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INVENTORIES - Reserve Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Inventory, Reserve [Roll Forward] |  |  |  |
Beginning balance | $ (225) | $ (2,400) | $ (2,553) | $ (2,527)
Accrual | (105) | (169) | (330) | (155)
Reduction due to sold inventory | 0 | 109 | 89 | 222
Reduction due to future permanent markdowns | 0 | 0 | 2,464 | 0
Reserves for excess, obsolete, and slow-moving inventories | $ (330) | $ (2,460) | $ (330) | $ (2,460)

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- Definition Inventory, Reserve + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Inventory Valuation Reserves, Permanent Markdowns + References No definition available. + Details
Name: | efoi_InventoryValuationReservesPermanentMarkdowns
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Inventory Valuation Reserves, Provision (Accrual) + References No definition available. + Details
Name: | efoi_InventoryValuationReservesProvisionAccrual
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Inventory Valuation Reserves, Raw Materials + References No definition available. + Details
Name: | efoi_InventoryValuationReservesRawMaterials
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Inventory Valuation Reserves, Sales Of Inventory + References No definition available. + Details
Name: | efoi_InventoryValuationReservesSalesOfInventory
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration