Description of Business - Additional Information (Detail) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Net loss	$ 2,776,571	$ 3,286,934	$ 3,801,993	$ 2,788,118	$ 2,565,327	$ 2,598,060	$ 9,865,498	$ 7,951,505
Accumulated deficit	65,991,480						65,991,480		$ 56,125,982
Cash used in operating activities							7,878,816	$ 7,697,702
Remaining capital amount under shelf registration	$ 9,800,000						$ 9,800,000