Net Loss per Share - Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss attributable to common stockholders	$ (65,578)	$ (89,127)	$ (70,279)
Denominator:
Weighted average common shares outstanding, basic and diluted	91,702,866	79,789,220	56,649,220
Net loss per share attributable to common stockholders, basic and diluted	$ (0.72)	$ (1.12)	$ (1.24)