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Stockholders' Equity - Warrants to Purchase Common Stock (Details) - Warrants to Purchase Common Shares - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Class of Warrant or Right [Line Items]
Issued warrants during period	0	0
Exercised warrants during period	0	0
Weighted Average Remaining Life (years)	2 years 9 months 18 days
Common shares issuable upon exercise of outstanding warrants, beginning balance	150
Common shares issuable upon exercise of outstanding warrants, ending balance	150
Weighted-average exercise price, beginning of period	$ 7.71
Weighted-average exercise price, end of period	$ 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

Name:	fenc_StockIssuedDuringPeriodSharesWarrantsExercised
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

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (e)(1)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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