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Leases - Components of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Sub-lease income	$ (56)	$ (37)	$ (81)	$ (62)
Lease cost	83	141	215	284
Operating lease cost, net	27	104	134	222
Sub-lease income	0	(68)	0	(136)
Lease cost	0	53	0	109
Restructured lease income, net	0	(15)	0	(27)
Total lease cost, net	$ 27	$ 89	$ 134	$ 195

X

- Definition

Operating Lease, Cost, Net Of Sublease Income

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Restructured Lease, Operating Lease, Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
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X

- Definition

Restructured Lease, Operating Lease, Cost, Net Of Sublease Income

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
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X

- Definition

Restructured Lease, Sublease Income

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
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Balance Type:	credit
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X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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- References

No definition available.

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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-Publisher FASB
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X

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
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-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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