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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss and tax credit carryforwards $ 49,239,489omex_DeferredTaxAssetsNetOperatingLossAndCapitalLossCarryforwards  
Capital loss carryforward 385,185us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
Accrued expenses 62,671omex_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedExpenses  
Deferred revenue 644,362us-gaap_DeferredTaxAssetsDeferredIncome  
Reserve for accounts receivable 1,873,028omex_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivable  
Reserve for inventory 130,011omex_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsInventory  
Start-up costs 107,153omex_DeferredTaxAssetsStartUpCosts  
Excess of book over tax depreciation 2,766,649us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross  
Stock option and restricted stock award expense 1,389,793us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Investment in unconsolidated entity 3,870,218us-gaap_DeferredTaxAssetsEquityMethodInvestments  
Less: valuation allowance (60,312,726)us-gaap_DeferredTaxAssetsValuationAllowance (51,625,159)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets 155,833us-gaap_DeferredTaxAssetsNet  
Deferred tax liability:    
Property and equipment basis 69,311us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Prepaid expenses 86,522us-gaap_DeferredTaxLiabilitiesPrepaidExpenses  
Deferred tax liabilities 155,833us-gaap_DeferredTaxLiabilities  
Net deferred tax asset $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet