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Commitments and Contingencies - Sublease (Details) - Corporate Offices, Sublease $ in Millions | Sep. 30, 2019 USD ($) ft²
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Operating Leased Assets [Line Items] |
Leased space (in square feet) | ft² | 25,212
Operating lease, sublease, base rent per annum, through year five | $ 1.3
Operating lease, sublease, base rent per annum, after year five | $ 1.4

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- Definition Operating Lease, Sublease, Base Rent Per Annum, After Year Five + References No definition available. + Details
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Namespace Prefix: | pgny_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating Lease, Sublease, Base Rent Per Annum, Through Year Five + References No definition available. + Details
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Namespace Prefix: | pgny_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- 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_OperatingLeasedAssetsLineItems
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: |
Data Type: | na
Balance Type: |
Period Type: |