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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows used in operating activities:    
Net loss $ (6,495) $ (23,631)
Adjustments to reconcile net loss to net cash used in operating activities:    
Non-cash lease expense 76 95
Accretion on investment discounts (692) (500)
Stock-based compensation 2,864 1,694
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds (10,060) 13,336
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 724 (87)
Accounts payable, accrued expenses and other liabilities (2,403) 451
Operating lease liabilities (74) (99)
Net cash used in operating activities (16,060) (8,741)
Cash flows from investing activities:    
Purchase of available-for-sale short-term investments (31,850) (12,917)
Proceeds from maturities of available-for-sale short-term investments 35,742 22,700
Net cash provided by investing activities 3,892 9,783
Cash flows from financing activities:    
Proceeds from exercise of stock options 115  
Proceeds from issuances of common stock and pre-funded warrants, net   1
Net cash provided by financing activities 115 1
Net change in cash and cash equivalents (12,053) 1,043
Cash and cash equivalents at beginning of period 20,549 4,612
Cash and cash equivalents at end of period 8,496 $ 5,655
Noncash activities:    
Unrealized loss on available-for-sale securities, net $ (44)