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Summary of Significant Accounting Policies - Research and Development - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Accounting Policies [Abstract] |  |
Research and development commitments not yet incurred | $ 5,037 | $ 6,220
Research and development commitments, cancellation terms, required written notice, period prior to desired termination date | 60 days |

X
- Definition Research And Development Commitments, Cancellation Terms, Required Written Notice, Period Prior To Desired Termination Date + References No definition available. + Details
Name: | pgen_ResearchAndDevelopmentCommitmentsCancellationTermsRequiredWrittenNoticePeriodPriorToDesiredTerminationDate
Namespace Prefix: | pgen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Portion of commitments related to research and development arrangements with third parties which has not yet been incurred. + References No definition available. + Details
Name: | pgen_ResearchAndDevelopmentCommitmentsNotYetIncurred
Namespace Prefix: | pgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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