Additional number of common shares reserved for future issuance.

No definition available.

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

- Definition

Represents the percentage of total number of shares of the Company's common stock outstanding equal to which shares may be issued under Employee Stock Purchase Plan.

+ References

No definition available.

+ Details

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

- Definition

The maximum amount of common stock that a participant may accrue rights to purchase for each calendar year in which such right is outstanding.

+ References

No definition available.

+ Details

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

- Definition

Represents the maximum contribution percentage on eligible compensation by eligible employees under Employee Stock Purchase Plan.

+ References

No definition available.

+ Details

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

- Definition

Number of shares that can be purchased.

+ References

No definition available.

+ Details

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

- Definition

Represents the period till which there is automatic annual increase in rights granted under the employee stock purchase plan.

+ References

No definition available.

+ Details

Name:	pasg_EmployeeStockPurchasePlanPeriodTillWhichAutomaticIncreaseInRightsGranted
Namespace Prefix:	pasg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The stock purchase price percentage on the lower of the fair market value of the Company's common stock on the first or last day of the respective offering period under the ESPP.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of equity incentive plans.

+ References

No definition available.

+ Details

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

- Definition

Duration from date of grant (issuance of an option) to when option auto expires.

+ References

No definition available.

+ Details

Name:	pasg_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerm
Namespace Prefix:	pasg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of outstanding common shares to be taken as automatic annual increase in rights granted under the share based payment arrangement

+ References

No definition available.

+ Details

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

- Definition

Represents the period till which there is automatic annual increase in rights granted under the share based payment arrangement.

+ References

No definition available.

+ Details

Name:	pasg_ShareBasedPaymentArrangementPeriodTillWhichAutomaticIncreaseInRightsGranted
Namespace Prefix:	pasg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_PlanNameAxis=pasg_EquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=pasg_EquityInducementPlan2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=pasg_EmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Share-Based Compensation - Equity Incentive Plan & ESPP (Details)				3 Months Ended		9 Months Ended
	Jan. 01, 2023 shares	Jan. 01, 2022 shares	Feb. 28, 2020 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) plan shares	Sep. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans \| plan						3
Number of shares purchased			4,000
Share-based compensation expense \| $				$ 2,824,000	$ 2,862,000	$ 9,351,000	$ 15,477,000
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized				13,101,661		13,101,661
Shares available for future grant				7,644,421		7,644,421
Period till which there is automatic increase in rights granted under the Plan						10 years
Percent of the total number of shares of the Company's common stock outstanding						5.00%
Term of award						10 years
Vesting period						4 years
Additional number of common shares reserved for future issuance	2,730,735	2,712,249
Equity Inducement Plan 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized				2,500,000		2,500,000
Shares available for future grant				1,006,655		1,006,655
Term of award						10 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	1,981,766		1,981,766
Shares available for future grant				1,565,821		1,565,821
Additional number of common shares reserved for future issuance	546,147
Period till which there is automatic increase in rights granted under ESPP			10 years
Percentage of common stock outstanding			1.00%
Percentage of stock purchase price			85.00%
Percentage of maximum employee contribution			15.00%
Maximum amount of common stock that can be purchased \| $			$ 25,000
Share-based compensation expense \| $						$ 0	$ 200,000