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Equity (Details Narrative) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Nov. 05, 2014
Oct. 23, 2013
Oct. 17, 2013
Feb. 26, 2013
Oct. 31, 2013
Oct. 31, 2011
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jul. 02, 2013
Aug. 20, 2013
Aug. 15, 2012
Nov. 30, 2014
Sep. 11, 2012
Jun. 10, 2010
Common stock, shares issued               26,475,591us-gaap_SharesIssued              
Common stock, shares outstanding               26,475,591us-gaap_CommonStockSharesOutstanding              
Equity issuance price per share               $ 0.01us-gaap_SaleOfStockPricePerShare              
Percentage of voting rights               50.00%ACFN_PercentageOfVotingRights              
Gross proceeds from private placements $ 4,500us-gaap_ProceedsFromIssuanceOfPrivatePlacement                            
Net of transaction costs 4,007ACFN_TransactionCosts                            
Warrants issued 2,142,857ACFN_WarrantsIssued                            
Derivative liability               50us-gaap_DerivativeLiabilities              
Risk free interest rate       1.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate       2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate            
Expected life       7 years 5 years     7 years 6 years 8 months 12 days            
Annual volatility       57.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 62.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate     64.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 59.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate            
Annual dividend rate       2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate           0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate            
Number of stock public offering during period   526,316us-gaap_StockIssuedDuringPeriodSharesNewIssues 3,508,771us-gaap_StockIssuedDuringPeriodSharesNewIssues                        
Proceeds from public offering   1,500us-gaap_ProceedsFromIssuanceInitialPublicOffering 10,000us-gaap_ProceedsFromIssuanceInitialPublicOffering                        
Equity issuance price per share   $ 2.85us-gaap_EquityIssuancePerShareAmount $ 2.85us-gaap_EquityIssuancePerShareAmount                        
Net proceeds of public offering after deduction of offering expenses   1,370ACFN_Netproceedsofpublicofferingafterdeductionofofferingexpenses 9,134ACFN_Netproceedsofpublicofferingafterdeductionofofferingexpenses                        
Related to exercise price of warrants issued   $ 3.14ACFN_RelatedToExercisePriceOfWarrantsIssuedPricePerShare $ 3.14ACFN_RelatedToExercisePriceOfWarrantsIssuedPricePerShare                        
Number of stock issued during period shares dividend reinvestment plan             18,976us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan   18,976us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan            
Transaction cost   129ACFN_TransactionCost                          
Payment of a quarterly dividend price per share           $ 0.035ACFN_PaymentOfQuarterlyDividendPricePerShare                  
Option granted               664,103us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 246,095us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross            
Intrinsic value of options exercised               123us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 144us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue            
Intrinsic value of options exercisable               0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1            
Fair value of each option granted       $ 3.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue       $ 1.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 3.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue            
Stock based compensation expense               865us-gaap_AllocatedShareBasedCompensationExpense 926us-gaap_AllocatedShareBasedCompensationExpense            
Employee service share-based compensation nonvested awards total compensation cost not yet recognized               622us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized              
Weighted average exercise price, Granted               $ 2.14us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 6.06us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice            
Acorn holding upon conversion of preferred shares               888.30%ACFN_HoldingCompanyUponConversionOfPreferredShares              
Fully diluted acorn holding upon conversion of preferred shares               77.40%ACFN_FullyDilutedHoldingCompanyUponConversionOfPreferredShares              
Warrants granted in connection with November 2014 Capital Raise         262,281ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsGrantsInPeriod                    
Weighted average contractual life of warrants period         5 years                    
Warrants exercise price per share         $ 3.14ACFN_InvestmentWarrantsExercisePrice                    
Value of warrants         482us-gaap_WarrantsAndRightsOutstanding     1,641us-gaap_WarrantsAndRightsOutstanding 526us-gaap_WarrantsAndRightsOutstanding            
Discount rate         1.40%ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDiscountRate                    
Warrants exercised                  5,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised            
Warrants forfeited                                
NIS [Member]                              
Weighted average exercise price, Granted               $ 9.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_CurrencyAxis
= ACFN_NisMember		              
Weighted average exercise price of forfeitures               $ 9.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_CurrencyAxis
= ACFN_NisMember		              
DSIT Solutions, Ltd. [Member]                              
Conversion of stock description                

If all the options in the DSIT Plan are exercised, the Company’s holdings in DSIT will be diluted from 88.3% to approximately 77.4% on an as converted basis (see Note 3(d)).

            
Option granted                 6,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= ACFN_DSITSolutionsLtdMember		            
Stock based compensation expense                 160us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= ACFN_DSITSolutionsLtdMember		            
Option exercisable period                 5 years 1 month 6 days            
Grantee achieving period                   25 years          
DSIT Solutions, Ltd. [Member] | NIS [Member]                              
Weighted average exercise price, Granted                 $ 9.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_CurrencyAxis
= ACFN_NisMember
/ dei_LegalEntityAxis
= ACFN_DSITSolutionsLtdMember		            
Selling General and Administrative Expenses [Member]                              
Stock based compensation expense               830us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 927us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		            
Research and Development Expense [Member]                              
Stock based compensation expense               35us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		               
Non-Employee Options [Member] | Selling General and Administrative Expenses [Member]                              
Stock based compensation expense               37us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_NonEmployeeOptionsMember		 42us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_NonEmployeeOptionsMember		            
Employee And Non Employee Option [Member]                              
Weighted average period of Options outstanding               1 year 4 months 24 days              
USSI Stock Option Plan [Member]                              
Stock based compensation expense               79us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember		 133us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember		            
USSI Stock Option Plan [Member] | Selling General and Administrative Expenses [Member]                              
Stock based compensation expense               53us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember		 92us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember		            
USSI Stock Option Plan [Member] | Research and Development Expense [Member]                              
Stock based compensation expense               26us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember		 41us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember		            
Outside Consultant [Member]                              
Risk free interest rate                     2.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_OutsideConsultantMember		        
Expected life                     7 years        
Annual volatility                     57.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_OutsideConsultantMember		        
Annual dividend rate                               
Option granted       25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_OutsideConsultantMember		             20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_OutsideConsultantMember		        
Option excercise price per share       $ 6.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_OutsideConsultantMember		                      
DSIT [Member] | Selling General and Administrative Expenses [Member]                              
Stock based compensation expense                 116us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_DsitMember		            
DSIT [Member] | Cost of Sales [Memebr]                              
Stock based compensation expense               2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_DsitMember		 44us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_DsitMember		            
Dividend Reinvestment Plan [Member]                              
Shares available under DRIP                       600,000ACFN_SharesAvailableUnderDrip
/ us-gaap_PlanNameAxis
= ACFN_DividendReinvestmentPlanMember		      
Percentage of shares issued discount from market price                       5.00%ACFN_PercentageOfSharesIssuedDiscountFromMarketPrice
/ us-gaap_PlanNameAxis
= ACFN_DividendReinvestmentPlanMember		      
2006 Stock Incentive Plan [Member]                              
Increase number of shares available                           1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ACFN_TwoThousandSixStockincentivePlanMember		  
2006 Restated Stock Incentive Plan [Member]                              
Option granted               1,122,072us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ACFN_TwoThousandSixRestatedStockIncentivePlanMember		              
2006 Director Plan [Member]                              
Option granted               55,140us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ACFN_TwoThousandSixDirectorPlanMember		              
USSI 2012 Stock Option Plan [Member]                              
Increase number of shares available               1,180,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ACFN_USSITwoThousandTwleveStockOptionPlanMember		              
Conversion of stock description              

The options vest over a three to four year period based on date of hire or other benchmark specified in the option agreement. Upon exercise of all the options in the Plan, the Company’s holdings in USSI will be diluted from 95.7% (on an as converted basis) to approximately 88.4% (see Note 3(b))

              
Option granted                  50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ACFN_USSITwoThousandTwleveStockOptionPlanMember		            
Weighted average period of Options outstanding               4 years 8 months 12 days 5 years 8 months 12 days            
Weighted average exercise price, Granted                  $ 1.72us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ACFN_USSITwoThousandTwleveStockOptionPlanMember		            
Weighted average exercise price of forfeitures               $ 1.72us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ACFN_USSITwoThousandTwleveStockOptionPlanMember		 $ 1.72us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ACFN_USSITwoThousandTwleveStockOptionPlanMember		            
Option exercisable period               4 years 8 months 12 days 5 years 8 months 12 days            
Placement Agent [Member]                              
Warrants issued 214,285ACFN_WarrantsIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		                            
Warrants conversion into stock price per share $ 1.26us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		                            
Expected life                         5 years    
Annual volatility                         62.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		    
Annual dividend rate                               
Warrants granted in connection with November 2014 Capital Raise                         214,285ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsGrantsInPeriod
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		    
Weighted average contractual life of warrants period                         5 years    
Warrants exercise price per share                         $ 1.26ACFN_InvestmentWarrantsExercisePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		    
Value of warrants                         97us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		    
Discount rate                         1.60%ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDiscountRate
/ us-gaap_SubsidiarySaleOfStockAxis
= ACFN_PlacementAgentMember		    
Unregistered Shares [Member]                              
Common stock, shares issued 4,285,714us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= ACFN_UnregisteredSharesMember		                            
Common stock, per share $ 1.05us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= ACFN_UnregisteredSharesMember		                            
Warrants conversion into stock price per share $ 1.30us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_StatementEquityComponentsAxis
= ACFN_UnregisteredSharesMember		                            
Warrants [Member]                              
Expected life               5 years 6 months              
Annual volatility               63.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		              
Annual dividend rate                               
Warrants granted in connection with November 2014 Capital Raise               2,142,847ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsGrantsInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		              
Weighted average contractual life of warrants period               5 years 6 months              
Warrants exercise price per share               $ 1.30ACFN_InvestmentWarrantsExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		              
Value of warrants               $ 1,018us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		              
Discount rate               1.60%ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDiscountRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		              
Warrants exercised                 2,954us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		            
Warrants forfeited                 2,796us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		            
Derivative Liability [Member]                              
Risk free interest rate                         1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DebtInstrumentAxis
= ACFN_DerivativeLiabilityMember		    
Expected life                         3 years 3 months 18 days    
Annual volatility                         70.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DebtInstrumentAxis
= ACFN_DerivativeLiabilityMember		    
Annual dividend rate                               
Minimum [Member]                              
Number of capital stock authorized                             20,000,000us-gaap_CapitalUnitsAuthorized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | USSI Stock Option Plan [Member]                              
Fully diluted acorn holding upon conversion of preferred shares               88.40%ACFN_FullyDilutedHoldingCompanyUponConversionOfPreferredShares
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Option vested period               3 years              
Maximum [Member]                              
Number of capital stock authorized                             30,000,000us-gaap_CapitalUnitsAuthorized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | USSI Stock Option Plan [Member]                              
Acorn holding upon conversion of preferred shares               95.70%ACFN_HoldingCompanyUponConversionOfPreferredShares
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= ACFN_USSIStockOptionPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
Option vested period               4 years              
Maximum [Member] | 2006 Stock Incentive Plan [Member] | Non-Employee Directors [Member]                              
Increase number of shares available                           200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ACFN_TwoThousandSixStockincentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ACFN_NonEmployeeDirectorsMember