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v2.4.1.9

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

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