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Concentration of Credit Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) Institution	Dec. 31, 2018 USD ($)
Debt Disclosure [Abstract]
Uninsured cash balance	$ 16,000	$ 2,600,000
Number of financial institutions in which cash is deposited | Institution	1
Amount of loan outstanding with variable interest rate	$ 0

X

- Definition

Number of financial institutions in which cash deposited.

+ References

No definition available.

+ Details

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Namespace Prefix:	omex_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of loan with variable or adjustable rate of interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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