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Loans Payable - Note 2 - Monaco 2016 - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 10, 2015 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2016 USD ($) Installment $ / shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2020 USD ($) | Apr. 01, 2018 | Oct. 01, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000.0
Conversion price of Notes | $ / shares |  |  |  | $ 4.67 |  | $ 4.67 |  |  |  |  |  |
Loans payable |  |  |  | $ 43,932,595 |  | $ 43,932,595 |  |  |  | $ 42,593,268 |  |
Gain (loss) on debt extinguishment |  |  |  |  |  |  |  | $ (290,024) |  |  |  |
Second Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date | Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Third Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date | Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |
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 | $ / shares |  |  |  | $ 1.00 |  | $ 1.00 |  |  |  |  |  |
Loans payable |  |  |  | $ 2,800,000 |  | $ 2,800,000 |  |  |  |  |  |
Gain (loss) on debt extinguishment |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable | 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Reduced principal amount | 2,200,000 |  |  |  |  |  |  |  |  |  |  |
Loan Modification [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Loan Modification [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  | Dec. 31, 2017 |  |  |  |  |  |
Equity component in loans payable |  |  |  | $ 3,174,603 |  | $ 3,174,603 |  |  |  |  |  |
Debt instrument, number of shares | 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 | shares |  |  |  | 3,174,603 |  | 3,174,603 |  |  |  |  |  |
Per share value of shares purchased by private investor | $ / shares |  |  |  | $ 3.15 |  | $ 3.15 |  |  |  |  |  |
Note 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  | $ 1,825,000 |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 10.00% |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Apr. 15, 2018 |  |  |  |  |  |  |  |  |
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 | $ 132,709 | $ 133,442 |  |  |  |  |
Debt default interest rate |  |  |  | 18.00% |  | 18.00% |  |  |  |  | 18.00% |
Note 2 [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  |  | $ 1.00 |  |  |  |  |  |  |  |  |
Note 2 [Member] | Exploraciones Oceanicas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  | $ 18,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 25, 2015 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Debt instrument number of installments | Installment |  |  | 10 |  |  |  |  |  |  |  |  |
Installment amount of Notes |  |  | $ 750,000 |  |  |  |  |  |  |  |  |
Equipment carrying value |  |  | $ 100,000 |  |  |  |  |  |  |  |  |

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