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INVENTORIES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Inventory Disclosure [Abstract] |  |
Impairment loss | $ 14,350 | $ 4,580

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- Definition Impairment Loss Related to Concentrations and Work-in-Progress Inventory + References No definition available. + Details
Name: | efr_ImpairmentLossRelatedtoConcentrationsandWorkinProgressInventory
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration