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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |
Quoted market price on valuation date | 2.50 omex_FairValueAssumptionsQuotedPrice |
Warrant Group 1 [Member] | Level 3 [Member] | Minimum [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities |  | 50.10%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Risk free rates using zero coupon US Treasury Security rates |  | 0.01%omex_RiskFreeRatesUsingZeroCouponCountryTreasurySecurityRangeOfRates / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Warrant Group 1 [Member] | Level 3 [Member] | Maximum [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities |  | 88.30%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Risk free rates using zero coupon US Treasury Security rates |  | 0.07%omex_RiskFreeRatesUsingZeroCouponCountryTreasurySecurityRangeOfRates / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Warrant Group 1 [Member] | Level 3 [Member] | Derivative Financial Instruments, Assets [Member] |  |
Derivative [Line Items] |  |
Linked common shares |  | 525,000 omex_FairValueAssumptionsLinkedCommonShares / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Quoted market price on valuation date |  | 2.02 omex_FairValueAssumptionsQuotedPrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Contractual exercise rate |  | 2.3793 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupOneMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Term (years) |  | 3 months 11 days
Warrant Group 2 [Member] | Level 3 [Member] | Minimum [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities | 59.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember | 51.10%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Risk free rates using zero coupon US Treasury Security rates | 0.04%omex_RiskFreeRatesUsingZeroCouponCountryTreasurySecurityRangeOfRates / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.07%omex_RiskFreeRatesUsingZeroCouponCountryTreasurySecurityRangeOfRates / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Warrant Group 2 [Member] | Level 3 [Member] | Maximum [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities | 73.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember | 78.20%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Risk free rates using zero coupon US Treasury Security rates | 0.67%omex_RiskFreeRatesUsingZeroCouponCountryTreasurySecurityRangeOfRates / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.78%omex_RiskFreeRatesUsingZeroCouponCountryTreasurySecurityRangeOfRates / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Warrant Group 2 [Member] | Level 3 [Member] | Derivative Financial Instruments, Assets [Member] |  |
Derivative [Line Items] |  |
Linked common shares | 1,562,500 omex_FairValueAssumptionsLinkedCommonShares / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 1,562,500 omex_FairValueAssumptionsLinkedCommonShares / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Quoted market price on valuation date | 0.93 omex_FairValueAssumptionsQuotedPrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2.02 omex_FairValueAssumptionsQuotedPrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Contractual exercise rate | 3.60 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 3.60 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Term (years) | 2 years 4 months 24 days | 3 years 4 months 6 days
Custom lattice variable: Probability of exercisability (434,027 linked common shares) | 0.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Fair Value Assumptions Linked Common Shares + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Fair value assumptions quoted price. + References No definition available. + Details
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X
- Definition Risk free rates using zero coupon country treasury security range of rates. + References No definition available. + Details
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- Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Agreed upon price for the exchange of the underlying asset. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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