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Organization and Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Net loss									$ (26,473,114)us-gaap_NetIncomeLoss	$ (10,741,272)us-gaap_NetIncomeLoss	$ (18,184,113)us-gaap_NetIncomeLoss
Cumulative dividends on Series G Preferred Stock											(10,000)us-gaap_TemporaryEquityDividendsAdjustment
Numerator, basic and diluted net loss available to stockholders									$ (26,473,114)omex_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ (10,741,272)omex_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ (18,194,113)omex_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted
Shares used in computation - basic:
Weighted average common shares outstanding									84,870,635omex_SharesUsedInComputationForEarningPerShareBasic	80,128,827omex_SharesUsedInComputationForEarningPerShareBasic	73,889,112omex_SharesUsedInComputationForEarningPerShareBasic
Shares used in computation - diluted:
Weighted average common shares outstanding									84,870,635omex_SharesUsedInComputationForEarningPerShareDiluted	80,128,827omex_SharesUsedInComputationForEarningPerShareDiluted	73,889,112omex_SharesUsedInComputationForEarningPerShareDiluted
Net loss per share - basic and diluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.09)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.05)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.12)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.13us-gaap_EarningsPerShareBasicAndDiluted	$ (0.01)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.12)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.31)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.25)us-gaap_EarningsPerShareBasicAndDiluted

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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