Net Income (Loss) per Share - Computation of Denominators Used in Net Loss per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic:
Weighted average common shares outstanding - Basic	49,917,990	46,724,951
Diluted:
Weighted average common shares outstanding - Basic	49,917,990	46,724,951
Common stock equivalents	0	0
Denominator for diluted net loss per share	49,917,990	46,724,951