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Deferred Income - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue, current | $ 5,191,654 | $ 4,432,056 | $ 4,362,056
Time and Bareboat Deferred Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue, current | $ 5,191,654 |  | $ 4,366,091

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