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Significant Accounting Policies - Product Sales Discounts and Allowances Continued (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 USD ($)
Provision for discounts and allowances, beginning balance | $ 795
Current period | 1,992
Payments and customer credits issued | (601)
Provision for discounts and allowances, ending balance | 2,186
Chargebacks, Discounts for Prompt pay and Other allowances |
Provision for discounts and allowances, beginning balance | 365
Current period | 352
Payments and customer credits issued | (497)
Provision for discounts and allowances, ending balance | 220
Rebates, Customer Fees/Credits and Co-pay Assistance |
Provision for discounts and allowances, beginning balance | 430
Current period | 1,640
Payments and customer credits issued | (104)
Provision for discounts and allowances, ending balance | $ 1,966

X
- Definition Payments made against the Company's provision for product sales discounts and allowances. + References No definition available. + Details
Name: | fenc_DiscountsAndAllowancesPaymentsAndCustomerCreditsIssued
Namespace Prefix: | fenc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected discounts and allowances on gross sales. + References No definition available. + Details
Name: | fenc_DiscountsAndAllowancesProvisionForCurrentPeriodSales
Namespace Prefix: | fenc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Provision for aggregate discounts and allowances provided to customers and offset to gross revenues earned. + References No definition available. + Details
Name: | fenc_ProvisionForDiscountsAndAllowances
Namespace Prefix: | fenc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_StatementScenarioAxis=fenc_ChargebacksDiscountsForPromptPayAndOtherAllowancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=fenc_RebatesCustomerFeesCreditsAndCoPayAssistanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |