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Debt - PPP Loan (Details) - USD ($) $ in Thousands |  | 5 Months Ended |
--- | --- | --- | ---
Apr. 17, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
PPP loan |  |  | $ 0
PPP loan, net of current maturities |  |  | $ 0
Paycheck Protection Program |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from loan origination | $ 795 |  |
PPP loan |  | $ 362 |
PPP loan, net of current maturities |  | 433 |
Borrowing rate | 1.00% |  |
Accrued interest |  | $ 4 |

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- Definition Payment Protection Program, Current + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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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 Increase for accrued, but unpaid interest on the debt instrument for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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Period Type: | duration

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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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