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

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Shares Forfeited in Net Exercise in Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises for Cash in Period, Weighted Average Exercise Price + References No definition available. + Details
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- Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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