Net Income (Loss) per Share - Computation of Denominators Used in Net Loss per Share (Detail) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic:
Weighted average common shares outstanding - Basic	47,413,250	42,669,333	35,892,786
Diluted:
Weighted average common shares outstanding - Basic	47,413,250	42,669,333	35,892,786
Common stock equivalents	501,780	0	0
Denominator for diluted net income (loss) per share	47,915,030	42,669,333	35,892,786