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Concentration of Credit Risk - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2016 USD ($) Institution
Debt Disclosure [Abstract] |
Uninsured cash balance | $ 1,622,296
Number of financial institutions in which cash is deposited | Institution | 1
Debt obligations with variable interest rates | $ 0

X
- Definition Number of financial institutions in which cash deposited. + References No definition available. + Details
Name: | omex_NumberOfFinancialInstitutionsInWhichCashDeposited
Namespace Prefix: | omex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant