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OTHER INVESTMENTS HangXing (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 1995 | Mar. 01, 2011
Schedule of Cost-method Investments [Line Items] |  |
Owenership Percentage |  | 25.00%
Proceeds from sale of an investee company |  | $ 492
Proceeds from sale of an investee company, net of taxes withheld |  | 454
Equity Method Investment Sold, Carrying Amount | $ 250 |

X
- Definition The percentage of ownership of common stock or equity participation in the investee + References No definition available. + Details
Name: | acfn_OwenershipPercentage
Namespace Prefix: | acfn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from sale of an investee company + References No definition available. + Details
Name: | acfn_ProceedsFromSaleOfInvesteeCompany
Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Proceeds from sale of an investee company, net of taxes withheld + References No definition available. + Details
Name: | acfn_ProceedsFromSaleOfInvesteeCompanyNetOfTaxesWithheld
Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the carrying amount of the entity's equity method investment which has been sold. This item is used only for purposes of disclosing the calculated gain (loss) on disposal of the subject equity method investment and not for reporting the carrying value of equity method investments as presented on the entity's balance sheet. For reporting the carrying value of equity method investments presented on the entity's balance sheet, the EquityMethodInvestments (Equity Method Investments) element would be used. + References No definition available. + Details
Name: | us-gaap_EquityMethodInvestmentSoldCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfCostMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration