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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
	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	$ 3.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	$ 3.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	$ 3.60us-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	$ 1.04invest_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	$ 1.07invest_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	$ 1.74invest_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	$ 2.20invest_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	$ 2.73invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointSevenThreeMember	$ 2.73invest_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	$ 2.74invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointSevenFourMember	$ 2.74invest_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	$ 2.89invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfTwoPointEightNineMember	$ 2.89invest_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	$ 3.25invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointTwoFiveMember	$ 3.25invest_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	$ 3.40invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFourZeroMember	$ 3.40invest_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	$ 3.43invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFourThreeMember	$ 3.43invest_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	$ 3.50invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointFiveZeroMember	$ 3.50invest_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	$ 3.9invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfThreePointNineZeroMember	$ 3.9invest_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	$ 4.00invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfFourPointZeroZeroMember	$ 4.00invest_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		$ 7.00invest_InvestmentOptionsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = omex_StockOptionsWithExercisePriceOfSevenPointZeroZeroMember

X

- Definition

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+ 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

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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

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