Net Loss Per Share - Summary of Basic and Diluted Net Income (Loss) Per Common Share (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (2,750,362)	$ (2,843,996)	$ (2,778,485)	$ (2,375,514)	$ (5,594,358)	$ (5,153,999)
Less: cumulative preferred dividends earned in the period	(482,662)	$ (477,358)	(279,786)	$ (279,786)	(960,020)	(559,573)
Net loss available for distribution to common stockholders	$ (3,233,024)		$ (3,058,271)		$ (6,554,378)	$ (5,713,572)
Denominator:
Net loss per share, basic and diluted	$ (0.66)		$ (0.65)		$ (1.34)	$ (1.21)
Weighted average shares outstanding, basic and diluted	4,921,121		4,725,083		4,880,496	4,721,313