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Mortgage and Loans Payable - Schedule of Allocation of Cash Proceeds to Derivative Components at their Fair Values - Project Term Loan (Detail) (USD $)	Mar. 31, 2015
Short-term Debt [Line Items]
Convertible notes payable	$ 9,955,000us-gaap_ConvertibleNotesPayable
Compound Embedded Derivative [Member]
Short-term Debt [Line Items]
Convertible notes payable	2,989,537us-gaap_ConvertibleNotesPayable / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
First Tranche [Member] | Project Term Loans [Member]
Short-term Debt [Line Items]
Convertible notes payable	5,000,000us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheOneMember / invest_InvestmentAxis = omex_ProjectTermLoanMember
First Tranche [Member] | Project Term Loans [Member] | 2014 Convertible Promissory Notes [Member]
Short-term Debt [Line Items]
Convertible notes payable	3,918,254us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheOneMember / invest_InvestmentAxis = omex_ProjectTermLoanMember / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember
First Tranche [Member] | Project Term Loans [Member] | Common Shares Outstanding [Member]
Short-term Debt [Line Items]
Convertible notes payable	250,000us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheOneMember / invest_InvestmentAxis = omex_ProjectTermLoanMember / us-gaap_StatementEquityComponentsAxis = omex_CommonSharesOutstandingMember
First Tranche [Member] | Compound Embedded Derivative [Member] | Project Term Loans [Member]
Short-term Debt [Line Items]
Convertible notes payable	831,746us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheOneMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / invest_InvestmentAxis = omex_ProjectTermLoanMember
Second Tranche [Member] | Project Term Loans [Member]
Short-term Debt [Line Items]
Convertible notes payable	2,500,000us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheTwoMember / invest_InvestmentAxis = omex_ProjectTermLoanMember
Second Tranche [Member] | Project Term Loans [Member] | 2014 Convertible Promissory Notes [Member]
Short-term Debt [Line Items]
Convertible notes payable	1,937,540us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheTwoMember / invest_InvestmentAxis = omex_ProjectTermLoanMember / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember
Second Tranche [Member] | Compound Embedded Derivative [Member] | Project Term Loans [Member]
Short-term Debt [Line Items]
Convertible notes payable	562,460us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheTwoMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / invest_InvestmentAxis = omex_ProjectTermLoanMember
Third Tranche [Member] | Project Term Loans [Member]
Short-term Debt [Line Items]
Convertible notes payable	2,500,000us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheThreeMember / invest_InvestmentAxis = omex_ProjectTermLoanMember
Third Tranche [Member] | Project Term Loans [Member] | 2014 Convertible Promissory Notes [Member]
Short-term Debt [Line Items]
Convertible notes payable	1,909,127us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheThreeMember / invest_InvestmentAxis = omex_ProjectTermLoanMember / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember
Third Tranche [Member] | Compound Embedded Derivative [Member] | Project Term Loans [Member]
Short-term Debt [Line Items]
Convertible notes payable	$ 590,873us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheThreeMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / invest_InvestmentAxis = omex_ProjectTermLoanMember

X

- 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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- Details

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- Details

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- Details

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