XML 51 R36.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Nature of Operations - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) region sales_agent
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Reduction of full-time equivalent headcount, percent | 51.00%
Decrease in operating expense | $ (8.4)
Restructuring costs and asset impairment charges | $ 1.8
Number of geographic regions | region | 6
Number of sales agents | sales_agent | 30

X
- Definition Impact Of Restructuring Activities On Operating Expenses + References No definition available. + Details
Name: | efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sales Coverage, Number Of Geographic Regions + References No definition available. + Details
Name: | efoi_SalesCoverageNumberOfGeographicRegions
Namespace Prefix: | efoi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sales Coverage, Number Of Sales Agents + References No definition available. + Details
Name: | efoi_SalesCoverageNumberOfSalesAgents
Namespace Prefix: | efoi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_RestructuringCostsAndAssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration