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Earnings/(loss) per share - Basic and Diluted Earnings Per Share Calculation (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss)/income	$ 11,984,485	$ 2,093,124	$ (12,276,520)
Less: Undistributed earnings allocated to non-vested shares	0	(8,922)	0
Net (loss)/income attributable to common shareholders, basic	$ 11,984,485	$ 2,084,202	$ (12,276,520)
Weighted average number of shares outstanding, basic and diluted	38,357,893	39,800,434	39,860,563
(Loss)/earnings per share, basic and diluted	$ 0.31	$ 0.05	$ (0.31)

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