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

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- Definition

Fair value of warrants issued.

+ References

No definition available.

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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

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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

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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

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