Name:	pasg_AccruedDivestitureFeesCurrent
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of payable per product candidate for rare monogenic disorders upon achievement of specific development milestone payment on collaboration and license agreement.

No definition available.

Name:	pasg_CollaborationAgreementAmountPayablePerProductCandidateForRareMonogenicDisordersUponAchievementOfSpecificDevelopmentMilestone
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of payable per product candidate upon achievement of specific development milestone payment on collaboration and license agreement.

No definition available.

Name:	pasg_CollaborationAgreementAmountPayablePerProductCandidateUponAchievementOfSpecificDevelopmentMilestone
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of payable on sales milestone payment on collaboration and license agreement.

No definition available.

Name:	pasg_CollaborationAgreementSalesMilestonePaymentsPayable
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Number of shares agreed to be issued by defendant and subject to reverse stock split.

No definition available.

Name:	pasg_LossContingencySharesAgreedByDefendant
Namespace Prefix:	pasg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Amount of aggregate non-refundable fees payable per product indication.

No definition available.

Name:	pasg_NonRefundableAggregateFeesPayablePerProductIndication
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of upfront fees payable per product indication upon developmental milestone.

No definition available.

Name:	pasg_NonRefundableFeesPayablePerProductIndicationUponDevelopmentalMilestone
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of upfront fees payable per product indication.

No definition available.

Name:	pasg_NonRefundableUpfrontFeesPayablePerProductIndication
Namespace Prefix:	pasg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the percentage of target annual bonus amounts.

No definition available.

Name:	pasg_PercentageOfTargetAnnualBonusAmounts
Namespace Prefix:	pasg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

The number of stock issued during period for settlement of litigation.

No definition available.

Name:	pasg_StockIssuedDuringPeriodSettlementOfLitigation
Namespace Prefix:	pasg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

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

Amount of loss contingency liability.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10