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Significant Accounting Policies - Accrued Receivable and Accrued Claims Payable (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Accrued receivables | $ 17.3 | $ 9.5
Accrued claims payable | 11.6 | 6.7
Unbilled receivables | $ 9.2 | $ 3.6

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- Definition Accrued Claims Payable, Current + References No definition available. + Details
Name: | pgny_AccruedClaimsPayableCurrent
Namespace Prefix: | pgny_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued Receivables + References No definition available. + Details
Name: | pgny_AccruedReceivables
Namespace Prefix: | pgny_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant