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Loans Payable - Note 12 - Vendor note payable - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Trade payable, interest bearing interest rate |  | 12.00% |  | 12.00% |  |
Trade payable in accounts payable |  | $ 484,009 |  | $ 484,009 |  |
Collateral asset carrying value |  | 0 |  | 0 |  |
Interest Expense |  | 2,629,253 | $ 1,561,697 | 5,009,729 | $ 2,897,315 |
Accrued Interest |  | 22,634,452 |  | 22,634,452 |  | $ 15,800,317
Magellan Offshore Services Ltd [Member] |  |  |  |  |  |
Trade payable in accounts payable |  | 484,009 |  | 484,009 |  | $ 484,009
Interest Expense |  | 14,322 | $ 14,480 | 28,803 | $ 28,961 |
Magellan Offshore Services Ltd [Member] | Minimum [Member] |  |  |  |  |  |
Contingent liability |  | $ 300,000 |  | $ 300,000 |  |
Magellan Offshore Services Ltd [Member] | Marine Equipment [Member] |  |  |  |  |  |
Proceeds from sale of marine equipment | $ 1,000,000.0 |  |  |  |  |
Contingent liability | $ 500,000 |  |  |  |  |
Collateral Agreement [Member] |  |  |  |  |  |
Debt instrument maturity date |  |  |  | Aug. 31, 2018 |  |

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