Net Loss Per Share - Computation of Denominators Used in Net Loss per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic:
Weighted average common shares outstanding - Basic	53,614,668	50,059,984	53,561,161	49,989,379
Diluted:
Weighted average common shares outstanding - Basic	53,614,668	50,059,984	53,561,161	49,989,379
Common stock equivalents	0	0	0	0
Denominator for diluted net loss per share	53,614,668	50,059,984	53,561,161	49,989,379