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Significant Accounting Policies - Cost of Products Sold (Details) - PEDMARK $ in Thousands | 3 Months Ended
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Mar. 31, 2024 USD ($)
Percentage of royalties | 1.00%
Manufacturing costs capitalized to inventory | $ 2,064
Manufacturing costs capitalized to inventory, work-in-process | 774
Manufacturing costs capitalized to inventory, finished goods | 1,290,000
Manufacturing costs capitalized to inventory, cost of products sold | $ 550

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- Definition Manufacturing costs related to PEDMARK and capitalized to inventory. + References No definition available. + Details
Name: | fenc_ManufacturingCostsCapitalizedToInventory
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 reclassified as cost.of products sold. + References No definition available. + Details
Name: | fenc_ManufacturingCostsCapitalizedToInventoryCostOfProductsSold
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
Name: | fenc_ManufacturingCostsCapitalizedToInventoryFinishedGoods
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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- Definition Represents the percentage of royalties to be received as consideration. + References No definition available. + Details
Name: | fenc_RoyaltiesPercentage
Namespace Prefix: | fenc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=fenc_PedmarkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |