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Related Party Transactions (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 26, 2021
shares
Feb. 16, 2021
Aug. 31, 2021
USD ($)
shares
Jun. 30, 2018
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
shares
Jun. 30, 2023
agreement
patient
Related Party Transaction [Line Items]                    
Common stock issued (in shares) | shares         119,842,940   119,842,940   103,673,728  
Accounts payable         $ 6,903   $ 6,903   $ 6,490  
Yale University | License Expenses                    
Related Party Transaction [Line Items]                    
License fees             100 $ 100    
Fresenius Medical Care | Fresenius Medical Care                    
Related Party Transaction [Line Items]                    
Financing transaction       $ 150,000            
Conversion of stock (in shares) | shares 15,812,735                  
Proceeds from PIPE Financing     $ 25,000              
Common stock issued (in shares) | shares     2,500,000              
Distribution agreement, termination period   12 months                
Fresenius Medical Care | Frenova Renal Research                    
Related Party Transaction [Line Items]                    
Number of services agreements entered into | agreement                   3
Number of adult patients | patient                   178,575
Clinical research services expense               200    
Fresenius Medical Care | Fresenius Medical Care Deutschland GmbH                    
Related Party Transaction [Line Items]                    
Clinical research services expense         100 $ 0 100 $ 100    
Accounts payable         $ 100   $ 100