XML 57 R48.htm IDEA: XBRL DOCUMENT
v3.22.2

Stockholders' Equity - June 2022 and December 2021 Private Placement (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 16, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Amount paid for clearing fees |  |  |  | $ 18 |  |  |  |
Offering costs paid on the issuance of common stock and warrants |  |  |  |  | $ 334 | $ 469 | $ 334 | $ 469
Warrants issued (in shares) |  |  |  |  |  |  | 229,414 | 310,860
December 2021 Private Placement |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Sale of common stock (in shares) |  |  | 1,193,185 |  |  |  |  |
Sale of common stock (USD per share) |  |  | $ 3.52 |  |  |  |  |
Securities called by warrants (in shares) |  | 1,278,413 |  |  | 1,278,413 |  | 1,278,413 |
Exercise price of common stock (USD per share) |  | $ 3.52 |  |  | $ 3.52 |  | $ 3.52 |
Estimated proceeds from issuance of warrants |  |  |  |  | $ 4,500 |  |  |
Amount paid for placement agent commissions |  |  | $ 360 |  |  |  |  |
Amount paid related to expenses for registered direct offering and concurrent private placement |  |  | 42 |  |  |  |  |
Amount paid for clearing fees |  |  | 97 |  |  |  |  |
Offering costs paid on the issuance of common stock and warrants |  |  | 499 |  |  |  |  |
Proceeds from sale of common stock and warrants |  |  | $ 4,000 |  |  |  |  |
December 2021 Private Placement | Pre-Funded Warrants |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Securities called by warrants (in shares) |  |  | 85,228 |  |  |  |  |
Exercise price of common stock (USD per share) |  |  | $ 0.0001 |  |  |  |  |
Warrants issued (in shares) | 85,228 |  |  |  |  |  |  |
December 2021 Private Placement | Warrants |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Securities called by warrants (in shares) |  |  | 1,278,413 |  |  |  |  |
Exercise price of common stock (USD per share) |  |  | $ 3.52 |  |  |  |  |
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 (USD per share) |  | $ 1.30 |  |  | $ 1.30 |  | $ 1.30 |
Securities called by warrants (in shares) |  | 4,071,158 |  |  | 4,071,158 |  | 4,071,158 |
Exercise price of common stock (USD per share) |  | $ 0.86 |  |  | $ 0.86 |  | $ 0.86 |
Estimated proceeds from issuance of warrants |  |  |  |  | $ 3,500 |  |  |
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 |  |  |  |  |  |
Proceeds from sale of common stock and warrants |  | $ 3,200 |  |  |  |  |  |
June 2022 Private Placement | Pre-Funded Warrants |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Securities called by warrants (in shares) |  | 1,378,848 |  |  | 1,378,848 |  | 1,378,848 |
Exercise price of common stock (USD per share) |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 |
June 2022 Private Placement | Warrants |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Securities called by warrants (in shares) |  | 2,692,310 |  |  | 2,692,310 |  | 2,692,310 |
Exercise price of common stock (USD per share) |  | $ 1.30 |  |  | $ 1.30 |  | $ 1.30 |

X
- Definition Class Of Warrant Or Right, Warrants Issued + References No definition available. + Details
Name: | efoi_ClassOfWarrantOrRightWarrantsIssued
Namespace Prefix: | efoi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated Proceeds From Issuance Of Warrants + References No definition available. + Details
Name: | efoi_EstimatedProceedsFromIssuanceOfWarrants
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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_December2021PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=efoi_PreFundedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=us-gaap_WarrantMember
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: |