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Segments - Schedule of Other Financial Information Regarding The Company’s 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 Other Financial Information Regarding The Company SOperating Segment Abstract            
Government grant revenue $ 25 $ 25 $ 100 $ 45
Operating expenses:            
Research personnel compensation costs, including stock-based compensation         1,350 1,641
CRO and regulatory costs         36 186
Administrative personnel compensation costs, including stock-based compensation         1,592 1,434
Rent and office costs         279 365
Legal and accounting costs         1,223 2,287
Other expenses         120 202
Total operating 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 (including related parties amounts of $2,400 and $2,530 for the year ended December 31, 2024 and 2023, respectively) (1,289) (1,081) (2,519) (2,161) (4,424) (4,283)
Other income 1 1 6 5 94
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)