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Mortgage and Loans Payable - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Apr. 30, 2014
Jul. 31, 2013
Dec. 31, 2014
Coins
Dec. 31, 2013
Dec. 31, 2012
May 07, 2014
Nov. 30, 2011
Investor
Jul. 11, 2011
May 31, 2008
May 10, 2012
Aug. 14, 2014
May 31, 2014
Oct. 01, 2014
Oct. 01, 2015
Dec. 01, 2014
Jan. 02, 2013
Jul. 11, 2008
Debt Instrument [Line Items]                                  
Basis spread on variable rate   0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1                              
Secured collateral     24,700omex_SecuredCollateral                            
Value of secured collateral, percent     40.00%omex_BorrowingBaseValueOfSecuredCollateralPercentage                            
Aggregate amount issuable                   $ 8,000,000us-gaap_DebtInstrumentFaceAmount              
Shares issued to lender       24,000,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction                          
Debt instrument, number of shares 5,225us-gaap_DebtConversionConvertedInstrumentSharesIssued1                                
Debt instrument, Value of shares     2,347,826us-gaap_DebtConversionConvertedInstrumentAmount1 8,608,694us-gaap_DebtConversionConvertedInstrumentAmount1 4,262,528us-gaap_DebtConversionConvertedInstrumentAmount1                        
Interest rate description     Prime rate plus three-fourths of one percent (0.75%)                            
Company's consolidated debt     15,660,299us-gaap_LongTermDebt                            
Periodic payments, principal     10,750us-gaap_DebtInstrumentPeriodicPaymentPrincipal                            
Warrants issued to purchase common stock     1,302,083omex_MaximumIssueOfWarrantsToPurchaseCommonStock                            
Debt instrument conversion price, percentage     125.00%omex_PercentageOfDebtInstrumentConversionPriceOnMarketPriceOfCommonStock                            
Common stock initial exercise price     $ 4.32us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShare                            
Common stock issued under warrant terms     434,027omex_SharesOfCommonStockIssuableUponExerciseOfWarrant                            
Period to exercise warrants     5 years                            
Warrant exercise price                   $ 3.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1              
Registration statement filing period     6 months                            
Period for registration statement to be effective     90 days thereafter                            
Registration statement review period     120 days thereafter                            
Term of warrant     5 years 6 months                            
Gross proceeds from derivative instrument     10,000,000us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities                            
Investment costs paid from proceeds     45,000us-gaap_PaymentsForDerivativeInstrumentFinancingActivities                            
Direct financing cost     500,000us-gaap_PaymentsOfFinancingCosts                            
Deferred cost     246,653us-gaap_PaymentsOfDebtIssuanceCosts                            
Recorded expenses     253,347us-gaap_PaymentsOfLoanCosts                            
Interest expense     279,070us-gaap_InterestExpenseDebt 2,146,182us-gaap_InterestExpenseDebt                          
Oceanica Resources S. de. R.L [Member]                                  
Debt Instrument [Line Items]                                  
Per share value of shares purchased by private investor     $ 2.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember		                            
Scenario, Previously Reported [Member]                                  
Debt Instrument [Line Items]                                  
Warrant exercise price     $ 4.32us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		                            
Restatement Adjustment [Member]                                  
Debt Instrument [Line Items]                                  
Adjusted warrants exercise price     3.60omex_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember		                            
Revolving Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate           5.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                      
Maturity date     May 31, 2015                            
Credit facility agreement           10,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                      
Interest rate description     One month LIBOR rate plus 500 basis points                            
Origination fee payable           50,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                      
Restricted cash deposit           500,000us-gaap_RestrictedCashAndInvestments
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                      
Outstanding loan balance     7,684,514us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                            
First Mortgage [Member]                                  
Debt Instrument [Line Items]                                  
Company's consolidated debt     543,209us-gaap_LongTermDebt
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		                            
Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate   5.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		                              
Debt instrument description     One month LIBOR rate plus 500 basis points                            
Maturity date     Jul. 31, 2016                            
Periodic payment   500,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		                              
Balance of term loan     4,000,000us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		                            
Project Term Loans [Member]                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate     5.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Debt instrument description     One-month LIBOR rate plus 500 basis points                            
Maturity date     Jul. 24, 2014                            
Balance of term loan     10,000,000us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Aggregate amount issuable     10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		               10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		 10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		          
Number of wholly owned subsidiaries     2omex_NumberOfWhollyOwnedSubsidiaries
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Debt instrument, number of shares     100,000us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Debt instrument, Value of shares     250,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Amortization of components included in interest expense     316,920omex_AmortizationOfFinancingCostsIncludedInInterestExpense
