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

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- 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

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

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