accounts payable 607 (455)
Accrued expenses and other current liabilities (4,429) (2,635)
Operating lease liabilities (252) (220)
Net cash provided (used) in operating activities (23,893) (21,881)
Cash flows from investing activities:    
Purchases of marketable securities (1,469)  
Proceeds from sales and maturities of marketable securities 24,981 16,466
Purchases of property and equipment (285)  
Net cash provided (used) by investing activities 23,227 16,466
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 13,267 5,184
Net cash provided by financing activities 13,267 5,184
Net change in cash and cash equivalents 12,601 (231)
Cash, cash equivalents and restricted cash at beginning of period 39,946 52,919
Cash, cash equivalents and restricted cash at end of period 52,547 $ 52,688
Supplemental disclosure of non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued expenses $ 41