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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Operating expenses        
Research and development $ 1,465,000 $ 1,834,000 $ 2,143,000 $ 4,297,000
General and administrative 1,956,000 2,775,000 3,877,000 6,053,000
Restructuring costs   968,000   968,000
Total operating expenses 3,421,000 5,577,000 6,020,000 11,318,000
Loss from operations (3,421,000) (5,577,000) (6,020,000) (11,318,000)
Other income, net        
Interest income, net 50,000 213,000 124,000 470,000
Foreign exchange transaction gain (loss), net (62,000) 68,000 (68,000) 75,000
Total other income, net (12,000) 281,000 56,000 545,000
Loss before income tax expense (3,433,000) (5,296,000) (5,964,000) (10,773,000)
Income tax expense (4,000) (42,000) (6,000) (42,000)
Net loss $ (3,437,000) $ (5,338,000) $ (5,970,000) $ (10,815,000)
Net loss per common share, basic $ (2.6) $ (4.92) $ (4.51) $ (9.97)
Net loss per common share, diluted $ (2.6) $ (4.92) $ (4.51) $ (9.97)
Weighted-average number of shares used in computing net loss per common share, basic 1,322,553 1,084,622 1,322,283 1,084,566
Weighted-average number of shares used in computing net loss per common share, diluted 1,322,553 1,084,622 1,322,283 1,084,566
Other comprehensive income (loss), net of tax        
Currency translation gain (loss) $ 509,000 $ (131,000) $ 712,000 $ (217,000)
Unrealized gain on marketable securities   2,000   34,000
Other comprehensive income (loss), net of tax 509,000 (129,000) 712,000 (183,000)
Total comprehensive loss $ (2,928,000) $ (5,467,000) $ (5,258,000) $ (10,998,000)