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Commitments and Contingencies - Sublease (Details) - Corporate Offices, Sublease $ in Millions	Sep. 30, 2019 USD ($) ft²
Operating Leased Assets [Line Items]
Leased space (in square feet) | ft²	25,212
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

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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

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingLeasedAssetsLineItems
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: