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Income Taxes Income Taxes - Schedule of temporary differences (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Accrued expenses $ 322,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 1,200,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Accounts receivable 431,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 595,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Deferred tax assets, inventory 845,000us-gaap_DeferredTaxAssetsInventory  
Inventories   (2,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Other 1,506,000us-gaap_DeferredTaxAssetsOther 1,790,000us-gaap_DeferredTaxAssetsOther
Valuation allowance (3,573,000)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (3,608,000)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total current (469,000)us-gaap_DeferredTaxLiabilitiesCurrent (25,000)us-gaap_DeferredTaxLiabilitiesCurrent
Property, plant, and equipment (14,400,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (20,392,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Customer relationships (16,559,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (19,991,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Net operating losses 104,232,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 89,678,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 6,723,000emax_DeferredTaxAssetsOtherNoncurrent 4,790,000emax_DeferredTaxAssetsOtherNoncurrent
Valuation allowance (95,890,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (72,978,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total non-current (15,894,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (18,893,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Total, net (16,363,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (18,918,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax assets, gross 117,200,000us-gaap_DeferredTaxAssetsGross 72,700,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities, gross $ (34,100,000)us-gaap_DeferredIncomeTaxLiabilities $ (15,000,000)us-gaap_DeferredIncomeTaxLiabilities