Convertible Preferred Stock - Non-cash Contribution (Details) $ in Thousands	1 Months Ended
Jun. 30, 2018 USD ($)
Temporary Equity Disclosure [Abstract]
Non-cash contribution	$ 414

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

No definition available.

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