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Inventories - Reserve Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Inventory, Reserve [Roll Forward] |  |  |  |
Beginning balance | $ (2,792) | $ (2,956) | $ (3,050) | $ (2,894)
Accrual | (241) | 34 | (442) | (64)
Reduction due to sold inventory | 21 | 36 | 278 | 72
Write-off for disposed inventory | 353 | 0 | 555 | 0
Reserves for excess, obsolete, and slow-moving inventories | $ (2,659) | $ (2,886) | $ (2,659) | $ (2,886)

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- Definition Inventory, Reserve + References No definition available. + Details
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- Definition Inventory Valuation Reserves, Provision (Accrual) + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Inventory Valuation Reserves, Raw Materials + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Inventory Valuation Reserves, Sales Of Inventory + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Inventory Valuation Reserves, Write-Offs + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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