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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows used in operating activities:    
Net loss $ (10,295) $ (10,772)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of operating lease asset 95 92
Accretion on investment discounts (500)  
Stock-based compensation 1,694 1,381
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (87) 471
Accounts payable, accrued expenses and other liabilities 451 (1,018)
Operating lease liabilities (99) (78)
Net cash used in operating activities (8,741) (9,924)
Cash flows from investing activities:    
Purchase of available-for-sale short-term investments (12,917)  
Proceeds from maturities of available-for-sale short-term investments 22,700  
Net cash provided by investing activities 9,783  
Cash flows from financing activities:    
Proceeds from issuances of common stock and pre-funded warrants, net 1  
Net cash provided by financing activities 1  
Net change in cash and cash equivalents 1,043 (9,924)
Cash and cash equivalents at beginning of period 4,612 56,409
Cash and cash equivalents at end of period $ 5,655 $ 46,485