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Subsequent Event - Additional Information (Detail) - USD ($) | Oct. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
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Subsequent Event [Line Items] |  |  |
Common stock sold |  | 8,466,909 | 8,466,909
Warrants exercise price per share |  | $ 3.52 |
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common stock sold | 700,000 |  |
Common stock called by warrants | 700,000 |  |
Purchase price per unit | $ 7.155 |  |
Warrants exercise price per share | $ 7.155 |  |
Net proceeds from public offering | $ 4,600,000 |  |
Placement agent fee, percentage of gross proceeds | 8.00% |  |
Reimbursement of costs related to public offering | $ 25,000 |  |

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- Definition Placement agent fee percentage. + References No definition available. + Details
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- Definition Reimbursement of costs + References No definition available. + Details
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Namespace Prefix: | omex_
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Balance Type: | debit
Period Type: | duration

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Period Type: | instant

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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