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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share for Out of Money Potential Common Shares (Parenthetical) (Detail) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014 | May 10, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Warrants exercise price per share | $ 3.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 3.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 3.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Stock Options With an Exercise Price of $1.04 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 1.04 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfOnePointZeroFourMember |  |
Stock Options With Exercise Price Of One Point Zero Seven First [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 1.07 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfOnePointZeroSevenFirstMember |  |
Stock Options With an Exercise Price of $1.74 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 1.74 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfOnePointSevenFourMember |  |
Stock Options With an Exercise Price of $2.20 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 2.20 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointTwoZeroMember |  |
Stock Options With an Exercise Price of $2.73 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 2.73 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointSevenThreeMember | $ 2.73 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointSevenThreeMember |
Stock Options With an Exercise Price of $2.74 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 2.74 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointSevenFourMember | $ 2.74 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointSevenFourMember |
Stock Options With an Exercise Price of $2.89 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 2.89 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointEightNineMember | $ 2.89 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointEightNineMember |
Stock Options With an Exercise Price of $3.25 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 3.25 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointTwoFiveMember | $ 3.25 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointTwoFiveMember |
Stock Options With an Exercise Price of $3.40 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 3.40 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFourZeroMember | $ 3.40 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFourZeroMember |
Stock Options With an Exercise Price of $3.43 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 3.43 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFourThreeMember | $ 3.43 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFourThreeMember |
Stock Options With an Exercise Price of $3.50 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 3.50 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFiveZeroMember | $ 3.50 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFiveZeroMember |
Stock Options With an Exercise Price of $3.90 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 3.9 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointNineZeroMember | $ 3.9 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointNineZeroMember |
Stock Options With an Exercise Price of $4.00 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 4.00 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfFourPointZeroZeroMember | $ 4.00 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfFourPointZeroZeroMember |
Stock Options With an Exercise Price of $7.00 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share |  | $ 7.00 invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfSevenPointZeroZeroMember |

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- Definition Exercise price of the option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Footnote 5 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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