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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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