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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, 2016 | Dec. 31, 2015
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Segment Reporting [Abstract] |  |
Investment in DSIT | $ 5,658 |
Escrow deposit | $ 579 | $ 100

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