$EFOI
ENERGY FOCUS, INC/DE Stock $efoi

$efoi Overview Financials Valuation SEC Filings Company Website

2021 Q3 Form 10-Q Financial Statement

#000092416821000051 Filed on November 12, 2021

Income Statement

Concept	2021 Q3	2020 Q4	2020 Q3
Revenue	$2.749M	$3.746M	$5.964M
YoY Change	-53.91%	6.09%	104.6%
Cost Of Revenue	$2.186M	$2.310M	$4.588M
YoY Change	-52.35%	-10.12%	143.14%
Gross Profit	$563.0K	$1.434M	$1.376M
YoY Change	-59.08%	49.84%	33.85%
Gross Profit Margin	20.48%	38.28%	23.07%
Selling, General & Admin	$1.968M	$1.900M	$2.003M
YoY Change	-1.75%	-1.55%	18.59%
% of Gross Profit	349.56%	132.5%	145.57%
Research & Development	$404.0K	$420.0K	$401.0K
YoY Change	0.75%	68.0%	109.95%
% of Gross Profit	71.76%	29.29%	29.14%
Depreciation & Amortization	$43.00K	$40.00K	$48.00K
YoY Change	-10.42%	-20.0%	-37.66%
% of Gross Profit	7.64%	2.79%	3.49%
Operating Expenses	$2.373M	$2.320M	$2.388M
YoY Change	-0.63%	6.42%	28.32%
Operating Profit	-$1.810M	-$886.0K	-$1.012M
YoY Change	78.85%	-27.56%	21.49%
Interest Expense	$177.0K	$1.050M	$124.0K
YoY Change	42.74%	-683.33%	85.07%
% of Operating Profit
Other Income/Expense, Net	-$15.00K	-$10.00K	-$25.00K
YoY Change	-40.0%	-120.0%	-45.65%
Pretax Income	-$1.140M	$60.00K	-$1.170M
YoY Change	-2.56%	-104.62%	23.16%
Income Tax	$0.00	$0.00	-$2.000K
% Of Pretax Income		0.0%
Net Earnings	-$1.140M	$65.00K	-$1.165M
YoY Change	-2.15%	-104.97%	23.15%
Net Earnings / Revenue	-41.47%	1.74%	-19.53%
Basic Earnings Per Share	-$0.22	$0.01	-$0.35
Diluted Earnings Per Share	-$0.22	$0.01	-$0.35
COMMON SHARES
Basic Shares Outstanding	5.086M shares	3.491M shares	3.308M shares
Diluted Shares Outstanding	5.086M shares	4.307M shares	3.308M shares

Balance Sheet

Concept	2021 Q3	2020 Q4	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.294M	$2.630M	$2.570M
YoY Change	-49.65%	651.43%	307.94%
Cash & Equivalents	$381.0K	$1.836M	$2.574M
Short-Term Investments	$913.0K	$800.0K
Other Short-Term Assets	$1.421M	$1.000K	$1.360M
YoY Change	4.49%	-99.79%	112.5%
Inventory	$7.755M	$5.641M	$5.259M
Prepaid Expenses
Receivables	$1.628M	$2.021M	$3.366M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$12.10M	$11.08M	$12.56M
YoY Change	-3.68%	18.66%	20.11%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.007M	$420.0K	$420.0K
YoY Change	139.76%	7.97%	12.0%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$0.00	$0.00	$3.000K
YoY Change	-100.0%	-100.0%	-98.54%
Total Long-Term Assets	$1.007M	$1.321M	$1.507M
YoY Change	-33.18%	-45.07%	-36.44%
TOTAL ASSETS
Total Short-Term Assets	$12.10M	$11.08M	$12.56M
Total Long-Term Assets	$1.007M	$1.321M	$1.507M
Total Assets	$13.11M	$12.40M	$14.07M
YoY Change	-6.84%	5.61%	9.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.606M	$2.477M	$3.089M
YoY Change	-15.64%	84.85%	151.55%
Accrued Expenses	$1.696M	$1.412M	$2.070M
YoY Change	-18.07%	39.53%	25.45%
Deferred Revenue	$2.000K	$72.00K
YoY Change
Short-Term Debt	$2.666M	$2.300M	$2.030M
YoY Change	31.33%	-4.96%	-32.33%
Long-Term Debt Due	$1.603M	$530.0K	$560.0K
YoY Change	186.25%	-40.45%
Total Short-Term Liabilities	$8.573M	$7.557M	$11.02M
YoY Change	-22.22%	15.52%	76.58%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$270.0K	$430.0K
YoY Change	-100.0%	145.45%	4200.0%
Other Long-Term Liabilities	$30.00K	$0.00	$0.00
YoY Change		-100.0%	-100.0%
Total Long-Term Liabilities	$30.00K	$0.00	$0.00
YoY Change		-100.0%	-100.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$8.573M	$7.557M	$11.02M
Total Long-Term Liabilities	$30.00K	$0.00	$0.00
Total Liabilities	$8.603M	$8.142M	$11.93M
YoY Change	-27.88%	5.15%	57.2%
SHAREHOLDERS EQUITY
Retained Earnings	-$136.1M	-$130.9M	-$130.9M
YoY Change	3.96%	4.79%	5.95%
Common Stock	$140.6M	$135.1M	$133.1M
YoY Change	5.68%	4.84%	3.3%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.502M	$4.255M	$2.139M
YoY Change
Total Liabilities & Shareholders Equity	$13.11M	$12.40M	$14.07M
YoY Change	-6.84%	5.61%	9.66%

Cashflow Statement

Concept	2021 Q3	2020 Q4	2020 Q3
OPERATING ACTIVITIES
Net Income	-$1.140M	$65.00K	-$1.165M
YoY Change	-2.15%	-104.97%	23.15%
Depreciation, Depletion And Amortization	$43.00K	$40.00K	$48.00K
YoY Change	-10.42%	-20.0%	-37.66%
Cash From Operating Activities	-$2.315M	-$870.0K	-$880.0K
YoY Change	163.07%	200.0%	-27.27%
INVESTING ACTIVITIES
Capital Expenditures	$100.0K	-$50.00K	$53.00K
YoY Change	88.68%	-28.57%	-276.67%
Acquisitions
YoY Change
Other Investing Activities		$0.00
YoY Change
Cash From Investing Activities	-$100.0K	-$50.00K	-$53.00K
YoY Change	88.68%	-28.57%	76.67%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$1.127M	180.0K	$780.0K
YoY Change	44.49%	-55.0%	-336.36%
NET CHANGE
Cash From Operating Activities	-$2.315M	-870.0K	-$880.0K
Cash From Investing Activities	-$100.0K	-50.00K	-$53.00K
Cash From Financing Activities	$1.127M	180.0K	$780.0K
Net Change In Cash	-$1.288M	-740.0K	-$153.0K
YoY Change	741.83%	-1950.0%	-90.25%
FREE CASH FLOW
Cash From Operating Activities	-$2.315M	-$870.0K	-$880.0K
Capital Expenditures	$100.0K	-$50.00K	$53.00K
Free Cash Flow	-$2.415M	-$820.0K	-$933.0K
YoY Change	158.84%	272.73%	-20.93%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000924168
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Registrant Name EntityRegistrantName	ENERGY FOCUS, INC/DE
CY2020Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	0.2
CY2020Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	0.2
CY2020Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	0.2
CY2020Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	0.2
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-36583
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-3021850
	dei	Entity Address Address Line1 EntityAddressAddressLine1	32000 Aurora Road
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite B
	dei	Entity Address City Or Town EntityAddressCityOrTown	Solon
	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	44139
	dei	City Area Code CityAreaCode	(440)
	dei	Local Phone Number LocalPhoneNumber	715-1300
	dei	Security12b Title Security12bTitle	Common Stock, par value $0.0001 per share
	dei	Trading Symbol TradingSymbol	EFOI
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	true
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	5087574	shares
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CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1836000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	18000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8000	USD
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CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2021000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	7755000	USD
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CY2021Q3	us-gaap	Standard Product Warranty Accrual Current StandardProductWarrantyAccrualCurrent	240000	USD
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CY2021Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	2000	USD
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CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	30000	USD
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-1140000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-1165000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-5255000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-6046000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.22
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.22
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.35
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.35
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.22
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.22
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.89
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.89
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	5086000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	5086000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	3308000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	3308000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	4309000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	4309000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	3196000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	3196000	shares
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-1140000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-1165000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-5255000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-6046000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1140000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1165000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-5255000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-4340000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	1714000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-6046000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	4255000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	0	USD
CY2021Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	527000	USD
CY2021Q1	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	140000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1642000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	3278000	USD
CY2021Q2	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	59000	USD
CY2021Q2	us-gaap	Stock And Warrants Issued During Period Value Preferred Stock And Warrants StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants	5000000	USD
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	469000	USD
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	208000	USD
CY2021Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-2473000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	5603000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	0	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	1000	USD
	us-gaap	Depreciation Depreciation	143000	USD
	us-gaap	Depreciation Depreciation	140000	USD
CY2021Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	-1000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	39000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1140000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	4502000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	3996000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	0	USD
CY2020Q1	us-gaap	Stock And Warrants Issued During Period Value Preferred Stock And Warrants StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants	2749000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	474000	USD
CY2020Q1	efoi	Adjustments To Additional Paid In Capital Warrant Liability AdjustmentsToAdditionalPaidInCapitalWarrantLiability	1636000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	20000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-541000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	5883000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	30000	USD
CY2020Q2	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	3000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	103000	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	41000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	0	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1555000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	35000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1165000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	2139000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1140000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1165000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-5255000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-6046000	USD
CY2021Q3	efoi	Gain Loss From Employee Retention Tax Credit GainLossFromEmployeeRetentionTaxCredit	862000	USD
CY2020Q3	efoi	Gain Loss From Employee Retention Tax Credit GainLossFromEmployeeRetentionTaxCredit	0	USD
	efoi	Gain Loss From Employee Retention Tax Credit GainLossFromEmployeeRetentionTaxCredit	862000	USD
	efoi	Gain Loss From Employee Retention Tax Credit GainLossFromEmployeeRetentionTaxCredit	0	USD
CY2021Q3	efoi	Gain Loss On Forgiveness Of Debt GainLossOnForgivenessOfDebt	0	USD
CY2020Q3	efoi	Gain Loss On Forgiveness Of Debt GainLossOnForgivenessOfDebt	0	USD
	efoi	Gain Loss On Forgiveness Of Debt GainLossOnForgivenessOfDebt	801000	USD
	efoi	Gain Loss On Forgiveness Of Debt GainLossOnForgivenessOfDebt	0	USD
CY2021Q3	us-gaap	Depreciation Depreciation	43000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	48000	USD
CY2021Q3	us-gaap	Share Based Compensation ShareBasedCompensation	39000	USD
CY2020Q3	us-gaap	Share Based Compensation ShareBasedCompensation	35000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	387000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	96000	USD
CY2021Q3	us-gaap	Fair Value Adjustment Of Warrants FairValueAdjustmentOfWarrants	0	USD
CY2020Q3	us-gaap	Fair Value Adjustment Of Warrants FairValueAdjustmentOfWarrants	-153000	USD
	us-gaap	Fair Value Adjustment Of Warrants FairValueAdjustmentOfWarrants	0	USD
	us-gaap	Fair Value Adjustment Of Warrants FairValueAdjustmentOfWarrants	2274000	USD
CY2021Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2000	USD
CY2020Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-9000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-21000	USD
CY2021Q3	us-gaap	Inventory Write Down InventoryWriteDown	-70000	USD
CY2020Q3	us-gaap	Inventory Write Down InventoryWriteDown	90000	USD
	us-gaap	Inventory Write Down InventoryWriteDown	-9000	USD
	us-gaap	Inventory Write Down InventoryWriteDown	-229000	USD
CY2021Q3	efoi	Increase Decrease In Provision For Warranties IncreaseDecreaseInProvisionForWarranties	1000	USD
CY2020Q3	efoi	Increase Decrease In Provision For Warranties IncreaseDecreaseInProvisionForWarranties	14000	USD
	efoi	Increase Decrease In Provision For Warranties IncreaseDecreaseInProvisionForWarranties	34000	USD
CY2021Q3	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-61000	USD
	efoi	Increase Decrease In Provision For Warranties IncreaseDecreaseInProvisionForWarranties	13000	USD
CY2020Q3	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-145000	USD
	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-158000	USD
	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-221000	USD
CY2021Q3	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	500000	USD
CY2020Q3	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	901000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-390000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1070000	USD
CY2021Q3	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-444000	USD
CY2020Q3	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-551000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2105000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1138000	USD
CY2021Q3	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	62000	USD
CY2020Q3	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	197000	USD
	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-87000	USD
	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	412000	USD
CY2021Q3	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	91000	USD
CY2020Q3	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	76000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	119000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	59000	USD
CY2021Q3	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-164000	USD
CY2020Q3	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	534000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-82000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1811000	USD
CY2021Q3	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	53000	USD
CY2020Q3	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	160000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-305000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	453000	USD
CY2021Q3	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-69000	USD
CY2020Q3	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	44000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-70000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	87000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-3165000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	4463000	USD
CY2021Q3	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-1175000	USD
CY2020Q3	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	285000	USD
CY2021Q3	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-2315000	USD
CY2020Q3	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-880000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-8420000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-1583000	USD
CY2021Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	100000	USD
CY2020Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	53000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	311000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	171000	USD
CY2021Q3	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-100000	USD
CY2020Q3	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-53000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-311000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-171000	USD
CY2021Q3	efoi	Proceeds From Payments For Issuance Of Common Stock And Warrants ProceedsFromPaymentsForIssuanceOfCommonStockAndWarrants	0	USD
CY2020Q3	efoi	Proceeds From Payments For Issuance Of Common Stock And Warrants ProceedsFromPaymentsForIssuanceOfCommonStockAndWarrants	-1000	USD
	efoi	Proceeds From Payments For Issuance Of Common Stock And Warrants ProceedsFromPaymentsForIssuanceOfCommonStockAndWarrants	5000000	USD
	efoi	Proceeds From Payments For Issuance Of Common Stock And Warrants ProceedsFromPaymentsForIssuanceOfCommonStockAndWarrants	2749000	USD
CY2021Q3	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	0	USD
CY2020Q3	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	625000	USD
	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	527000	USD
	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	676000	USD
CY2021Q3	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1000	USD
CY2020Q3	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	470000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	474000	USD
CY2021Q3	efoi	Proceeds From Paycheck Protection Program ProceedsFromPaycheckProtectionProgram	0	USD
CY2020Q3	efoi	Proceeds From Paycheck Protection Program ProceedsFromPaycheckProtectionProgram	0	USD
	efoi	Proceeds From Paycheck Protection Program ProceedsFromPaycheckProtectionProgram	0	USD
	efoi	Proceeds From Paycheck Protection Program ProceedsFromPaycheckProtectionProgram	795000	USD
CY2021Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1000	USD
CY2020Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3000	USD
CY2021Q3	efoi	Proceeds From Stock Options Exercised And Employee Stock Purchase Plans ProceedsFromStockOptionsExercisedAndEmployeeStockPurchasePlans	0	USD
CY2020Q3	efoi	Proceeds From Stock Options Exercised And Employee Stock Purchase Plans ProceedsFromStockOptionsExercisedAndEmployeeStockPurchasePlans	0	USD
	efoi	Proceeds From Stock Options Exercised And Employee Stock Purchase Plans ProceedsFromStockOptionsExercisedAndEmployeeStockPurchasePlans	59000	USD
	efoi	Proceeds From Stock Options Exercised And Employee Stock Purchase Plans ProceedsFromStockOptionsExercisedAndEmployeeStockPurchasePlans	30000	USD
CY2021Q3	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	-1000	USD
CY2020Q3	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	0	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3000	USD
CY2021Q3	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2020Q3	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	1515000	USD
	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2021Q3	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
CY2020Q3	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	450000	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	976000	USD
CY2021Q3	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2020Q3	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	320000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	30000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	320000	USD
CY2021Q3	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2020Q3	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1296000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	719000	USD
CY2021Q3	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1128000	USD
CY2020Q3	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2223000	USD
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	337000	USD
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2223000	USD
CY2021Q3	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1127000	USD
CY2020Q3	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	780000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	6934000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3978000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1288000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-153000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1797000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2224000	USD
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1669000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3069000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2178000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	692000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	381000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2916000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	381000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2916000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	381000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2574000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	381000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2574000	USD
CY2021Q3	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	342000	USD
CY2021Q3	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	342000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	381000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2916000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	381000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2916000	USD
	us-gaap	Nature Of Operations NatureOfOperations	NATURE OF<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">OPERATIONS</span><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Energy Focus, Inc. engages primarily in the design, development, manufacturing, marketing and sale of energy-efficient lighting systems and controls and development of ultraviolet-C light disinfection (“UVCD”) products. We develop, market and sell high quality light-emitting diode (“LED”) lighting and controls products and UVCD products in the commercial market and military maritime market (“MMM”), and expect to expand our offerings into the consumer market starting in the fourth quarter of 2021. Our mission is to enable our customers to run their facilities, offices and homes with greater energy efficiency, productivity, and human health through advanced LED retrofit and UVCD solutions. Our goal is to be the LED and human-centric lighting (“HCL”) technology and market leader for the most demanding applications where performance, quality, value, environmental impact and health are considered paramount. We specialize in LED lighting retrofit by replacing fluorescent, high-intensity discharge lighting and other types of lamps in institutional buildings for primarily indoor lighting applications with our innovative, high-quality commercial and military tubular LED (“TLED”) products, as well as other LED and lighting control products for commercial and consumer applications. In late 2020, we announced the launch of our UVCD product portfolio, which is being brought to market throughout the fourth quarter of 2021 and into 2022.</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">On June 11, 2020, in accordance with previous stockholder approval, our board of directors effected a 1-for-5 (the “Split Ratio”) reverse stock split of the Company’s common stock, par value $0.0001 per share. The reverse stock split became effective immediately upon the filing of the Certificate of Amendment to the Company’s Certificate of Incorporation, as amended (the “Certificate of Incorporation”), with the Delaware Secretary of State (the “Effective Time”). At the Effective Time, every five shares of common stock issued and outstanding automatically combined into one validly issued, fully paid and non-assessable share of common stock. No fractional shares were issued as a result of the reverse stock split. The $0.0001 par value per share of common stock and other terms of the common stock were not affected by the reverse stock split. The number of authorized shares of common stock under the Certificate of Incorporation remained unchanged at 50,000,000 shares. Proportional adjustments were made to the conversion and exercise prices of our outstanding warrants and stock options, and to the number of shares issued and issuable under our stock incentive plans in connection with the reverse stock split. The information presented in the financial statements for all prior periods have been retroactively adjusted to reflect the reverse stock split. Preferred shares outstanding were not affected by the reverse stock split and, as such, those shares have not been adjusted.</span></div>
CY2020Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2020Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2020Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q3	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	11000	USD
	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of estimates</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in our financial statements and accompanying notes. Management bases its estimates on historical experience and various other assumptions believed to be reasonable. Although these estimates are based on management’s best knowledge of current events and actions that may impact us in the future, actual results may vary from the estimates. Estimates include, but are not limited to, the establishment of reserves for accounts receivable, sales returns, inventory obsolescence and warranty claims; the useful lives of property and equipment; valuation allowance for net deferred taxes; the cost and offsetting income related to sub-leased property; and stock-based compensation. In addition, estimates and assumptions associated with the determination of the fair value of financial instruments and evaluation of long-lived assets for impairment requires considerable judgment. Actual results could differ from those estimates and such differences could be material.</span></div>
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Certain risks and concentrations</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We have certain customers whose net sales individually represented 10% or more of our total net sales, or whose net trade accounts receivable balance individually represented 10% or more of our total net trade accounts receivable; we have certain suppliers, which individually represent 10% or more of our total purchases, or whose trade accounts payable balance individually represented 10% or more of our total trade accounts payable balance, as follows:</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">For the three months ended September 30, 2021, sales to our primary distributor for the U.S. Navy, a U.S. Navy shipbuilder, and a regional commercial lighting retrofit company accounted for approximately 19%, 17%, and 27% of net sales, respectively. When sales to our primary distributor for the U.S. Navy are combined with sales to shipbuilders for the U.S. Navy, total net sales of products for the U.S. Navy comprised approximately 36% of net sales for the same period. For the three months ended September 30, 2020, sales to our primary distributor for the U.S. Navy and a regional commercial lighting retrofit company accounted for approximately 67% and 12% of net sales, respectively. When sales to our primary distributor for the U.S. Navy are combined with sales to shipbuilders for the U.S. Navy, total net sales of products for the U.S. Navy comprised approximately 68% of net sales for the same period.</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">For the nine months ended September 30, 2021, sales to our primary distributor for the U.S. Navy, a U.S. Navy shipbuilder, and a regional commercial lighting retrofit company accounted for approximately 33%, 10%, and 17% of net sales, respectively. When sales to our primary distributor for the U.S. Navy are combined with sales to shipbuilders for the U.S. Navy, total net sales of products for the U.S. Navy comprised approximately 43% of net sales for the same period. For the nine months ended September 30, 2020, sales to our primary distributor for the U.S. Navy and a regional commercial lighting retrofit company accounted for approximately 52% and 14% of net sales, respectively. When sales to our primary distributor for the U.S. Navy are combined with sales to shipbuilders for the U.S. Navy, total net sales of products for the U.S. Navy comprised approximately 58% of net sales for the same period.</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Our primary distributor for the U.S. Navy, a regional commercial lighting retrofit company and a U.S. Navy shipbuilder accounted for approximately 12%, 34%, and 27% of net trade accounts receivable, respectively, at September 30, 2021. At December 31, 2020, our primary distributor to the U.S. Navy accounted for 28% of our net trade accounts receivable and a shipbuilder for the U.S. Navy accounted for 21% of our net trade accounts receivable. </span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">One offshore supplier accounted for approximately 19% and 30%, respectively, of our total expenditures for the three and nine months ended September 30, 2021. For the three months ended September 30, 2020, two offshore suppliers accounted for approximately 25% and 20%, respectively, of total expenditures. These same two suppliers accounted for approximately 19% and 14%, respectively, of total expenditures for the nine months ended September 30, 2020.</span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">At September 30, 2021, one offshore supplier accounted for approximately 63% of our trade accounts payable balance. At December 31, 2020, this offshore supplier accounted for approximately 44% of our trade accounts payable balance.</span></div>
CY2021Q3	us-gaap	Revenues Revenues	2749000	USD
CY2020Q3	us-gaap	Revenues Revenues	5964000	USD
	us-gaap	Revenues Revenues	7460000	USD
	us-gaap	Revenues Revenues	13082000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-1140000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-1165000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-5255000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-6046000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	5086000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	5086000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	3308000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	3308000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	4309000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	4309000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	3196000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	3196000	shares
CY2021Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	239000	USD
CY2020Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	215000	USD
CY2020Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	227000	USD
CY2019Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	195000	USD
CY2021Q3	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	10000	USD
CY2020Q3	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	22000	USD
	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	49000	USD
	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	29000	USD
CY2021Q3	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	4000	USD
CY2020Q3	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	4000	USD
	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	16000	USD
	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	23000	USD
CY2021Q3	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	13000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	52000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	17000	USD
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	240000	USD
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	230000	USD
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	240000	USD
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	230000	USD
CY2021Q2	efoi	Payments For Clearing Fees PaymentsForClearingFees	19000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	470000	USD
CY2021Q2	efoi	Proceeds From The Issuance Of Common Stock And Warrants Net Of Issuance Costs ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts	4500000	USD
CY2020Q1	efoi	Payments For Clearing Fees PaymentsForClearingFees	231000	USD
CY2020	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	510000	USD
CY2020Q1	efoi	Proceeds From The Issuance Of Common Stock And Warrants Net Of Issuance Costs ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts	2300000	USD
CY2020Q1	efoi	Debt Instrument Proceeds To Be Paid To Lender Percent DebtInstrumentProceedsToBePaidToLenderPercent	0.10
CY2020Q1	efoi	Debt Instrument Proceeds To Be Paid To Lender Percent DebtInstrumentProceedsToBePaidToLenderPercent	0.10
CY2020Q1	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	275000	USD
	efoi	Class Of Warrant Or Right Warrants Issued ClassOfWarrantOrRightWarrantsIssued	310860	shares
CY2021Q3	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	3.59
	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	527000	USD
	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	1100000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Exercised ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised	156446	shares
CY2019Q4	us-gaap	Other Deferred Compensation Arrangements Liability Current OtherDeferredCompensationArrangementsLiabilityCurrent	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues	1636000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	982000	USD
