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Loans Payable - Note 2 - Monaco 2016 - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 10, 2015 | Jul. 31, 2020 | Mar. 31, 2018 | Mar. 31, 2016 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2017 | Apr. 01, 2018 | Oct. 01, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Conversion price of Notes |  | $ 3.71 |  |  |  |  |  |  |  |  |  |
Loans payable |  |  |  |  | $ 38,557,682 |  | $ 38,557,682 |  | $ 34,403,486 |  |  |
Debt instrument, number of shares |  | 30,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, value of shares |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Marine Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of vessel |  |  |  |  |  |  |  |  |  | $ 650,000 |  |
Loan Modification [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes |  |  |  |  |  |  |  |  | $ 1.00 |  |  |
Loans payable |  |  |  |  |  |  |  |  | $ 2,800,000 |  |  |
Loan Modification [Member] | First Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Agreement description |  |  |  |  |  |  | Monaco agreed to cease interest as of December 10, 2015 and reduce the loan balance by (i) the cash or other value received from the SS Central America shipwreck project (“SSCA”) or (ii) if the proceeds received from the SSCA project were insufficient to pay off the loan balance by December 31, 2017, then Monaco could seek repayment of the remaining outstanding balance on the loan by withholding Odyssey’s 21.25% “additional consideration” in new shipwreck projects performed for Monaco in the future. |  |  |  |  |
Additional consideration percentage | 21.25% |  |  |  |  |  |  |  |  |  |  |
Loan Modification [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date | Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Reduced principal amount | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |
Loan Modification [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date | Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Loan Modification [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity component in loans payable |  |  |  |  |  |  |  |  | $ 3,174,603 |  |  |
Debt instrument, number of shares |  |  |  |  |  |  |  |  | 3,174,603 |  |  |
Debt instrument, value of shares |  |  |  |  |  |  |  |  | $ 3,174,603 |  |  |
Loan Modification [Member] | Monaco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of options eliminated under share purchase option |  |  |  |  |  |  |  |  | 3,174,603 |  |  |
Per share value of shares purchased by private investor |  |  |  |  |  |  |  |  | $ 3.15 |  |  |
Note 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  | $ 1,825,000 |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 10.00% |  |  |  |  |  |  |  |
Outstanding notes balance |  |  |  |  | 1,175,000 |  | $ 1,175,000 |  | $ 1,175,000 |  |  |
Loans payable, repayment |  |  |  |  |  |  |  |  |  | $ 650,000 |  |
BCF amount recorded |  |  | $ 456,250 |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  | $ 66,721 | $ 66,721 | $ 133,442 | $ 132,709 |  |  |  |
Debt default interest rate |  |  |  |  |  |  |  |  | 18.00% |  | 18.00% |
Note 2 [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes |  |  |  | $ 1.00 |  |  |  |  |  |  |  |
Note 2 [Member] | Exploraciones Oceanicas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |
Note 2 [Member] | Oceanica Marine Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  | $ 9,300,000 |  |  |  |  |  |  |  |
Debt instrument term |  |  |  | 30 days |  |  |  |  |  |  |  |
Aggregate consideration payable |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |
Installment amount of Notes |  |  |  | 750,000 |  |  |  |  |  |  |  |
Equipment carrying value |  |  |  | $ 100,000 |  |  |  |  |  |  |  |

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