XML 79 R69.htm IDEA: XBRL DOCUMENT
v3.23.1

Stockholders' Equity - June 2021 Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Offering costs paid on the issuance of common stock and warrants |  |  |  | $ 334 | $ 969
Investor Warrants |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Sale of common stock (in shares) |  | 990,100 |  |  |
Sale of common stock (in dollars per share) |  | $ 5.05 |  |  |
Amount paid for placement agent commissions |  | $ 400 |  |  |
Amount paid related to expenses for registered direct offering and concurrent private placement |  | 51 |  |  |
Amount paid for clearing fees |  | 19 |  |  |
Offering costs paid on the issuance of common stock and warrants |  |  |  | 469 |
Net proceeds from sale of common stock and warrants |  | $ 4,500 |  |  |
June 2022 Private Placement |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Sale of common stock (in shares) |  |  | 1,313,462 |  |
Sale of common stock (in dollars per share) | $ 1.30 |  | $ 1.30 |  |
Amount paid for placement agent commissions |  |  | $ 252 |  |
Amount paid related to expenses for registered direct offering and concurrent private placement |  |  | 35 |  |
Amount paid for clearing fees |  |  | $ 47 |  |
Offering costs paid on the issuance of common stock and warrants |  |  |  | $ 334 |
Net proceeds from sale of common stock and warrants | $ 3,200 |  |  |  |

X
- Definition Payments For Clearing Fees + References No definition available. + Details
Name: | efoi_PaymentsForClearingFees
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments For Placement Agent Commissions + References No definition available. + Details
Name: | efoi_PaymentsForPlacementAgentCommissions
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments Related To Expenses For Registered Direct Offering And Concurrent Private Placement + References No definition available. + Details
Name: | efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Proceeds from the Issuance of Common Stock and Warrants, Net of Issuance Costs + References No definition available. + Details
Name: | efoi_ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=efoi_InstitutionalInvestorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=efoi_June2022PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |