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Other Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |
Trade payable, interest bearing interest rate |  | 12.00% |
Trade payable in accounts payable |  | $ 600,000 |
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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