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v3.19.3

Convertible Preferred Stock - Liquidation Preference (Details) | 9 Months Ended
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Sep. 30, 2019
Temporary Equity Disclosure [Abstract] |
Liquidation preference (as a percent) | 60.00%

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- Definition Temporary Equity, Liquidation Preference Percentage + References No definition available. + Details
Name: | pgny_TemporaryEquityLiquidationPreferencePercentage
Namespace Prefix: | pgny_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TemporaryEquityDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration