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

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- Definition Exercise of warrants. + References No definition available. + Details
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- Definition Redemptions of senior convertible notes. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 + Details
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