Fair value assumptions quoted price.

No definition available.

Name:	omex_FairValueAssumptionsQuotedPrice
Namespace Prefix:	omex_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of shares purchased by agent in private placement.

+ References

No definition available.

+ Details

Name:	omex_PercentageOfSharesPurchasedByAgentInPrivatePlacement
Namespace Prefix:	omex_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Purchase Price

+ References

No definition available.

+ Details

Name:	omex_SharePurchasePrice
Namespace Prefix:	omex_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=omex_OceanicaResourcesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Parenthetical) (Detail) - $ / shares		1 Months Ended
	Mar. 31, 2016	Dec. 31, 2013	Sep. 30, 2017	Dec. 31, 2015	Dec. 01, 2014	Oct. 01, 2014	Aug. 14, 2014
Derivative [Line Items]
Underlying price on valuation date	$ 1.25	$ 2.50		$ 2.50	$ 2.50	$ 2.50	$ 2.50
New option price	1.00		$ 3.52
Purchase price of the share purchase options	$ 1.00
Oceanica Resources S. de. R.L [Member]
Derivative [Line Items]
Percentage of shares purchased by private investor		24.00%
Per share value of shares purchased by private investor		$ 2.50