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v3.10.0.1

Other Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |
Trade payable, interest bearing interest rate | 12.00% | 12.00% |
Trade payable in accounts payable | $ 600,000 | $ 600,000 |
Collateral asset carrying value | 0 | 0 |
Proceeds from sale of marine equipment |  | 1,003,662 | $ 50,000
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 | $ 500,000 |
Collateral Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date |  | Aug. 31, 2018 |

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