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Commitments and Contingencies - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 09, 2015
Mar. 31, 2015
Mar. 11, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Gain Contingencies [Line Items]            
Minimum bid price $ 1.00omex_CommonStockMinimumBidPrice          
Number of consecutive business days not complied with minimum bid price 30 days          
Number of days afforded to regain compliance with minimum bid price requirement 180 days          
Cash and cash equivalents   $ 704,452us-gaap_CashAndCashEquivalentsAtCarryingValue   $ 3,143,550us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,767,721us-gaap_CashAndCashEquivalentsAtCarryingValue $ 21,322,257us-gaap_CashAndCashEquivalentsAtCarryingValue
Working capital deficit   13,500,000omex_WorkingCapitalDeficit        
Bank loan amount   7,700,000us-gaap_BankLoans        
Bank loan maturity period   2015        
Total assets   21,076,649us-gaap_Assets   25,089,539us-gaap_Assets    
Minosa [Member]            
Gain Contingencies [Line Items]            
Amount of debt financed     14,750,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= omex_MinosaMember		      
Penelope Mining LLC [Member]            
Gain Contingencies [Line Items]            
Investment in convertible preferred stock     $ 101,000,000omex_MaximumAmountOfFinancingAvailableFromFutureIssuanceOfConvertiblePreferredStock
/ us-gaap_CounterpartyNameAxis
= omex_PenelopeMiningLlcMember		      
Investment agreement period     3 years