XML 27 R124.htm IDEA: XBRL DOCUMENT
v2.4.0.6

SUBSEQUENT EVENTS Acorn investment in USSI (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2012 | Jul. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2012 | Mar. 01, 2013 Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |  |
Preferred stock purchase USSI | $ 2,500 | $ 2,500 |  | $ 2,500 | $ 2,500
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  |  | 93.60% |  | 95.00%
Preferred share purchase - USSI - future |  |  |  |  | $ 2,500
Cumulative Percentage Ownership after All Future Transactions | 94.40% |  |  |  | 95.60%
fully diluted ownership | 85.10% |  |  | 71.40% | 87.90%

X
- Definition Cumulative Percentage Ownership after All Future Transactions [Line Items] + References No definition available. + Details
Name: | acfn_CumulativePercentageOwnershipAfterAllFutureTransactions
Namespace Prefix: | acfn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fully diluted ownership + References No definition available. + Details
Name: | acfn_FullyDilutedOwnership
Namespace Prefix: | acfn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred share purchase - USSI - future + References No definition available. + Details
Name: | acfn_PreferredSharePurchaseUssiFuture
Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition USSI preferred stock purchase + References No definition available. + Details
Name: | acfn_PreferredStockPurchaseUssi
Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration