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Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Statement of Cash Flows [Abstract] |  |
Related parties prepaid expenses and other assets current | $ 0 | $ 82
Related parties accounts payable and accrued expenses | $ (1,102) | $ 722

X
- Definition Increase (decrease) in accounts payable and accrued expenses related parties. + References No definition available. + Details
Name: | phat_IncreaseDecreaseInAccountsPayableAndAccruedExpensesRelatedParties
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (decrease)in prepaid expenses and other assets related parties current. + References No definition available. + Details
Name: | phat_IncreaseDecreaseInPrepaidExpensesAndOtherAssetsRelatedPartiesCurrent
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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