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v3.19.3

Convertible Preferred Stock Warrants - Warrants Issued (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Warrants to purchase convertible preferred stock |  |
Class of Warrant or Right [Line Items] |  |
Warrants issued (in shares) | 0 | 0

X
- Definition Class of Warrant or Right, Issued + References No definition available. + Details
Name: | pgny_ClassOfWarrantOrRightIssued
Namespace Prefix: | pgny_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=pgny_SeriesBConvertiblePreferredStockWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |