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Stockholders' Equity - Warrants (Details) | 9 Months Ended
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Sep. 30, 2020 $ / shares shares
Share-based Payment Arrangement [Abstract] |
Sale of common stock (in shares) | shares | 539,152
Exercise price of common stock (in dollars per share) | $ / shares | $ 3.50

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- Definition Class Of Warrant Or Right, Warrants Issued + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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