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Consolidated Statements of Changes in Stockholders' Equity (Deficit) (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Statement of Stockholders' Equity [Abstract]
Issuance costs	$ 5.9
Offering costs	$ 3.7

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- Definition

Stock Offering Costs

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Balance Type:	debit
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- Definition

Underwriters’ Discounts and Commissions

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No definition available.

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

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No definition available.

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Namespace Prefix:	us-gaap_
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