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Loans Payable - Note 4 - Epsilon - Additional Information (Detail) $ / shares in Units, Cuota in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2021 shares | Aug. 10, 2017 USD ($) | Mar. 21, 2017 USD ($) shares | Dec. 15, 2016 $ / shares shares | Nov. 15, 2016 $ / shares shares | Oct. 16, 2016 $ / shares shares | Oct. 01, 2016 USD ($) d $ / shares shares | Mar. 18, 2016 USD ($) Cuota d $ / shares | Nov. 30, 2020 shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Jun. 30, 2017 USD ($) shares | Jun. 30, 2021 USD ($) Cuota d $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) shares | Aug. 21, 2020 $ / shares shares | Sep. 30, 2019 USD ($) | Jan. 25, 2017 USD ($) | Mar. 17, 2016 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  |  |  |  |  |  |  |  | $ 4.67 |  |  | $ 4.67 |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |
Common stock purchase warrant | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,901,985 |  |  |
Warrant right exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.75 |  |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  |  | 13,023,330 |  |  | 13,023,330 |  |  |  | 12,591,084 |  |  |  |
Epsilon Acquisitions, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  |  |  |  |  | $ 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  |  |  |  |  |  |  |  | $ 3.52 |  |  | $ 3.52 |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  | $ 0 | $ 24,931 |  | $ 34,520 | $ 49,862 |  |  |  |  |  |  |
Conversion of stock, shares Issued | shares | 411,562 |  |  |  |  |  |  |  |  |  |  |  | 411,562 |  |  |  |  |  |  |  |
Aggregate fair value of warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ 303,712 |  |  |  |  |  |  |  |
Inducement expense |  |  |  |  |  |  |  |  |  |  |  |  | 303,712 |  |  |  |  |  |  |  |
Conversion of stock, amount converted |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,448,697 |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  |  |  |  | $ 3.52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares Issued | shares |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Fourth Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  |  |  | $ 4.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares Issued | shares |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Fifth Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  |  | $ 4.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares Issued | shares |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | MINOSA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  |  |  |  |  | 14,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, acceleration clause description |  |  |  |  |  |  |  |  |  |  |  |  | The indebtedness may be accelerated upon the occurrence of specified events of default including (a) OME’s failure to pay any amount payable on the date due and payable; (b) OME or we fail to perform or observe any term, covenant, or agreement in the Purchase Agreement or the related documents, subject to a five-day cure period; (c) an event of default or material breach by OME, us or any of our affiliates under any of the other loan documents shall have occurred and all grace periods, if any, applicable thereto shall have expired; (d) the Stock Purchase Agreement shall have been terminated; (e) specified dissolution, liquidation, insolvency, bankruptcy, reorganization, or similar cases or actions are commenced by or against OME or any of its subsidiaries, in specified circumstances unless dismissed or stayed within 60 days; (f) the entry of judgment or award against OME or any of its subsidiaries in excess or $100,000; and (g) a change in control (as defined in the Purchase Agreement) occurs. |  |  |  |  |  |  |  |
Judgment amount for acceleration of indebtedness |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  | $ 6,000,000.0 |  |  |  | $ 3,000,000.0 | 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |
Installment amount of Notes |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Notes security description |  |  |  |  |  |  |  |  |  |  |  |  | we granted security interests to Epsilon in (a) the 54 million cuotas (a unit of ownership under Panamanian law) of Oceanica Resources S. de R.L. (“Oceanica”) held by our wholly owned subsidiary, Odyssey Marine Enterprises, Ltd. (“OME”), (b) all notes and other receivables from Oceanica and its subsidiary owed to the Odyssey Pledgors, and (c) all of the outstanding equity in OME. |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  |  |  |  |  | $ 5.00 | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.00
Conversion price of Notes upon default | $ / shares |  |  |  |  |  |  |  | $ 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  | Mar. 18, 2017 | Mar. 18, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged units of ownership | Cuota |  |  |  |  |  |  |  | 54 |  |  |  |  | 54 |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  | 75 | 75 |  |  |  |  |  |  |  |  |  |  |  |  |
Lender's out of pocket costs |  |  |  |  |  |  |  |  |  | 50,000 |  |  | $ 50,000 |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  | $ 302,274 |  |  |  |  |  |  |  |  |
Conversion of stock, shares Issued | shares |  |  | 670,455 |  |  |  |  |  |  |  |  | 670,455 |  |  |  |  |  |  |  |  |
Beneficial conversion feature recorded |  |  |  |  |  |  |  |  |  |  |  |  | $ 96,000 |  |  |  |  |  |  |  |
Debt conversion amount |  | $ 2,000,000.0 | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |
Common stock purchase warrant | shares |  |  |  |  |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant right exercise price | $ / shares |  |  |  |  |  |  | $ 3.52 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Expiration Date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2021 |  |  |  |  |  |  |  |
Warrant right exercise price description |  |  |  |  |  |  |  |  |  |  |  |  | Warrant shall be the number determined by multiplying 120,000 by a fraction, (a) the numerator of which is the aggregate principal amount of advances that have been extended to the OME by Epsilon pursuant to the Restated Note Purchase Agreement on or after the date of the Warrant and prior to the date of such failure and (b) the denominator of which is $3.0 million. |  |  |  |  |  |  |  |
Equity component in loans payable |  |  | 3,000,000.0 |  |  |  |  |  |  | 3,000,000.0 |  |  | $ 3,000,000.0 |  |  | $ 3,000,000.0 |  |  | $ 3,000,000.0 |  |
Amount of loan outstanding |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  | $ 1,000,000.0 |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  | 56,228 |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited | shares |  |  |  |  |  |  |  |  | 63,772 |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  | $ 6,050,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] | Maximum [Member] | Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares Issued | shares |  |  |  |  |  |  | 1,388,769 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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