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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss $ (5,970,000) $ (10,815,000)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation 11,000 10,000
Stock-based compensation 351,000 2,250,000
Issuance of common stock in connection with vesting of restricted stock units 29,000 5,000
Amortization of premiums and discounts on marketable securities   70,000
Amortization of right of use lease asset 6,000 165,000
Accretion of lease liability 3,000 6,000
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (155,000) 1,317,000
Other assets, noncurrent (376,000) (857,000)
Accounts payable 379,000 (978,000)
Accrued expenses and other current liabilities 1,051,000 (1,038,000)
Operating lease liabilities (10,000) (171,000)
Other liabilities, noncurrent 5,000  
Net cash used in operating activities (4,676,000) (10,036,000)
Cash flows from investing activities:    
Proceeds from sale of marketable securities   11,650,000
Net cash provided by investing activities   11,650,000
Cash flows from financing activities:    
Net increase (decrease) in cash and cash equivalents (4,676,000) 1,614,000
Effect of exchange rate changes on cash and cash equivalents 712,000 (217,000)
Cash and cash equivalents, beginning of period 14,175,000 21,465,000
Cash and cash equivalents, end of period 10,211,000 $ 22,862,000
Supplemental disclosures of cash flow information:    
Cash paid for taxes $ 5,000