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Significant Accounting Policies - Schedule of Impact of Adoption of ASU 2014-09 on Consolidated Balance Sheet and Consolidated Statement of Operations (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Current Assets |  |  |  |
Trade and other receivables | $ 2,888,496 | $ 3,853,992 |  | $ 3,286,147
Other current assets | 134,301 |  |  | $ 293,664
Liabilities |  |  |  |
Payable to related party | 7,930,642 | 14,209,624 |  |
Accrued and other liabilities | 6,879,488 | 5,880,479 |  |
Total revenues | 164,330,202 | 152,338,278 | $ 136,539,399 |
Voyage expenses | 18,649,258 | 13,804,032 | 13,618,025 |
Voyage expenses - related party | 2,037,917 | 1,912,505 | 1,772,240 |
Net loss | $ (12,276,520) | (1,218,237) | $ (7,798,300) |
Basic earnings per share | $ (0.31) |  |  |
Diluted earnings per share | $ (0.31) |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |
Current Assets |  |  |  |
Trade and other receivables |  | (567,845) |  |
Other current assets |  | $ 293,664 |  |
Accounting Standards Update 2014-09 [Member] | Balances without adoption of ASU 2014-09 [Member] |  |  |  |
Current Assets |  |  |  |
Trade and other receivables | $ 2,941,191 |  |  |
Liabilities |  |  |  |
Payable to related party | 7,931,297 |  |  |
Accrued and other liabilities | 6,880,536 |  |  |
Total revenues | 163,744,736 |  |  |
Voyage expenses | 18,498,600 |  |  |
Voyage expenses - related party | 2,030,599 |  |  |
Net loss | $ (12,704,010) |  |  |
Basic earnings per share | $ (0.32) |  |  |
Diluted earnings per share | $ (0.32) |  |  |
Accounting Standards Update 2014-09 [Member] | Effect of change [Member] |  |  |  |
Current Assets |  |  |  |
Trade and other receivables | $ (52,695) |  |  |
Other current assets | 134,301 |  |  |
Liabilities |  |  |  |
Payable to related party | (655) |  |  |
Accrued and other liabilities | (1,048) |  |  |
Total revenues | (585,466) |  |  |
Voyage expenses | 150,658 |  |  |
Voyage expenses - related party | 7,318 |  |  |
Net loss | $ (427,490) |  |  |
Basic earnings per share | $ (0.01) |  |  |
Diluted earnings per share | $ (0.01) |  |  |

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