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Convertible Preferred Stock - Liquidation Preference (Details)	9 Months Ended
	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