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Convertible Preferred Stock Warrants - Warrants Issued (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Warrants to purchase convertible preferred stock
Class of Warrant or Right [Line Items]
Warrants issued (in shares)	0	0

X

- Definition

Class of Warrant or Right, Issued

+ References

No definition available.

+ Details

Name:	pgny_ClassOfWarrantOrRightIssued
Namespace Prefix:	pgny_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=pgny_SeriesBConvertiblePreferredStockWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: