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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Parenthetical) (Detail)
May 10, 2012
Nov. 08, 2011
Dec. 31, 2014
Derivative [Line Items]      
Shares available for issuance upon exercise 434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing 434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing  
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Warrant Group 2 [Member]      
Derivative [Line Items]      
Shares available for issuance upon exercise     434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing
/ us-gaap_ClassOfWarrantOrRightAxis
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/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member