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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative liabilities	$ 2,226,445us-gaap_DerivativeLiabilitiesCurrent	$ 970,823us-gaap_DerivativeLiabilitiesCurrent
Common shares linked to derivative liabilities	4,737,104us-gaap_CommonStockOtherSharesOutstanding	3,817,147us-gaap_CommonStockOtherSharesOutstanding
Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	2,115,318us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	47,243us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Common shares linked to derivative liabilities	3,174,604us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember	1,729,647us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	111,127us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember	923,580us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Common shares linked to derivative liabilities	1,562,500us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember	2,087,500us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember
Senior Convertible Notes [Member] | Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities		47,243us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember
Common shares linked to derivative liabilities		1,729,647us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember
Senior Convertible Notes [Member] | Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	111,127us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember	840,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember
Common shares linked to derivative liabilities	1,562,500us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember	1,562,500us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember / us-gaap_StatementClassOfStockAxis = omex_SeniorConvertibleNotesMember
2014 Convertible Promissory Notes [Member] | Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	2,115,318us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember
Common shares linked to derivative liabilities	3,174,604us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember
Series G Convertible Preferred Stock [Member] | Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities		$ 83,580us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember
Common shares linked to derivative liabilities		525,000us-gaap_CommonStockOtherSharesOutstanding / us-gaap_DerivativeInstrumentRiskAxis = omex_WarrantDerivativeMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember

X

- Definition

Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

+ References

No definition available.

+ Details

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X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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- Details

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- Details

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- Details

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- Details

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