Net Income (Loss) per Share - Computation of Denominators Used in Net Loss per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic:
Weighted average common shares outstanding - Basic	50,059,984	46,799,703	49,989,379	46,762,327
Diluted:
Weighted average common shares outstanding - Basic	50,059,984	46,799,703	49,989,379	46,762,327
Common stock equivalents	0	0	0	0
Denominator for diluted net loss per share	50,059,984	46,799,703	49,989,379	46,762,327