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Marketing program compensation expenses, percentage yet to be recognized     5.00%omex_MarketingFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Restricted cash deposit     500,000us-gaap_RestrictedCashAndInvestments
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Company's consolidated debt   10,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                              
Loan origination fee paid at closing     50,000us-gaap_LoanProcessingFee
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                            
Loss recovered   1,800,000omex_WeightOfSilverBullionRecovered
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                              
Project Term Loans [Member] | Minimum [Member]                                  
Debt Instrument [Line Items]                                  
Initial principal amount of note, percent     50.00%omex_DebtInstrumentPercentageOfPrincipalAmountIssuedToInitialLenders
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                            
Project Term Loans [Member] | Maximum [Member]                                  
Debt Instrument [Line Items]                                  
Initial principal amount of note, percent     100.00%omex_DebtInstrumentPercentageOfPrincipalAmountIssuedToInitialLenders
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                            
Project Term Loans [Member] | Oceanica Resources S. de. R.L [Member]                                  
Debt Instrument [Line Items]                                  
Shares issued to lender     100,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember		                            
Per share value of shares purchased by private investor     $ 3.15us-gaap_SaleOfStockPricePerShare
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember		                            
Aggregate value of shares issued to lender     1,000,000us-gaap_SaleOfStockConsiderationReceivedPerTransaction
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember		                            
Project Term Loans [Member] | Gairsoppa [Member]                                  
Debt Instrument [Line Items]                                  
Project term loan collateral value   10,000,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_CounterpartyNameAxis
= omex_GairsoppaMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		                              
Project Term Loans [Member] | First Tranche [Member]                                  
Debt Instrument [Line Items]                                  
Loan amount borrowed                     5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= omex_TrancheOneMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		            
Project Term Loans [Member] | Second Tranche [Member]                                  
Debt Instrument [Line Items]                                  
Unused borrowing capacity                     2,500,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_DebtInstrumentAxis
= omex_TrancheTwoMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		            
Aggregate amount issuable                         2,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= omex_TrancheTwoMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		        
Interest rate, stated percentage                         8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= omex_TrancheTwoMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		        
Project Term Loans [Member] | Second Tranche [Member] | Scenario, Forecast [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate, stated percentage                           11.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= omex_TrancheTwoMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		      
Project Term Loans [Member] | Third Tranche Member]                                  
Debt Instrument [Line Items]                                  
Unused borrowing capacity                     2,500,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_DebtInstrumentAxis
= omex_TrancheThreeMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		            
Aggregate amount issuable                             2,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= omex_TrancheThreeMember
/ us-gaap_LongtermDebtTypeAxis
= omex_ProjectTermLoanMember		    
Senior Convertible Notes [Member]                                  
Debt Instrument [Line Items]                                  
Aggregate amount issuable             10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                    
Warrants issued to purchase common stock             1,302,083omex_MaximumIssueOfWarrantsToPurchaseCommonStock
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                    
Original principal amount of repurchased note             5,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                    
Debt related expenses     545,000us-gaap_DebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                            
Number of institutional investors under securities purchase agreement             1omex_NumberOfInstitutionalInvestorUnderSecuritiesPurchaseAgreement
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                    
Indebtedness, interest rate per year     8.00%omex_IndebtednessInterestRatePerYear
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                            
Indebtedness, interest rate per year under default condition     15.00%omex_IndebtednessInterestRatePerYearUnderDefaultCondition
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                            
Original principal installments     434,783omex_DebtInstrumentOriginalPrincipalPayment
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                            
Note repayment commencing date     Jul. 08, 2012                            
Debt instrument conversion price, percentage     110.00%omex_PercentageOfDebtInstrumentConversionPriceOnMarketPriceOfCommonStock
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		                            
Initial conversion price                   $ 3.17us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember		              
Debt instrument amortization payment description     The conversion rate applicable to any amortization payment that were made in shares of our common stock was the lower of (a) the Conversion Price and (b) a price equal to 85.0% of the average for a ten-day period immediately prior to the applicable amortization date of the volume-weighted average price of our shares of common stock.                            
Senior Convertible Notes [Member] | Lender [Member]                                  
Debt Instrument [Line Items]                                  
Debt related expenses     45,000us-gaap_DebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNotesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= omex_LenderMember		                            
Additional Note [Member]                                  
Debt Instrument [Line Items]                                  
Loan amount borrowed     2,347,826us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Aggregate amount issuable                   8,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		              
Interest rate, stated percentage                   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		              
Initial conversion price                   $ 3.74us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		           $ 3.17us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		  
Debt instrument amortization payment description     The conversion rate applicable to any amortization payment made in shares of our common stock was the lower of (a) the Conversion Price and (b) a price equal to 85.0% of the average for a ten-day period immediately prior to the applicable amortization date of the volume-weighted average price of our shares of common stock.                            
Volume-weighted average price, percentage     85.00%omex_PercentageOfConversionPriceEqualToVolumeWeightedAveragePrice
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Conversion price applicable period     10 days                            
Common stock issued under warrant terms     1,562,500omex_SharesOfCommonStockIssuableUponExerciseOfWarrant
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Maximum percentage of cash flow effect on present value basis                               10.00%omex_MaximumPercentageOfCashFlowEffectOnPresentValueBasis
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		  
Percentage of carrying value of additional note to determine change in fair value of embedded conversion option                               10.00%omex_PercentageOfCarryingValueOfAdditionalNoteToDetermineChangeInFairValueOfEmbeddedConversionOption
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		  
Principal amount of loan, paid in cash     1,739,130us-gaap_RepaymentsOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Gross proceeds from derivative instrument     8,000,000us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Investment costs paid from proceeds     5,518us-gaap_PaymentsForDerivativeInstrumentFinancingActivities
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Direct financing cost     400,000us-gaap_PaymentsOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Deferred cost     317,201us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Recorded expenses     82,799us-gaap_PaymentsOfLoanCosts
/ us-gaap_LongtermDebtTypeAxis
= omex_AdditionalNotesMember		                            
Mortgages Payable [Member]                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                  
Maturity date     Jul. 11, 2013           May 14, 2015                
Periodic payment                 5,080us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                
Interest rate, stated percentage                 6.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                
Interest rate description     Prime rate plus three-fourths of one percent (0.75%)                            
Company's consolidated debt     1,119,250us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                           2,580,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Periodic payments, principal     10,750us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                            
New maturity date of mortgage loan     Jul. 31, 2016                            
Mortgages Payable [Member] | First Mortgage [Member]                                  
Debt Instrument [Line Items]                                  
Loan amount borrowed                 679,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		                
Senior Convertible Note [Member]                                  
Debt Instrument [Line Items]                                  
Debt instrument conversion, reset conversion price description     The reset conversion price applicable to the Initial Note was to be adjusted to the lesser of (a) the then current conversion price and (b) the greater of (i) $1.44 and (ii) 110.0% of the market price of our common stock on the six-month anniversary of the initial closing date (as applicable, the "Conversion Price").                            
Debt instrument conversion price     $ 1.44us-gaap_DebtInstrumentConvertibleStockPriceTrigger
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember		                            
Debt instrument conversion price, percentage     110.00%omex_PercentageOfDebtInstrumentConversionPriceOnMarketPriceOfCommonStock
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember		                            
Initial conversion price     $ 3.74us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember		                            
Volume-weighted average price, percentage     85.00%omex_PercentageOfConversionPriceEqualToVolumeWeightedAveragePrice
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember		                            
Conversion price applicable period     10 days                            
Common shares issued as payment in outstanding principal       3,282,934omex_CommonStockSharesIssuedAsPaymentRelatedToOutstandingPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember		                          
Principal amount outstanding       8,608,694omex_DebtInstrumentPrincipalAmountRedeemed
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember		                          
Principal payment     $ 1,391,306omex_DebtInstrumentPrincipalPayments
/ us-gaap_LongtermDebtTypeAxis
= omex_SeniorConvertibleNoteMember