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Stockholders' Equity - Recognized Contractor and Employee Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Recognized Employee Expense [Line Items]
Total option expense recognized	$ 2,219	$ 1,821	$ 4,511	$ 3,937
Employee Options
Recognized Employee Expense [Line Items]
Total option expense recognized	$ 2,219	$ 1,821	$ 4,511	$ 3,937

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- References

No definition available.

+ Details

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Namespace Prefix:	fenc_
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Balance Type:	na
Period Type:	duration

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- Definition

Amount of noncash expense for option under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: