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Stockholders' Equity - Warrants Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Aug. 06, 2014
Class of Warrant or Right [Line Items] |  |
Exercise Price (in dollars per share) |  | $ 5.40
Exercise price, range one |  |
Class of Warrant or Right [Line Items] |  |
Exercise Price (in dollars per share) | $ 4.30 |
Number of Shares Outstanding (in shares) | 6,750 |
Weighted Average Remaining Contractual Life | 1 year 26 days |
Number of Shares Exercisable (in shares) | 0 |
Weighted Average Exercise Price (in dollars per share) | $ 0.00 |

X
- Definition The number of warrants or rights exercisable. + References No definition available. + Details
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Namespace Prefix: | efoi_
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Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term for warrant or right. + References No definition available. + Details
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Namespace Prefix: | efoi_
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X
- Definition The exercise price of each class of warrants or rights exercisable at the end of the period. + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Details
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