XML 17 R5.htm IDEA: XBRL DOCUMENT
v3.23.2

Statements of Operations and Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Statement [Abstract] |  |  |  |
Research and development expenses, related party | $ 233 | $ 370 | $ 407 | $ 1,800
General and administrative expenses, related party | $ 14 | $ 0 | $ 17 | $ 0

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