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Related Party Transactions (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 26, 2021 shares | Feb. 16, 2021 | Aug. 31, 2021 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) patient agreement | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) patient agreement | Dec. 31, 2023 shares
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  |  |  |  | 119,347,688 |  | 119,347,688 |  | 103,673,728
Fresenius Medical Care | Fresenius Medical Care |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Financing transaction | $ |  |  |  | $ 150.0 |  |  |  |  |
Conversion of stock (in shares) | shares | 15,812,735 |  |  |  |  |  |  |  |
Proceeds from PIPE Financing | $ |  |  | $ 25.0 |  |  |  |  |  |
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 |  | 3 |
Number of adult patients | patient |  |  |  |  |  | 178,575 |  | 178,575 |
Clinical research services expense | $ |  |  |  |  | $ 0.0 | $ 0.2 | $ 0.0 | $ 0.2 |

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