Represents the percentage of liquidity discount.

No definition available.

Name:	fenc_CollaborativeArrangementLiquidityDiscountPercentage
Namespace Prefix:	fenc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Represents the percentage of expiration of share restriction.

+ References

No definition available.

+ Details

Name:	fenc_ExpirationOfShareRestrictionPercentage
Namespace Prefix:	fenc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

- Definition

Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	fenc_ShareRestrictionExpirationTrancheAxis=fenc_ShareRestrictionExpirationTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fenc_ShareRestrictionExpirationTrancheAxis=fenc_ShareRestrictionExpirationTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fenc_ShareRestrictionExpirationTrancheAxis=fenc_ShareRestrictionExpirationTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_TypeOfArrangementAxis=fenc_LicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value Measurements - Assets/Liabilities Measured at Fair Value (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2020	Jan. 31, 2021	Aug. 31, 2020	Jun. 30, 2021	Mar. 31, 2021	Apr. 30, 2021	Sep. 30, 2021	Jul. 31, 2021	Oct. 31, 2021	Oct. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cash and cash equivalents	$ 30,344						$ 24,335
Processa common shares	$ 265						$ 402
Share price										$ 4.11
Liquidity discount (as a percent)							20.00%
6 month interval
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expiration of share restriction						50.00%
Liquidity discount (as a percent)	20.00%				30.00%
9 month interval
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expiration of share restriction								25.00%
12 month interval
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expiration of share restriction									25.00%
Liquidity discount (as a percent)				40.00%
Quoted Price in Active Markets for Identical Instruments Level 1 [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cash and cash equivalents	$ 678						$ 428
Significant Other Observable Inputs Level 2 [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cash and cash equivalents	29,666						23,907
Processa common shares	$ 265						$ 402
Restricted shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares to be issued under agreement							41,000
Processa Pharmaceuticals, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares to be issued under agreement			825,000
License agreement \| Processa Pharmaceuticals, Inc \| Restricted shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares to be issued under agreement		41