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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 11, 2015
Mar. 09, 2015
Feb. 28, 2011
Dec. 31, 2011
Dec. 09, 2002
May 26, 1998
Gain Contingencies [Line Items]                  
Deferred income from revenue participation rights   $ (555,064)omex_DeferredIncomeFromRevenueParticipationRights $ (4,465,868)omex_DeferredIncomeFromRevenueParticipationRights            
Income derived from Cambridge RPC's 12,986omex_PaymentForOneTimeRevenueDistribution                
Post finance cost proceeds               5.00%omex_PercentageOfProceedsFromShipwrecksReceivableUnderAgreement 5.00%omex_PercentageOfProceedsFromShipwrecksReceivableUnderAgreement
Non-restricted cash balance 3,143,550us-gaap_CashAndCashEquivalentsAtCarryingValue 21,322,257us-gaap_CashAndCashEquivalentsAtCarryingValue 10,096,414us-gaap_CashAndCashEquivalentsAtCarryingValue       7,971,794us-gaap_CashAndCashEquivalentsAtCarryingValue    
Working capital deficit 7,600,000omex_WorkingCapitalDeficit                
Bank loan amount 7,700,000us-gaap_BankLoans                
Bank loan maturity period 2015                
Total assets 25,089,539us-gaap_Assets 51,460,607us-gaap_Assets              
Subsequent Event [Member]                  
Gain Contingencies [Line Items]                  
Minimum bid price         $ 1.00omex_CommonStockMinimumBidPrice
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Number of consecutive business days not complied with minimum bid price         30 days        
Number of days afforded to regain compliance with minimum bid price requirement         180 days        
Loans amount       14,800,000omex_LoansAndLeasesReceivableNetReportedAmountRelatedToPurchasedCreditImpairedLoans
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		          
Period to purchase additional preferred shares       5 years          
Seattle and Cambridge Projects [Member]                  
Gain Contingencies [Line Items]                  
Deferred income from revenue participation rights 887,500omex_DeferredIncomeFromRevenueParticipationRights
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omex_SeattleAndCambridgeProjectsMember		                
Galt Resources [Member] | Maximum [Member]                  
Gain Contingencies [Line Items]                  
Investment for future revenue rights           $ 7,512,500omex_InvestmentForFutureRevenueRights
/ us-gaap_ExtinguishmentOfDebtAxis
= omex_GaltResourcesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember