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Subsequent Events - 2019 Equity Incentive Plan (Details) - Subsequent Event - 2019 Equity Incentive Plan | Oct. 31, 2019 shares
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Subsequent Event [Line Items] |
Maximum number of shares (in shares) | 19,198,875
Maximum number of shares, new shares (in shares) | 2,640,031
Maximum number of shares, additional shares (in shares) | 16,558,844

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Additional Shares + References No definition available. + Details
Name: | pgny_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAdditionalShares
Namespace Prefix: | pgny_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, New Shares + References No definition available. + Details
Name: | pgny_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedNewShares
Namespace Prefix: | pgny_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_PlanNameAxis=pgny_EquityIncentivePlan2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |