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Significant Accounting Policies - Revenue recognition (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2022 shares
Processa Pharmaceuticals, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares to be issued under agreement	46

X

- Definition

Represents the number of shares entitled to receive under license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fenc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_CounterpartyNameAxis=fenc_ProcessaPharmaceuticalsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: