XML 67 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1

Concentration of Credit Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) Institution	Dec. 31, 2016 USD ($)
Debt Disclosure [Abstract]
Uninsured cash balance	$ 800,000	$ 1,500,000
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

Name:	omex_NumberOfFinancialInstitutionsInWhichCashDeposited
Namespace Prefix:	omex_
Data Type:	xbrli:integerItemType
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
Period Type:	duration

X

- Definition

Amount of loan with variable or adjustable rate of interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansReceivableWithVariableRatesOfInterest1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant