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Statements of Operations and Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Statement [Abstract] |  |  |  |
Research and development expenses, related party | $ 370 | $ 905 | $ 1,800 | $ 1,846
General and administrative expenses, related party | $ 0 | $ 0 | $ 0 | $ 16

X
- Definition General and administrative expense related party. + References No definition available. + Details
Name: | phat_GeneralAndAdministrativeExpenseRelatedParty
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Research and development expense related party. + References No definition available. + Details
Name: | phat_ResearchAndDevelopmentExpenseRelatedParty
Namespace Prefix: | phat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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