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v3.19.1

CAPITAL STOCK - Narrative (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) shares
Class of Warrant or Right [Line Items] |
Warrant issued (in shares) | 2,328,925
At The Market Sale Of Stock |
Class of Warrant or Right [Line Items] |
Sale of stock, number of shares issued (in shares) | 754,712
Sale of stock, consideration received | $ | $ 2,410

X
- Definition Class of Warrant or Right, Issued + References No definition available. + Details
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Namespace Prefix: | efr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |