XML 67 R54.htm IDEA: XBRL DOCUMENT
v3.19.1

Stockholders' Equity - Summary of Warrant Activity (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares
Warrants Outstanding |  |
Beginning balance (in shares) | shares | 6,750 | 14,250
Warrants canceled/forfeited (in shares) | shares | (6,750) | (7,500)
Ending balance (in shares) | shares | 0 | 6,750
Weighted Average Exercise Price During Period |  |
Beginning balance (in dollars per share) | $ / shares | 4.30 | 4.30
Warrants canceled/forfeited (in dollars per share) | $ / shares | 4.30 | 4.30
Ending balance (in dollars per share) | $ / shares | 0.00 | 4.30

X
- Definition Class of Warrants or Rights, Weighted Average Exercise Price [Abstract] + References No definition available. + Details
Name: | efoi_ClassofWarrantsorRightsWeightedAverageExercisePriceAbstract
Namespace Prefix: | efoi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures, Weighted Average Exercise Price + References No definition available. + Details
Name: | efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsForfeituresWeightedAverageExercisePrice
Namespace Prefix: | efoi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price + References No definition available. + Details
Name: | efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | efoi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration