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Other Current Assets - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other Assets Current [Line Items] |  |
Prepaid expenses | $ 478,560 | $ 471,686
Directors and Officers Insurance [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | 388,137 | 316,795
Marine Insurance [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | 40,119 | 67,447
Professional Services [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | 38,674 | 75,784
Other Insurances [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | $ 11,630 | $ 11,660

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