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Leases - General Information (Details) - Corporate Offices, Sublease $ in Millions	Sep. 30, 2019 USD ($)
Lessee, Operating Lease, Description [Abstract]
Operating lease, sublease, base rent per annum, through year five	$ 1.3
Operating lease, sublease, base rent per annum, after year five	$ 1.4

X

- Definition

Operating Lease, Sublease, Base Rent Per Annum, After Year Five

+ References

No definition available.

+ Details

Name:	pgny_OperatingLeaseSubleaseBaseRentPerAnnumAfterYearFive
Namespace Prefix:	pgny_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Operating Lease, Sublease, Base Rent Per Annum, Through Year Five

+ References

No definition available.

+ Details

Name:	pgny_OperatingLeaseSubleaseBaseRentPerAnnumThroughYearFive
Namespace Prefix:	pgny_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	srt_CounterpartyNameAxis=pgny_CorporateOfficesSubleaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: