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Segments - Schedule of Consolidated Condensed Financial Statements of Operating Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Consolidated Condensed Financial Statements Of Operating Segment Abstract            
Government grant revenue $ 25 $ 25 $ 100 $ 45
Research personnel compensation costs, including stock-based compensation 320 385 658 818    
CRO and regulatory costs 15 36 186
Administrative personnel compensation costs, including stock-based compensation 401 350 736 712 1,592 1,434
Rent and office costs 118 80 318 162 279 365
Legal and accounting costs 110 179 649 592 1,223 2,287
Other expenses 54 [1] 7 [1] 66 [2] 41 [2] 120 [3] 202 [3]
Total segment expenses 1,003 1,001 2,427 2,340 4,600 6,115
Loss from operations (1,003) (976) (2,427) (2,315) (4,500) (6,070)
Loss on change in the fair value of related party Tasly convertible debt (57) (15) (118) (11) (311) (22)
Interest expense (1,289) (1,081) (2,519) (2,161) (4,424) (4,283)
Other income 1 1 6    
Total other expense, net (1,345) (1,095) (2,637) (2,166) (4,730) (4,211)
Net loss and comprehensive loss $ (2,348) $ (2,071) $ (5,064) $ (4,481) $ (9,230) $ (10,281)
[1] Other expenses includes small balances of research materials and supplies along with insurance costs.
[2] Other expenses includes small balances of research materials and supplies along with insurance costs.
[3] Other expenses includes small balances of research materials and supplies along with insurance costs.