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

X

- 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