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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative [Line Items] |  |
Total derivative income (expense) | $ (462,903)us-gaap_GainLossOnDerivativeInstrumentsNetPretax | $ (182,713)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Senior Convertible Notes [Member] |  |
Derivative [Line Items] |  |
Derivative income (expense) |  | 47,243 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember
2014 Convertible Promissory Notes [Member] |  |
Derivative [Line Items] |  |
Derivative income (expense) | (479,126)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember |
Warrant Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative income (expense) | $ 16,223 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember | $ (229,956)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember

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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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