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Significant Accounting Policies - Cost of Services (Details)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Contract Term, Clinics, Low End of Range	1 year
Contract Term, Clinics, High End of Range	2 years

X

- Definition

Contract Term, Clinics, High End of Range

+ References

No definition available.

+ Details

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Namespace Prefix:	pgny_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract Term, Clinics, Low End of Range

+ References

No definition available.

+ Details

Name:	pgny_ContractTermClinicsLowEndOfRange
Namespace Prefix:	pgny_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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