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Derivative Financial Instruments - Changes in Fair Value Inputs and Assumptions Related to Derivative Warrants (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Issuances: |  |
Senior Convertible Note Financing | $ 9,955,000 us-gaap_ConvertibleNotesPayable |
Warrant Derivatives [Member] |  |
Derivative [Line Items] |  |
Balances at January 1 | 923,580 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember | 3,826,619 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Issuances: |  |
Series G Convertible Preferred Stock Financing | 0 omex_FairValueOfWarrantsIssued / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember | 0 omex_FairValueOfWarrantsIssued / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Senior Convertible Note Financing | 0 us-gaap_ConvertibleNotesPayable / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember | 0 us-gaap_ConvertibleNotesPayable / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Exercises: |  |
Series G Convertible Preferred Stock Financing |  | (922,875)omex_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExercise / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Changes in fair value inputs and assumptions reflected in income | (812,453)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember | (1,980,164)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Balances at December 31 | $ 111,127 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember | $ 923,580 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liability exercise. + References No definition available. + Details
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- Definition Fair value of warrants issued. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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