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Stockholders' Equity - Warrants to Purchase Common Stock (Details) - $ / shares shares in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Class of Warrant or Right [Line Items] |  |
Exercised warrants during period | 0 | 0
Issued warrants during period | 0 | 0
Warrants |  |
Class of Warrant or Right [Line Items] |  |
Common shares issuable upon exercise of outstanding warrants, beginning balance | 150 | 150
Warrants outstanding | 150 | 150
Common shares issuable upon exercise of outstanding warrants, ending balance | 150 | 150
Weighted-average exercise price, beginning of period | $ 7.71 | $ 7.71
Weighted-average exercise price, end of period | $ 7.71 | $ 7.71

X
- Definition The number warrants issued by the company during the relevant period. + References No definition available. + Details
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Namespace Prefix: | fenc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the warrants exercised during period. + References No definition available. + Details
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Namespace Prefix: | fenc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |