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Consolidated Statements of Changes in Stockholders' Equity / (Deficit) (USD $)
Total
Series D Convertible Preferred Stock [Member]
Common Stock [Member]
Paid-in Capital [Member]
Accumulated Deficit [Member]
Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2011   $ 21us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
$ 7,309us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 137,236,462us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (147,018,753)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Beginning Balance, Shares at Dec. 31, 2011   206,400us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
73,095,384us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for cash, shares     511,650us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for settlement of senior convertible notes, Shares     1,441,013us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for services, shares     368,156us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Total stockholders' equity/(deficit) (20,758,729)us-gaap_StockholdersEquity   7,542us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
144,446,574us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(165,212,866)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Common stock issued for settlement of senior convertible notes     144us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
4,262,383us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Net (loss) (18,184,113)us-gaap_NetIncomeLoss       (18,184,113)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Common stock issued for services     37us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
347,516us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Dividends         (10,000)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Common stock issued for cash     52us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,110,419us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Share-based compensation       1,489,794us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Ending Balance at Dec. 31, 2012 (20,758,729)us-gaap_StockholdersEquity   7,542us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
144,446,574us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(165,212,866)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Ending Balance, Shares at Dec. 31, 2012     75,416,203us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for settlement of senior convertible notes, Shares     2,010,500us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Ending Balance at Mar. 31, 2013            
Beginning Balance at Dec. 31, 2012 (20,758,729)us-gaap_StockholdersEquity 21us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
7,542us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
144,446,574us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(165,212,866)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Beginning Balance, Shares at Dec. 31, 2012   206,400us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
75,416,203us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Preferred stock converted to common, Share   (174,000)omex_PreferredStockConvertedToCommonShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
174,000omex_PreferredStockConvertedToCommonShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for cash, shares     4,392,540us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for settlement of senior convertible notes, Shares     3,552,357us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for services, shares     347,477us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Total stockholders' equity/(deficit) 13,206,790us-gaap_StockholdersEquity 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
8,388us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
193,272,576us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(175,954,138)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(4,120,037)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common stock issued for settlement of senior convertible notes     355us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,279,887us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Preferred stock converted to common   (18)omex_PreferredStockConvertedToCommon
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
18omex_PreferredStockConvertedToCommon
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net (loss) (10,741,272)us-gaap_NetIncomeLoss       (10,741,272)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(4,120,037)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common stock issued for services     35us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for cash     438us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
10,360,895us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Share-based compensation       2,617,278us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Sale of subsidiary stock 625,000omex_StockIssuedDuringPeriodValueSaleOfSubsidiaryStock     27,500,000omex_StockIssuedDuringPeriodValueSaleOfSubsidiaryStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Purchase of subsidiary stock       (1,250,000)omex_AdjustmentsToAdditionalPaidInCapitalSubsidiaryStockRepurchase
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Settlement of vendor payable with subsidiary stock       625,000omex_AdjustmentsToAdditionalPaidInCapitalSettlementOfVendorPayableWithSubsidiaryStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Retained earnings of subsidiary acquisition       (307,059)omex_AdjustmentsToAdditionalPaidInCapitalRetainedEarningsOfSubsidiaryAcquisition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Ending Balance at Dec. 31, 2013 13,206,790us-gaap_StockholdersEquity 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
8,388us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
193,272,576us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(175,954,138)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(4,120,037)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Ending Balance, Shares at Dec. 31, 2013   32,400us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
83,882,577us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Beginning Balance at Sep. 30, 2013            
Common stock issued for settlement of senior convertible notes, Shares     1,725,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Total stockholders' equity/(deficit)     8,388us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Ending Balance at Dec. 31, 2013 13,206,790us-gaap_StockholdersEquity   8,388us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
193,272,576us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(175,954,138)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(4,120,037)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Ending Balance, Shares at Dec. 31, 2013     83,882,577us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for settlement of senior convertible notes, Shares     1,290,155us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock issued for services, shares     409,770us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Total stockholders' equity/(deficit) (10,404,472)us-gaap_StockholdersEquity 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
8,558us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
198,323,630us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(202,427,252)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(6,309,411)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common stock issued for settlement of senior convertible notes     129us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,420,734us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Net (loss) (26,473,114)us-gaap_NetIncomeLoss       (26,473,114)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(2,189,374)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common stock issued for services     41us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Share-based compensation       2,380,320us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Settlement of financing fee with subsidiary stock       250,000omex_AdjustmentsToAdditionalPaidInCapitalSettlementOfFinancingFeeWithSubsidiaryStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Ending Balance at Dec. 31, 2014 $ (10,404,472)us-gaap_StockholdersEquity $ 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
$ 8,558us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 198,323,630us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (202,427,252)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (6,309,411)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Ending Balance, Shares at Dec. 31, 2014   32,400us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
85,582,502us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember