XML 18 R49.htm IDEA: XBRL DOCUMENT
v3.20.1

CAPITAL STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 20, 2020 | Mar. 31, 2020
Bought Deal Public Offering |  |
Class of Warrant or Right [Line Items] |  |
Sale of stock, number of shares issued (in shares) | 11,300,000 |
Price per share (in dollars per share) | $ 1.47 |
Sale of stock, consideration received | $ 15,140 |
At The Market Sale Of Stock |  |
Class of Warrant or Right [Line Items] |  |
Sale of stock, number of shares issued (in shares) |  | 2,388,815
Sale of stock, consideration received |  | $ 3,960

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
Name: | us-gaap_ClassOfWarrantOrRightLineItems
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
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
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
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=efr_BoughtDealPublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=efr_AtTheMarketSaleOfStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |