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Loans Payable - Note 2 - Monaco 2016 - Additional Information (Detail) - USD ($)		1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 10, 2015	Jul. 31, 2020	Mar. 31, 2018	Mar. 31, 2016	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 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			$ 4.86		$ 4.86
Loans payable					$ 40,176,610		$ 40,176,610		$ 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					$ 67,454	$ 67,454	$ 200,896	$ 200,165
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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