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Derivative Financial Instruments - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | May 10, 2012 | Nov. 08, 2011 | Oct. 11, 2010 | Apr. 08, 2011 | Apr. 13, 2014 | Oct. 11, 2013
Derivative [Line Items] |  |  |  |  |  |  |  |
Compound embedded derivatives | $ 0 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  | 260,417 omex_ClassOfWarrantOrRightWarrantsIssued |  | 1,800,000 omex_ClassOfWarrantOrRightWarrantsIssued |  |  |
Linked common shares | 1,562,500 omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares | 1,562,500 omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares |  |  |  |  |  |
Warrants expiration date | Apr. 13, 2014 |  |  |  |  |  |  |
Shares available for issuance upon exercise |  |  | 434,027 omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing | 434,027 omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing |  |  |  |
Additional financing |  |  | $ 8,000,000 us-gaap_DebtInstrumentFaceAmount |  |  |  |  |
Warrants Attached to Series G Preferred Stock [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  |  | 525,000 omex_ClassOfWarrantOrRightWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeriesGPreferredStockMember |  |
Warrants Attached to Senior Convertible Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  | 1,302,083 omex_ClassOfWarrantOrRightWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember |  |  |  |
Warrants linked to common stock, outstanding | 1,562,500 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember |  |  |  |  |  |  |
Warrants expiration date | Nov. 09, 2016 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Linked common shares |  |  |  |  |  |  | 525,000 omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Warrants linked to common stock, outstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,725,000 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Common Stock [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Linked common shares |  |  |  |  |  |  |  | 1,725,000 omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrants linked to common stock, outstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Warrants expiration date | Oct. 11, 2013 |  |  |  |  |  |  |

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- Definition Class Of Warrant Or Right, Warrants Issued + References No definition available. + Details
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- Definition Derivative financial instruments fair value assumptions linked common shares. + References No definition available. + Details
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- Definition Number of securities called by warrants or rights upon additional financing. + References No definition available. + Details
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Namespace Prefix: | omex_
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Balance Type: | na
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X
- 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 3 -Article 4 + Details
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- Definition Number of warrants or rights outstanding. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Details
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- Definition Net fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as assets, net of those classified as liabilities. + References Reference 1: 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 + Details
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- Details
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- Details
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