	us-gaap	Fair Value Adjustment Of Warrants FairValueAdjustmentOfWarrants	2274000	USD
CY2020Q3	us-gaap	Other Deferred Compensation Arrangements Liability Current OtherDeferredCompensationArrangementsLiabilityCurrent	2928000	USD
	us-gaap	Restructuring Costs RestructuringCosts	-21000	USD
CY2020Q3	us-gaap	Restructuring Costs RestructuringCosts	-16000	USD
	us-gaap	Restructuring Costs RestructuringCosts	-44000	USD
CY2021Q2	efoi	Proceeds From The Issuance Of Common Stock And Warrants Net Of Issuance Costs ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts	4500000	USD
CY2020Q1	efoi	Proceeds From The Issuance Of Common Stock And Warrants Net Of Issuance Costs ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts	2300000	USD
CY2021Q2	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	1500000	USD
CY2020Q3	efoi	Debt Instrument Number Of Credit Facilities DebtInstrumentNumberOfCreditFacilities	2	creditFacility
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	1714000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	4255000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	4502000	USD
CY2021Q3	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	4232000	USD
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	2695000	USD
CY2021Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	6409000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	5840000	USD
CY2021Q3	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	2886000	USD
CY2020Q4	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	2894000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	7755000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	5641000	USD
CY2021Q2	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	2956000	USD
CY2020Q2	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	3326000	USD
CY2020Q4	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	2894000	USD
CY2019Q4	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	3645000	USD
CY2021Q3	efoi	Inventory Valuation Reserves Provision Accrual InventoryValuationReservesProvisionAccrual	34000	USD
CY2020Q3	efoi	Inventory Valuation Reserves Provision Accrual InventoryValuationReservesProvisionAccrual	-187000	USD
	efoi	Inventory Valuation Reserves Provision Accrual InventoryValuationReservesProvisionAccrual	-64000	USD
	efoi	Inventory Valuation Reserves Provision Accrual InventoryValuationReservesProvisionAccrual	-75000	USD
CY2021Q3	efoi	Inventory Valuation Reserves Sales Of Inventory InventoryValuationReservesSalesOfInventory	36000	USD
CY2020Q3	efoi	Inventory Valuation Reserves Sales Of Inventory InventoryValuationReservesSalesOfInventory	121000	USD
	efoi	Inventory Valuation Reserves Sales Of Inventory InventoryValuationReservesSalesOfInventory	72000	USD
	efoi	Inventory Valuation Reserves Sales Of Inventory InventoryValuationReservesSalesOfInventory	288000	USD
CY2021Q3	efoi	Inventory Valuation Reserves Write Offs InventoryValuationReservesWriteOffs	0	USD
CY2020Q3	efoi	Inventory Valuation Reserves Write Offs InventoryValuationReservesWriteOffs	-23000	USD
	efoi	Inventory Valuation Reserves Write Offs InventoryValuationReservesWriteOffs	0	USD
	efoi	Inventory Valuation Reserves Write Offs InventoryValuationReservesWriteOffs	17000	USD
CY2021Q3	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	2886000	USD
CY2020Q3	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	3415000	USD
CY2021Q3	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	2886000	USD
CY2020Q3	efoi	Inventory Valuation Reserves Raw Materials InventoryValuationReservesRawMaterials	3415000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	13000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	13000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	3345000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	3084000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	2757000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	2664000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	588000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	420000	USD
CY2021Q3	us-gaap	Depreciation Depreciation	43000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	48000	USD
	us-gaap	Depreciation Depreciation	143000	USD
	us-gaap	Depreciation Depreciation	140000	USD
CY2021Q1	efoi	Lessee Operating Lease Interest Rate Effective Rate LesseeOperatingLeaseInterestRateEffectiveRate	0.1593
CY2021Q3	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.0725
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P1Y4M24D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P0Y7M6D
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	300000	USD
CY2021Q3	us-gaap	Sublease Income SubleaseIncome	25000	USD
CY2020Q3	us-gaap	Sublease Income SubleaseIncome	26000	USD
	us-gaap	Sublease Income SubleaseIncome	87000	USD
	us-gaap	Sublease Income SubleaseIncome	80000	USD
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	139000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	148000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	423000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	451000	USD
CY2021Q3	efoi	Operating Lease Cost Net Of Sublease Income OperatingLeaseCostNetOfSubleaseIncome	114000	USD
CY2020Q3	efoi	Operating Lease Cost Net Of Sublease Income OperatingLeaseCostNetOfSubleaseIncome	122000	USD
	efoi	Operating Lease Cost Net Of Sublease Income OperatingLeaseCostNetOfSubleaseIncome	336000	USD
	efoi	Operating Lease Cost Net Of Sublease Income OperatingLeaseCostNetOfSubleaseIncome	371000	USD
CY2021Q3	efoi	Restructured Lease Sublease Income RestructuredLeaseSubleaseIncome	0	USD
CY2020Q3	efoi	Restructured Lease Sublease Income RestructuredLeaseSubleaseIncome	68000	USD
	efoi	Restructured Lease Sublease Income RestructuredLeaseSubleaseIncome	136000	USD
	efoi	Restructured Lease Sublease Income RestructuredLeaseSubleaseIncome	204000	USD
CY2021Q3	efoi	Restructured Lease Operating Lease Cost RestructuredLeaseOperatingLeaseCost	0	USD
CY2020Q3	efoi	Restructured Lease Operating Lease Cost RestructuredLeaseOperatingLeaseCost	59000	USD
CY2020Q4	efoi	Restructured Operating Lease Right Of Use Asset RestructuredOperatingLeaseRightOfUseAsset	107000	USD
	efoi	Restructured Lease Operating Lease Cost RestructuredLeaseOperatingLeaseCost	109000	USD
	efoi	Restructured Lease Operating Lease Cost RestructuredLeaseOperatingLeaseCost	180000	USD
CY2021Q3	efoi	Restructured Lease Operating Lease Cost Net Of Sublease Income RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome	0	USD
CY2020Q3	efoi	Restructured Lease Operating Lease Cost Net Of Sublease Income RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome	-9000	USD
	efoi	Restructured Lease Operating Lease Cost Net Of Sublease Income RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome	-27000	USD
	efoi	Restructured Lease Operating Lease Cost Net Of Sublease Income RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome	-24000	USD
CY2021Q3	us-gaap	Lease Cost LeaseCost	114000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	113000	USD
	us-gaap	Lease Cost LeaseCost	309000	USD
	us-gaap	Lease Cost LeaseCost	347000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	419000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	794000	USD
CY2021Q3	efoi	Restructured Operating Lease Right Of Use Asset RestructuredOperatingLeaseRightOfUseAsset	0	USD
CY2021Q3	efoi	Operating Lease Right Of Use Asset Including Restructured Leases OperatingLeaseRightOfUseAssetIncludingRestructuredLeases	419000	USD
CY2020Q4	efoi	Operating Lease Right Of Use Asset Including Restructured Leases OperatingLeaseRightOfUseAssetIncludingRestructuredLeases	901000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	505000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	916000	USD
CY2021Q3	efoi	Restructured Operating Lease Liability RestructuredOperatingLeaseLiability	0	USD
CY2020Q4	efoi	Restructured Operating Lease Liability RestructuredOperatingLeaseLiability	168000	USD
CY2021Q3	efoi	Operating Lease Liability Including Restructured Leases OperatingLeaseLiabilityIncludingRestructuredLeases	505000	USD
CY2020Q4	efoi	Operating Lease Liability Including Restructured Leases OperatingLeaseLiabilityIncludingRestructuredLeases	1084000	USD
CY2021Q3	efoi	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	13000	USD
CY2020Q4	efoi	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	13000	USD
CY2021Q3	efoi	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	11000	USD
CY2020Q4	efoi	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	9000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	4000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	1000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	4000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	1000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	4000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	488000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	1000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	19000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	8000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	3000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	2000	USD
	efoi	Restructured Leases Operating Lease Payments RestructuredLeasesOperatingLeasePayments	52000	USD
CY2021Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	520000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	1000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	15000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	505000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	1000	USD
CY2021Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	161000	USD
CY2020Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	134000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	421000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	401000	USD
CY2021Q3	efoi	Restructured Leases Operating Lease Payments RestructuredLeasesOperatingLeasePayments	0	USD
CY2020Q3	efoi	Restructured Leases Operating Lease Payments RestructuredLeasesOperatingLeasePayments	17000	USD
	efoi	Restructured Leases Operating Lease Payments RestructuredLeasesOperatingLeasePayments	35000	USD
CY2020Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3000	USD
CY2020Q3	efoi	Debt Instrument Number Of Credit Facilities DebtInstrumentNumberOfCreditFacilities	2	creditFacility
CY2020Q4	efoi	Payment Protection Program Current PaymentProtectionProgramCurrent	529000	USD
CY2020Q4	efoi	Payment Protection Program Noncurrent PaymentProtectionProgramNoncurrent	266000	USD
CY2020Q1	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	275000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	7100000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	8300000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration	37300000	USD
CY2021Q2	efoi	Payments For Clearing Fees PaymentsForClearingFees	19000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	470000	USD
CY2020Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q1	efoi	Payments For Clearing Fees PaymentsForClearingFees	231000	USD
CY2020Q1	efoi	Percentage Of Series A Preferred Stock Eligible To Vote PercentageOfSeriesAPreferredStockEligibleToVote	0.1107
CY2020Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2020Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2021Q2	efoi	Proceeds From The Issuance Of Common Stock And Warrants Net Of Issuance Costs ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts	4500000	USD
CY2019Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2020	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	510000	USD
CY2020Q1	efoi	Proceeds From The Issuance Of Common Stock And Warrants Net Of Issuance Costs ProceedsFromTheIssuanceOfCommonStockAndWarrantsNetOfIssuanceCosts	2300000	USD
CY2020Q1	efoi	Debt Instrument Proceeds To Be Paid To Lender Percent DebtInstrumentProceedsToBePaidToLenderPercent	0.10
CY2020Q1	efoi	Debt Instrument Proceeds To Be Paid To Lender Percent DebtInstrumentProceedsToBePaidToLenderPercent	0.10
CY2020Q1	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	275000	USD
	efoi	Class Of Warrant Or Right Warrants Issued ClassOfWarrantOrRightWarrantsIssued	310860	shares
CY2021Q3	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	3.59
	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	1100000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Exercised ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised	156446	shares
	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	527000	USD
	efoi	Class Of Warrant Or Right Warrants Issued ClassOfWarrantOrRightWarrantsIssued	310860	shares
	efoi	Class Of Warrant Or Right Warrants Issued ClassOfWarrantOrRightWarrantsIssued	539152	shares
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	39000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	35000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	387000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	96000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	300000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	200000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y10M24D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice	5.39
CY2021Q3	us-gaap	Share Price SharePrice	4.18
CY2020Q3	us-gaap	Share Price SharePrice	2.00
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice	2.61
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y2M12D
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y2M12D
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.008
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.007
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.965
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.935
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	221450	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	3.45
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	76900	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	5.39
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	35287	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	5.43
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	1500	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	53.50
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	257338	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	3.49
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y4M24D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	218795	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	3.43
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P8Y3M18D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	78156	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	3.48
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P7Y9M18D
CY2021Q3	us-gaap	Purchase Obligation PurchaseObligation	2900000	USD
CY2021Q3	efoi	Payroll Tax Credit Employee Retention Credit Under The Cares Act PayrollTaxCreditEmployeeRetentionCreditUnderTheCARESAct	431000	USD
CY2021Q2	efoi	Payroll Tax Credit Employee Retention Credit Under The Cares Act PayrollTaxCreditEmployeeRetentionCreditUnderTheCARESAct	431000	USD
CY2020Q4	efoi	Payment Protection Program Current PaymentProtectionProgramCurrent	529000	USD
CY2020Q4	efoi	Payment Protection Program Noncurrent PaymentProtectionProgramNoncurrent	266000	USD

Files In Submission

Name	View Source	Status
0000924168-21-000051-index-headers.html	Edgar Link	pending
0000924168-21-000051-index.html	Edgar Link	pending
0000924168-21-000051.txt	Edgar Link	pending
0000924168-21-000051-xbrl.zip	Edgar Link	pending
a20210930exhibit31110-q.htm	Edgar Link	pending
a20210930exhibit31210-q.htm	Edgar Link	pending
a20210930exhibit32110-q.htm	Edgar Link	pending
efoi-20210930.htm	Edgar Link	pending
efoi-20210930.xsd	Edgar Link	pending
efoi-20210930_cal.xml	Edgar Link	unprocessable
efoi-20210930_def.xml	Edgar Link	unprocessable
efoi-20210930_htm.xml	Edgar Link	completed
efoi-20210930_lab.xml	Edgar Link	unprocessable
efoi-20210930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
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R5.htm	Edgar Link	pending
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R64.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$EFOI
ENERGY FOCUS, INC/DE Stock $efoi

2021 Q3 Form 10-Q Financial Statement

#000092416821000051 Filed on November 12, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EFOI ENERGY FOCUS, INC/DE Stock $efoi

2021 Q3 Form 10-Q Financial Statement

#000092416821000051 Filed on November 12, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EFOI
ENERGY FOCUS, INC/DE Stock $efoi