XML 80 R65.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Related Party Transactions (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2014 | Feb. 27, 2012 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2017
5 Elements Global Advisors |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership in reporting entity by related party |  |  |  |  |  | 2.50%
5 Elements Efficiencies (BVI) Ltd. |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership in reporting entity by related party |  |  |  |  |  | 2.40%
5 Elements Efficiencies (BVI) Ltd. | Yeh-Mei Cheng |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest | 50.00% |  |  |  |  |
Communal |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership in reporting entity by related party | 5.00% |  |  |  |  |
Related party transaction, term of agreement |  | 60 months |  |  |  |
Amount paid |  |  |  | $ 425 | $ 523 |
Recorded expense |  |  | $ 226 | $ 226 |  |
Communal | 5 Elements Efficiencies (BVI) Ltd. |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest | 50.00% |  |  |  |  |

X
- Definition Related Party Transaction, Term of Agreement + References No definition available. + Details
Name: | efoi_RelatedPartyTransactionTermofAgreement
Namespace Prefix: | efoi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transactions, Ownership in Reporting Entity by Related Party + References No definition available. + Details
Name: | efoi_RelatedPartyTransactionsOwnershipinReportingEntitybyRelatedParty
Namespace Prefix: | efoi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=efoi_A5ElementsGlobalAdvisorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=efoi_FiveElementsEfficientiesBVILtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=efoi_YehMeiChengMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=efoi_CommunalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |