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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
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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 |  |  |  |  |  |  |  |  | 84,870,635 omex_SharesUsedInComputationForEarningPerShareBasic | 80,128,827 omex_SharesUsedInComputationForEarningPerShareBasic | 73,889,112 omex_SharesUsedInComputationForEarningPerShareBasic
Shares used in computation - diluted: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 84,870,635 omex_SharesUsedInComputationForEarningPerShareDiluted | 80,128,827 omex_SharesUsedInComputationForEarningPerShareDiluted | 73,889,112 omex_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 | $ 0.13 us-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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