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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%

X

- Definition

Payment Protection Program, Current

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Payment Protection Program, Noncurrent

+ References

No definition available.

+ Details

Name:	efoi_PaymentProtectionProgramNoncurrent
Namespace Prefix:	efoi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

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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.

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Namespace Prefix:	us-gaap_
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X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

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Namespace Prefix:
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Balance Type:
Period Type: