v3.26.1
Debt - Schedule of Debt Instruments and their Changes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule of Debt Instruments and their Changes [Line Items]              
Issuance of debt         $ 1,500  
Change in fair value         4,720  
Conversion of debt to equity $ 418     676  
Convertible Loans Payable [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning 6,977 $ 7,877     $ 7,877    
Accounting basis          Fair value option    
Conversion price(s) per share, as affected by the Reverse Stock Splits         various    
Debt repayments (765) (195)          
Issuance of debt 1,500            
Change in fair value 3,910 555          
Conversion of debt to equity (3,460) (1,260)          
Debt forgiven          
Accrued stated interest          
Balance at Ending 8,162 6,977     $ 8,162   $ 7,877
Tasly Convertible Debt - Related Party [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning $ 2,532 2,290 2,390 $ 2,234 $ 2,290 2,234 2,234
Accounting basis          Fair value option    
Interest rate 24.00%       24.00%    
Conversion price(s) per share, as affected by the Reverse Stock Splits         14,400.00    
Maturity         Mar. 31, 2024    
Debt repayments          
Issuance of debt        
Change in fair value 97 242 (38) 156      
Stated interest     191      
Amortization of debt discount and issuance costs          
Conversion of debt to equity          
Debt forgiven          
Accrued stated interest          
Balance at Ending 2,629 2,532 2,543 2,390 $ 2,629 2,543 2,290
Convertible Promissory Note – Related Party [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning $ 1,870 1,870     $ 1,870    
Accounting basis          Fair value option    
Interest rate          
Maturity         Dec. 31, 2026    
Debt repayments          
Issuance of debt            
Change in fair value 244          
Conversion of debt to equity          
Debt forgiven          
Accrued stated interest          
Balance at Ending 2,114 1,870     $ 2,114   1,870
Convertible senior notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning 43 42 26,589 25,268 $ 42 25,268 25,268
Accounting basis          Effective interest method    
Conversion price(s) per share, as affected by the Reverse Stock Splits         3,750.00    
Maturity         Jul. 11, 2025    
Debt repayments          
Issuance of debt   700 750      
Change in fair value      
Stated interest     604 572      
Amortization of debt discount and issuance costs     2 (1)      
Conversion of debt to equity          
Debt forgiven          
Accrued stated interest 2 1          
Balance at Ending 45 43 27,895 26,589 $ 45 27,895 42
Promissory Notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning 1,040 1,049 925 910 $ 1,049 910 910
Accounting basis          Simple interest method    
Conversion price(s) per share, as affected by the Reverse Stock Splits            
Debt repayments (24)          
Issuance of debt        
Change in fair value      
Stated interest     15 15      
Amortization of debt discount and issuance costs          
Conversion of debt to equity          
Debt forgiven          
Accrued stated interest 14 15          
Balance at Ending 1,054 1,040 940 925 $ 1,054 940 1,049
PPP Loan [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning 1,390 1,379 1,376 $ 1,390 1,376 1,376
Accounting basis          Compounding Interest    
Interest rate 1.00%       1.00%    
Conversion price(s) per share, as affected by the Reverse Stock Splits            
Maturity            
Debt repayments          
Issuance of debt        
Change in fair value      
Stated interest     4 3      
Amortization of debt discount and issuance costs          
Conversion of debt to equity          
Debt forgiven (1,392)          
Accrued stated interest 2          
Balance at Ending 1,383 1,379 1,383 1,390
D&O Insurance Financing [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning $ 75 297     $ 297    
Accounting basis         Simple interest method    
Interest rate 7.00%       7.00%    
Conversion price(s) per share, as affected by the Reverse Stock Splits            
Maturity         Apr. 11, 2026    
Debt repayments $ (75) (222)          
Issuance of debt            
Change in fair value          
Conversion of debt to equity          
Debt forgiven            
Accrued stated interest          
Balance at Ending $ 75       297
Junior Convertible Notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Balance at Beginning     18,965 18,419   18,419 $ 18,419
Issuance of debt          
Change in fair value          
Stated interest     553 545      
Amortization of debt discount and issuance costs     15 1      
Balance at Ending     $ 19,533 $ 18,965   $ 19,533  
Minimum [Member] | Convertible Loans Payable [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Interest rate 10.00%       10.00%    
Minimum [Member] | Convertible Promissory Note – Related Party [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Conversion price(s) per share, as affected by the Reverse Stock Splits         7,500.00    
Minimum [Member] | Convertible senior notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Interest rate 0.00%       0.00%    
Conversion price(s) per share, as affected by the Reverse Stock Splits         16,650.00    
Minimum [Member] | Promissory Notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Interest rate 0.00%       0.00%    
Maximum [Member] | Convertible Loans Payable [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Interest rate 12.00%       12.00%    
Maximum [Member] | Convertible Promissory Note – Related Party [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Conversion price(s) per share, as affected by the Reverse Stock Splits         16,650.00    
Maximum [Member] | Convertible senior notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Interest rate 12.00%       12.00%    
Conversion price(s) per share, as affected by the Reverse Stock Splits         30,000.00    
Maximum [Member] | Promissory Notes [Member]              
Schedule of Debt Instruments and their Changes [Line Items]              
Interest rate 12.00%       12.00%