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Significant Accounting Policies - Cost of Products Sold (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Significant Accounting Policies
Manufacturing costs capitalized to inventory	$ 2,477
Manufacturing costs capitalized to inventory, raw materials	1,437
Manufacturing costs capitalized to inventory, work-in-process	851
Manufacturing costs capitalized to inventory, finished goods	$ 189

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- Definition

Manufacturing costs related to PEDMARK and capitalized to inventory.

+ References

No definition available.

+ Details

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Namespace Prefix:	fenc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Manufacturing costs related to PEDMARK and capitalized to inventory, amount classified as finished goods.

+ References

No definition available.

+ Details

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Namespace Prefix:	fenc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Manufacturing costs related to PEDMARK and capitalized to inventory, amount classified as raw materials.

+ References

No definition available.

+ Details

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Namespace Prefix:	fenc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Manufacturing costs related to PEDMARK and capitalized to inventory, amount classified as work-in-process.

+ References

No definition available.

+ Details

Name:	fenc_ManufacturingCostsCapitalizedToInventoryWorkInProcess
Namespace Prefix:	fenc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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