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EQUITY Share-based compensation expense (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Equity [Abstract] |  |  |  |
Share based compensation expense in cost of sales | $ 2 | $ 44 | $ 2 | $ 44
Share based compensation expense in research and development expense | 33 | 10 | 59 | 31
Share based compensation expense in selling, general and administrative expense | 81 | 329 | 675 | 907
Share-based Compensation | $ 116 | $ 383 | $ 736 | $ 982

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- Definition Share based compensation expense in cost of sales + References No definition available. + Details
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Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share based compensation expense in research and development expense + References No definition available. + Details
Name: | acfn_ShareBasedCompensationExpenseInResearchAndDevelopmentExpense
Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share based compensation expense in selling, general and administrative expense + References No definition available. + Details
Name: | acfn_ShareBasedCompensationExpenseInSellingGeneralAndAdministrativeExpense
Namespace Prefix: | acfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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