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Commitments and Contingencies - Additional information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Operating Leases, Rent Expense	$ 1	$ 3
Rostislav Raykov
Severance Costs Payable In Case Of Termination Other Than For Cause	275	275
Robert Andrade [Member]
Severance Costs Payable In Case Of Termination Other Than For Cause	$ 100	$ 100

X

- Definition

Amount of expenses payable for special or contractual termination benefits provided to current employees in the event of termination other than for cause.

+ References

No definition available.

+ Details

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Namespace Prefix:	fencf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=fencf_RobertAndradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: