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Equity - Summary of Option Exercises between Cashless Net Exercises and Cash Exercises (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]    
Shares granted in net exercise of options 33,938us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised [1] 30,316us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised [1]
Options forfeited in net exercise of options 76,062ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSharesForfeitedInNetExerciseInPeriod 102,184ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSharesForfeitedInNetExerciseInPeriod
Total net exercise options 110,000ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNetExerciseInPeriod 132,500ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNetExerciseInPeriod
Weighted average exercise price for net exercise options $ 2.51us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice [1] $ 3.30us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice [1]
Options exercised for cash      
Weighted average exercise price for options exercised for cash      
[1] All shares issued in connection with option exercises were newly issued shares.