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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative income (expense) $ 1,001,679us-gaap_DerivativeGainLossOnDerivativeNet $ 2,573,165us-gaap_DerivativeGainLossOnDerivativeNet
Exercise of Warrants   922,875omex_ExerciseOfWarrants
Redemptions of Senior Convertible Notes   889,340omex_RedemptionsOfSeniorConvertibleNotes
Total derivative income (expense) 1,001,679us-gaap_GainLossOnDerivativeInstrumentsNetPretax 4,385,380us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Senior Convertible Notes [Member]    
Derivative [Line Items]    
Derivative income (expense) 47,243us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementClassOfStockAxis
= omex_SeniorConvertibleNotesMember		 593,001us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementClassOfStockAxis
= omex_SeniorConvertibleNotesMember
2014 Convertible Promissory Notes [Member]    
Derivative [Line Items]    
Derivative income (expense) 141,983us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementClassOfStockAxis
= omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember		  
Warrant Derivatives [Member]    
Derivative [Line Items]    
Derivative income (expense) $ 812,453us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= omex_WarrantDerivativeMember		 $ 1,980,164us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= omex_WarrantDerivativeMember