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Deferred Income and Revenue Participation Rights - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 11, 2015 | Mar. 31, 2015 | Feb. 28, 2011 | Dec. 31, 2014 | Mar. 31, 2013
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Deferred income from revenue participation rights |  | $ 4,643,750 us-gaap_DeferredRevenueNoncurrent |  | $ 4,643,750 us-gaap_DeferredRevenueNoncurrent |
Revenue participation agreement |  | 15,000,000 omex_RevenueParticipationAgreementValue |  |  |
Promissory note face amount |  | 9,955,000 us-gaap_ConvertibleNotesPayable |  |  |
Oceanica Call Option [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Stock granted during period, value | 40,000,000 omex_StockGrantedValueUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember | 40,000,000 omex_StockGrantedValueUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember |  |  |
Stock granted during period, percentage | 54.00%omex_StockGrantedPercentageUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember | 54.00%omex_StockGrantedPercentageUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember |  |  |
Promissory Note [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Promissory note face amount | 14,750,000 us-gaap_ConvertibleNotesPayable / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteMember |  |  |  |
"Seattle" Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Percentage of revenue owed to certificate holder per each million invested |  | 1.00%omex_PercentageOfRevenueOwedToCertificateHoldersPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember |  |  |
Common shares issued per unit |  | 100,000 omex_CommonSharesIssuedPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember |  |  |
Galt Resources, LLC [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Percentage of revenue owed to certificate holders |  | 50.00%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Percentage of revenue owed to certificate holder per each million invested |  | 1.00%omex_PercentageOfRevenueOwedToCertificateHoldersPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Investment multiplier in case of project success |  | 3 omex_InvestmentMultiplierInCaseOfProjectSuccess / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Projects after bifurcation |  | 2 omex_NumberOfProjectsAfterBifurcation / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Galt Resources, LLC [Member] | SS Gairsoppa [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Deferred revenue |  | 3,756,250 us-gaap_DeferredRevenueRevenueRecognized / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = omex_SsGairsoppaMember / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Deferred income from revenue participation rights |  |  |  |  | 12,506,755 us-gaap_DeferredRevenueNoncurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = omex_SsGairsoppaMember / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Galt Resources, LLC [Member] | Maximum [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Investment for future revenue rights |  |  | 7,512,500 omex_InvestmentForFutureRevenueRights / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
HMS Victory Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Percentage of revenue owed to certificate holders |  | 7.5125%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_HmsVictoryProjectMember |  |  |
Revenue Participation Certificates [Member] | "Cambridge" Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Revenue participation certificates per unit value |  | 50,000 us-gaap_InvestmentOwnedRestrictedCarryingValuePerUnitAtDateOfBalanceSheet / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_RevenueParticipationCertificatesMember |  |  |
Revenue Participation Certificates [Member] | "Seattle" Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Revenue participation certificates per unit value |  | 50,000 us-gaap_InvestmentOwnedRestrictedCarryingValuePerUnitAtDateOfBalanceSheet / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember / invest_InvestmentAxis = omex_RevenueParticipationCertificatesMember |  |  |
First Payment [Member] | "Cambridge" Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Percentage of revenue owed to certificate holders |  | 100.00%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsFirstPaymentMember |  |  |
Revenue owed to certificate holder |  | 825,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsFirstPaymentMember |  |  |
Second Payment [Member] | "Cambridge" Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Percentage of revenue owed to certificate holders |  | 24.75%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsSecondPaymentMember |  |  |
Second Payment [Member] | "Cambridge" Project [Member] | Minimum [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Revenue owed to certificate holder |  | 4,000,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsSecondPaymentMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Second Payment [Member] | "Cambridge" Project [Member] | Maximum [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Revenue owed to certificate holder |  | 35,000,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsSecondPaymentMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Third Payment [Member] | "Cambridge" Project [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Percentage of revenue owed to certificate holders |  | 12.375%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsThirdPaymentMember |  |  |
Revenue owed to certificate holder |  | $ 35,000,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsThirdPaymentMember |  |  |

X
- Definition Common shares issued per unit. + References No definition available. + Details
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- Definition Investment for future revenue rights. + References No definition available. + Details
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- Definition Investment multiplier in case of project success. + References No definition available. + Details
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- Definition Number of projects after bifurcation. + References No definition available. + Details
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- Definition Percentage of revenue owed to certificate holders. + References No definition available. + Details
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- Definition Percentage of revenue owed to certificate holders per unit. + References No definition available. + Details
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- Definition Revenue owed to certificate holders. + References No definition available. + Details
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- Definition Stock granted percentage upon conversion of convertible securities. + References No definition available. + Details
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- Definition Stock granted value upon conversion of convertible securities. + 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 The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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- Definition Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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