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Investments (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Marketable Debt Securities [Member] |  |  |  |
Allowance for credit losses for investments | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Investments Allowance For Credit Loss + References No definition available. + Details
Name: | prok_InvestmentsAllowanceForCreditLoss
Namespace Prefix: | prok_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=prok_MarketableDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |