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Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Revenue $ 0 $ 0 $ 0 $ 8
Operating expenses:        
Research and development 8 (713) 16 9,164
General and administrative 818 1,165 2,454 5,228
Restructuring and other charges 165 296 196 24,790
Total operating expenses 991 748 2,666 39,182
Loss from operations (991) (748) (2,666) (39,174)
Other income (expense):        
Interest and investment income 175 254 544 1,201
Change in fair value of purchase warrant liability (1,485) 376 (391) 15,334
Other income (expense) 0 1 0 (1)
Total other income (expense), net (1,310) 631 153 16,534
Loss before income taxes (2,301) (117) (2,513) (22,640)
Income tax expense 0 0 0 (5)
Net loss $ (2,301) $ (117) $ (2,513) $ (22,645)
Net loss per share - basic $ (0.19) $ (0.01) $ (0.2) $ (1.86)
Net loss per share - diluted $ (0.19) $ (0.01) $ (0.2) $ (1.86)
Weighted-average common shares - basic 12,319,212 12,223,922 12,307,453 12,186,830
Weighted-average common shares - diluted 12,319,212 12,223,922 12,307,453 12,186,830
Comprehensive income (loss):        
Net income (loss) $ (2,301) $ (117) $ (2,513) $ (22,645)
Net unrealized loss on marketable securities 0 0 0 (6)
Comprehensive loss $ (2,301) $ (117) $ (2,513) $ (22,651)