Net Loss per Share - Schedule Of Earnings Per Share Basic And Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net loss attributable to stockholders	$ (25,256)	$ 3,397	$ 628	$ (10,386)	$ (24,947)	$ (15,900)	$ (21,231)	$ (51,233)
Less: Undistributed amounts allocated to participating securities
Undistributed losses allocated to stockholders	$ (25,256)			$ (10,386)			$ (21,231)	$ (51,233)
Denominator:
Weighted average number of shares outstanding, Basic	89,431,022			88,332,134			88,956,388	88,325,838
Weighted average additional shares assuming conversion of potential common shares
Weighted average common shares outstanding - diluted	89,431,022			88,332,134			88,956,388	88,325,838
Net loss per share attributable to stockholders, basic	$ (0.28)			$ (0.12)			$ (0.24)	$ (0.58)
Net loss per share attributable to stockholders, diluted	$ (0.28)			$ (0.12)			$ (0.24)	$ (0.58)