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Commitments and Contingencies - Narrative (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Outstanding purchase commitment | $ 0.5
Outstanding purchase commitments percentage | 49.00%

X
- Definition Purchase Obligation Percentage + References No definition available. + Details
Name: | efoi_PurchaseObligationPercentage
Namespace Prefix: | efoi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant