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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
Income Tax Disclosure [Abstract]    
Deferred tax assets, Employee benefits and deferred compensation $ 1,999us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits $ 1,679us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred tax assets Asset impairments 5,868ACFN_DeferredTaxAssetsAttributableToInvestmentsAndAssetImpairments 2,693ACFN_DeferredTaxAssetsAttributableToInvestmentsAndAssetImpairments
Deferred tax assets, other temporary differences 569us-gaap_DeferredTaxAssetsOther 262us-gaap_DeferredTaxAssetsOther
Deferred tax assets Net operating loss carryforwards 18,172us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 9,713us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Gross 26,608us-gaap_DeferredTaxAssetsGross 14,347us-gaap_DeferredTaxAssetsGross
Valuation Allowance, Amount (26,121)us-gaap_DeferredTaxAssetsValuationAllowance (13,758)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets $ 487us-gaap_DeferredTaxAssetsNet $ 589us-gaap_DeferredTaxAssetsNet