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Segment Reporting and Geographic Information - Reconciliation of Segment Data to Consolidated Statement Balance Sheet (Details) (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 21, 2016
--- | --- | --- | ---
Segment Reporting [Abstract] |  |  |
Investment in DSIT | $ 5,800 | $ 5,658 | $ 5,390
Escrow deposit |  | $ 579 |

X
- Definition Escrow Deposit Current. + References No definition available. + Details
Name: | ACFN_EscrowDepositCurrent
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment in DSIT. + References No definition available. + Details
Name: | ACFN_InvestmentInDsit
Namespace Prefix: | ACFN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration