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Significant Accounting Policies - Product Sales Discounts and Allowances Continued (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Current period	$ 235
Payments and customer credits issued	(1)
Provision for discounts and allowances, ending balance	234
Chargebacks, Discounts for Prompt pay and Other allowances
Current period	72
Payments and customer credits issued	(1)
Provision for discounts and allowances, ending balance	71
Rebates, Customer Fees/Credits and Co-pay Assistance
Current period	163
Provision for discounts and allowances, ending balance	$ 163

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: