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Segment Reporting and Geographic Information - Revenues from Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Customer A [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 2,701 |
Major Customer balance percentage | 14.00% |
Customer A [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer A [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer B [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 2,735 | $ 3,997
Major Customer balance percentage | 14.00% | 20.00%
Customer B [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 1,844 | $ 1,135
Major Customer balance percentage | 28.00% | 23.00%
Customer B [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 1,507 | $ 2,788
Major Customer balance percentage | 39.00% | 35.00%
Customer C [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 2,889 |
Major Customer balance percentage | 15.00% |
Customer C [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 1,049 |
Major Customer balance percentage | 16.00% |
Customer C [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 1,087 |
Major Customer balance percentage | 28.00% |
Customer D [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 2,200 | $ 1,940
Major Customer balance percentage | 12.00% | 10.00%
Customer D [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 834 |
Major Customer balance percentage | 12.00% |
Customer D [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  | $ 1,402
Major Customer balance percentage |  | 18.00%
Customer E [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer E [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 1,112 |
Major Customer balance percentage | 17.00% |
Customer E [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer E [Member] | Energy & Security Sonar Solutions [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  | $ 979
Major Customer balance percentage |  | 12.00%
Customer F [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer F [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer F [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance | $ 408 |
Major Customer balance percentage | 11.00% |
Customer F [Member] | Energy & Security Sonar Solutions [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer G [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer G [Member] | Accounts Receivable [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer G [Member] | Unbilled Revenues [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  |
Major Customer balance percentage |  |
Customer G [Member] | Energy & Security Sonar Solutions [Member] |  |
Revenue, Major Customer [Line Items] |  |
Major Customer balance |  | $ 1,266
Major Customer balance percentage |  | 16.00%

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- Definition Major Customer balance. + References No definition available. + Details
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Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Major Customer balance percentage. + References No definition available. + Details
Name: | ACFN_MajorCustomerBalancePercentage
Namespace Prefix: | ACFN_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=ACFN_CustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=ACFN_CustomerBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=ACFN_CustomerCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ACFN_EnergySecuritySonarSolutionsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=ACFN_CustomerFMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=ACFN_CustomerGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |