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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (10,815,000) $ (23,738,000)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation 10,000 35,000
Stock-based compensation 2,250,000 2,873,000
Issuance of common stock in connection with vesting of restricted stock units 5,000  
Amortization of premiums and discounts on marketable securities 70,000 (248,000)
Amortization of right of use lease asset 165,000 199,000
Accretion of lease liability 6,000 30,000
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 1,317,000 450,000
Other assets, noncurrent (857,000) (203,000)
Accounts payable (978,000) 2,207,000
Accrued expenses and other current liabilities (1,038,000) 1,639,000
Operating lease liabilities (171,000) (227,000)
Net cash used in operating activities (10,036,000) (16,983,000)
Cash flows from investing activities:    
Purchases of marketable securities   (21,994,000)
Proceeds from sale of marketable securities 11,650,000 26,459,000
Net cash provided by investing activities 11,650,000 4,465,000
Cash flows from financing activities:    
Proceed from issuance of common stock, net of issuance costs   2,705,000
Net cash provided by financing activities   2,705,000
Net increase (decrease) in cash and cash equivalents 1,614,000 (9,813,000)
Effect of exchange rate changes on cash and cash equivalents (217,000) (17,000)
Cash and cash equivalents, beginning of period 21,465,000 32,786,000
Cash and cash equivalents, end of period $ 22,862,000 22,956,000
Supplemental disclosures of noncash activities:    
Operating lease liabilities arising from obtaining right-of-use assets   $ 409,000