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Other Debt - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Trade payable, interest bearing interest rate		12.00%
Trade payable in accounts payable		$ 700,000
Collateral asset carrying value		$ 0
Proceeds from sale of marine equipment			$ 1,003,662	$ 80,000
Magellan Offshore Services Ltd [Member] | Marine Equipment [Member]
Debt Instrument [Line Items]
Proceeds from sale of marine equipment	$ 1,000,000
Gain recognized from sale of marine equipment	900,000
Contingent liability	$ 500,000
Collateral Agreement [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		Aug. 31, 2018

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