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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 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 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)
[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.