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Income Taxes - Schedule of Deferred Tax Assets and Liabiliites (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets, Employee benefits and deferred compensation | $ 1,999 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | $ 1,679 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred tax assets Asset impairments | 5,868 ACFN_DeferredTaxAssetsAttributableToInvestmentsAndAssetImpairments | 2,693 ACFN_DeferredTaxAssetsAttributableToInvestmentsAndAssetImpairments
Deferred tax assets, other temporary differences | 569 us-gaap_DeferredTaxAssetsOther | 262 us-gaap_DeferredTaxAssetsOther
Deferred tax assets Net operating loss carryforwards | 18,172 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 9,713 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Gross | 26,608 us-gaap_DeferredTaxAssetsGross | 14,347 us-gaap_DeferredTaxAssetsGross
Valuation Allowance, Amount | (26,121)us-gaap_DeferredTaxAssetsValuationAllowance | (13,758)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | $ 487 us-gaap_DeferredTaxAssetsNet | $ 589 us-gaap_DeferredTaxAssetsNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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