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Segment Reporting and Geographic Information - Revenues, Accounts Receivable and Unbilled Revenue from Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Customer A [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major Customer balance |  |  | $ 1,828
Major Customer balance percentage |  | 0.00% | 21.00%
Customer A [Member] | Accounts Receivable [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major Customer balance | [1],[2] |  |
Major Customer balance percentage | [1],[2] | 0.00% | 0.00%
Customer B [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major Customer balance |  |  | $ 1,295
Major Customer balance percentage |  | 0.00% | 15.00%
Customer B [Member] | Accounts Receivable [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major Customer balance | [1],[2] |  |
Major Customer balance percentage | [1],[2] | 0.00% | 0.00%
Customer C [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major Customer balance | [1] |  |
Major Customer balance percentage | [1] | 0.00% | 0.00%
Customer C [Member] | Accounts Receivable [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major Customer balance | [2] | $ 297 | $ 283
Major Customer balance percentage | [2] | 27.00% | 28.00%
[1] | Balance is not significant
[2] | Following the closing of the 2016 DSIT Transaction (see Note 3), the Company no longer consolidates the assets, liabilities or results of DSIT, but rather reports its investment in DSIT using the equity method. Accordingly, the Company no longer reports DSIT’s Accounts Receivable or Unbilled Revenue balances.

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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
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: |