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: