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Equity - Schedule of Dividends Paid Since Approval of Quarterly Dividend (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]      
Regular dividend paid per share $ 0.035ACFN_RegularDividendPaidPerShare   $ 0.035ACFN_RegularDividendPaidPerShare
Special dividend paid per share        
Total dividends paid $ 0.035ACFN_NetDividendsPaidPerShare   $ 0.035ACFN_NetDividendsPaidPerShare
Dividend paid in cash $ 517us-gaap_PaymentsOfDividends    $ 517us-gaap_PaymentsOfDividends
Value of dividend paid in shares under the DRIP 117us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan   117us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
Total dividend paid 634ACFN_DividendPaidNetAmount   634ACFN_DividendPaidNetAmount
Value of share discount under the DRIP $ 6ACFN_DividendReinvestmentPlanDiscount   $ 6ACFN_DividendReinvestmentPlanDiscount
Number of share granted under the DRIP 18,976us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan   18,976us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan