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Commitments and Contingencies (Details) - USD ($)		1 Months Ended
	Jan. 23, 2020	Sep. 30, 2021	Jan. 24, 2020
Rent expense	$ 1,000	$ 400
Security deposit			$ 2,000
Rostislav Raykov [Member]
Severance Costs Payable In Case Of Termination Other Than For Cause		442,000
Robert Andrade [Member]
Severance Costs Payable In Case Of Termination Other Than For Cause		160,000
Goel [Member]
Severance Costs Payable In Case Of Termination Other Than For Cause		$ 184,000

X

- Definition

Amount of expenses payable for special or contractual termination benefits provided to current employees in the event of termination other than for cause.

+ References

No definition available.

+ Details

Name:	fenc_SeveranceCostsPayableInCaseOfTerminationOtherThanForCause
Namespace Prefix:	fenc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

+ Details

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

X

- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_SecurityDepositLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=fenc_RobertAndradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=fenc_Ms.GoelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: