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Nature of Operations (Details)	9 Months Ended
	Sep. 30, 2023 item
Nature of Operations
Number of lead clinical product candidates	2

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- Definition

The number of lead clinical product candidates.

+ References

No definition available.

+ Details

Name:	pasg_NumberOfLeadClinicalProductCandidate
Namespace Prefix:	pasg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration