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Convertible Preferred Stock - Non-cash Contribution (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Temporary Equity Disclosure [Abstract]
Non-cash contribution	$ 414

X

- Definition

The amount of adjustments to additional paid in capital attributable to non-cash distribution during the period.

+ References

No definition available.

+ Details

Name:	pgny_AdjustmentsToAdditionalPaidInCapitalNonCashDistribution
Namespace Prefix:	pgny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration