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Equity - Schedule of Option Grants To Directors and Officers (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Number of shares, Granted | 664,103 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  | 246,095 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |
Number of shares, Exercised | (33,938)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | [1] | (30,316)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | [1]
Number of shares, Forfeited | (219,395)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |  | (125,518)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |
Weighted average exercise price, Granted | $ 2.14 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  | $ 6.06 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |
Weighted average exercise price, Exercised | $ 2.51 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | [1] | $ 3.30 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | [1]
Weighted average exercise price, Forfeited | $ 3.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |  | $ 4.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |
Directors And Officers [Member] |  |  |  |
Number of shares, Granted | 634,103 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | 201,095 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember | [2]
Number of shares, Exercised | 33,938 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | 30,316 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
Number of shares, Forfeited | 191,062 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | 125,518 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
Number of shares, Options held | 1,535,428 ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsHeldInPeriod / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | 1,179,658 ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsHeldInPeriod / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
Weighted average exercise price, Granted | $ 2.12 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | $ 5.98 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
Weighted average exercise price, Exercised | $ 2.51 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | $ 3.30 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
Weighted average exercise price, Forfeited | $ 3.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | $ 4.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
Weighted average exercise price, Options held | $ 4.24 ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsHeldInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |  | $ 5.30 ACFN_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsHeldInPeriodWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = ACFN_DirectorsAndOfficersMember |
[1] | All shares issued in connection with option exercises were newly issued shares.
[2] | * Includes 25,000 options granted to a director of USSI.

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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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