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Statements of Operations and Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Research and development expenses, related party	$ 404	$ 0
General and administrative expenses, related party	43	(29)
Interest expense, related party	0	(11)
Change in fair value of convertible promissory notes, related party	$ 0	$ (14)

X

- Definition

Change in fair value of convertible promissory notes related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	phat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of interest expense incurred on a debt or other obligation to related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration