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v3.26.1

Summary of Significant Accounting Policies - Cash and Cash Equivalents - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2026
Accounting Policies [Abstract] |
Highly liquid investment maximum maturity period | 3 months

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- Definition Original maturity period for highly liquid investments to be considered cash equivalent, maximum + References No definition available. + Details
Name: | pgen_HighlyLiquidInvestmentMaximumMaturityPeriod
Namespace Prefix: | pgen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration