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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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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