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Stockholders' Equity (Deficit) - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2015 | Mar. 31, 2015 Incentive_Plan | Mar. 31, 2014 | Jun. 03, 2010 | Jan. 16, 2008 | Mar. 31, 2013 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares issued |  | 89,582,502 us-gaap_CommonStockSharesIssued |  |  |  |  | 85,582,502 us-gaap_CommonStockSharesIssued
Common stock, shares value representing payment for principal |  | $ 8,958 us-gaap_CommonStockValue |  |  |  |  | $ 8,558 us-gaap_CommonStockValue
Reverse stock split ratio |  | 1-for-6 |  |  |  |  |
Preferred stock, par value |  | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized |  | 9,675,200 us-gaap_PreferredStockSharesAuthorized |  |  |  |  | 9,675,200 us-gaap_PreferredStockSharesAuthorized
Number of stock incentive plans |  | 1 omex_NumberOfStockIncentivePlans |  |  |  |  |
Shares of common stock for reserved issuance |  | 2,500,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |  |  |
Stock-based compensation, shares granted | 1,652,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |  |  |  |  |
Share-based compensation |  | 594,606 us-gaap_AllocatedShareBasedCompensationExpense | 492,775 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Weighted average fair value of options granted |  | $ 0.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 1.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |  |  |
Series AA-2 Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, par value |  | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = omex_SeriesAaTwoConvertiblePreferredStockMember |  |  |  |  |
Preferred stock, shares authorized |  | 86,677,740 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = omex_SeriesAaTwoConvertiblePreferredStockMember |  |  |  |  |
Series AA-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, par value |  | $ 0.0001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = omex_SeriesAaOneConvertiblePreferredStockMember |  |  |  |  |
Preferred stock, shares authorized |  | 101,124,042 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = omex_SeriesAaOneConvertiblePreferredStockMember |  |  |  |  |
Preferred stock Liquidation preference accretion rate |  | 8.00%omex_PreferredStockAccretionAtAnnualizedRate / us-gaap_StatementClassOfStockAxis = omex_SeriesAaOneConvertiblePreferredStockMember |  |  |  |  |
Mako Resources, LLC [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares issued |  | 4,000,000 us-gaap_CommonStockSharesIssued / us-gaap_BusinessAcquisitionAxis = omex_MakoMember |  |  |  |  |
Common stock, shares value representing payment for principal |  | 2,520,000 us-gaap_CommonStockValue / us-gaap_BusinessAcquisitionAxis = omex_MakoMember |  |  |  |  |
Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares termination of option to acquire |  | 6,000,000 omex_NumberOfTerminatedOptionToPurchaseShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_OceanicaResourcesMember |  |  |  |  |
Penelope Mining LLC [Member] | Series AA-2 Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of trading days |  | 20 days |  |  |  |  |
Minimum [Member] | Penelope Mining LLC [Member] | Series AA-2 Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Closing price of common stock |  | $ 1.26 us-gaap_DebtInstrumentConvertibleStockPriceTrigger / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaTwoConvertiblePreferredStockMember |  |  |  |  |
Warrants Attached to Senior Convertible Debt [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrants to purchase shares of common stock outstanding |  | 1,562,500 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember |  |  |  |  |
Warrants exercise price |  | $ 3.60 invest_InvestmentWarrantsExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember |  |  |  |  |
Warrants expiration date |  | Nov. 09, 2016 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units, shares granted | 951,381 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares issued |  |  | 1,290,155 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 3,552,357 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Common stock, shares value representing payment for principal |  |  | $ 2,420,863 us-gaap_CommonStockValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | $ 9,280,242 us-gaap_CommonStockValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Common shares issued from conversion of warrants |  |  |  |  |  | 2,010,500 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Warrants to purchase shares of common stock outstanding |  | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Additional shares authorized for stock-based compensation |  |  |  | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise price of incentive option granted |  | Exercise price of any incentive option granted to an officer, director or eligible employee owning more than 10% of our outstanding common stock must not be less than 110% of fair market value on the date of the grant. |  |  |  |  |
Stock incentive plan expiration date |  | Aug. 31, 2015 |  |  |  |  |
Common Stock [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Eligible employee threshold percentage |  | 10.00%omex_EligibleEmployeeThresholdPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Purchase price of common stock percentage |  | 110.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common Stock [Member] | Restricted Stock Awards and Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = omex_RestrictedStockAwardsAndRestrictedStockUnitsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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