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Revenue Interest Financing Liability - Schedule of Total Revenue Interest Financing Liability (Details) $ in Thousands | 3 Months Ended
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Jun. 30, 2022 USD ($)
Contract with Customer, Liability [Abstract] |
Proceeds from the Revenue Interest Financing Agreement | $ 100,000
Less: transaction costs | (4,554)
Plus: interest expense | 2,657
Ending liability balance | $ 98,103

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- Definition Gross proceeds from revenue interest financing agreement. + References No definition available. + Details
Name: | phat_GrossProceedsFromRevenueInterestFinancingAgreement
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Interest expense related to revenue interest financing liability + References No definition available. + Details
Name: | phat_InterestExpenseRelatedToRevenueInterestFinancingLiability
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Payment of transaction costs. + References No definition available. + Details
Name: | phat_PaymentOfTransactionCosts
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue interest financing liability. + References No definition available. + Details
Name: | phat_RevenueInterestFinancingLiability
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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