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Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	May 10, 2012	Nov. 08, 2011	Oct. 11, 2010	Dec. 31, 2014	Mar. 31, 2014	Apr. 08, 2011	Apr. 13, 2014	Oct. 11, 2013
Derivative [Line Items]
Warrants issued to acquire common shares		260,417omex_ClassOfWarrantOrRightWarrantsIssued		1,800,000omex_ClassOfWarrantOrRightWarrantsIssued
Warrants expiration date	Apr. 13, 2014
Shares available for issuance upon exercise		434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing	434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing
Additional financing		$ 8,000,000us-gaap_DebtInstrumentFaceAmount
Derivative Financial Instruments, Assets [Member] | Level 3 [Member]
Derivative [Line Items]
Linked common shares	1,562,500omex_FairValueAssumptionsLinkedCommonShares / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member				1,562,500omex_FairValueAssumptionsLinkedCommonShares / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	1,562,500omex_FairValueAssumptionsLinkedCommonShares / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Warrants Attached to Series G Preferred Stock [Member]
Derivative [Line Items]
Warrants issued to acquire common shares							525,000omex_ClassOfWarrantOrRightWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeriesGPreferredStockMember
Warrants Attached to Senior Convertible Debt [Member]
Derivative [Line Items]
Warrants issued to acquire common shares			1,302,083omex_ClassOfWarrantOrRightWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember
Warrants exercisable date	Nov. 09, 2016
Warrants linked to common stock, outstanding	1,562,500us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember
Common Stock [Member]
Derivative [Line Items]
Linked common shares								525,000omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrants linked to common stock, outstanding	0us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Stock [Member] | Level 3 [Member]
Derivative [Line Items]
Linked common shares									1,725,000omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrants exercisable date	Oct. 11, 2013

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- Definition

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+ References

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+ References

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+ References

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- Definition

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+ References

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- Definition

Date the warrants or rights are exercisable, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(3))

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- Definition

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

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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