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v3.22.2.2

Stockholders' Equity - Warrants to Purchase Common Stock (Details) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022
Stockholders' Equity |  |
Outstanding and exercisable at the beginning | 39,000 | 39,000
Issued | 111,000 |
Outstanding and exercisable at the end | 150,000 | 150,000
Exercised |  | 0
Weighted-Average Outstanding, beginning | $ 6.80 | $ 6.80
Issued | 8.11 |
Weighted-Average Outstanding, end | $ 7.30 | $ 7.30

X
- Definition The total number of warrants exercised by the investors during the period. + References No definition available. + Details
Name: | fenc_ClassOfWarrantOrRightExercised
Namespace Prefix: | fenc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Exercise Price Of Warrants Issued during the relevant period + References No definition available. + Details
Name: | fenc_ExercisePriceOfWarrantsIssued
Namespace Prefix: | fenc_
Data Type: | dtr-types:perShareItemType
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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration