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Debt - PPP Loan (Details) - USD ($) $ in Thousands | Apr. 17, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 29, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
PPP loan |  | $ 529 | $ 0 |
PPP loan, net of current maturities |  | $ 266 | $ 0 |
Stated interest rate |  |  |  | 5.00%
Paycheck Protection Program CARES Act |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from loan origination | $ 795 |  |  |
Stated interest rate | 1.00% |  |  |

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- Definition Payment Protection Program, Current + References No definition available. + Details
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- Definition Payment Protection Program, Noncurrent + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- 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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- Definition Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Details
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Balance Type: |
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