Net Income (Loss) per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net income	$ (71,133)	$ 14,716	$ (112,766)	$ 45,104
Preferred distribution to redeemable convertible preferred units	0	(3,252)	(40,689)	(7,435)
Non-cash adjustment to redemption amount of the redeemable convertible preferred units	0	(58,601)	47,537	(104,825)
Net loss attributable to common unitholders	$ (71,133)	$ (47,137)	$ (105,918)	$ (67,156)
Denominator
Basic weighted-average common shares (in shares)	115,189,532,000	37,631,052,000	67,828,046,000	37,631,052,000
Basic net income (loss) per share attributable to common stockholders (in dollars per share)	$ (0.62)	$ (1.25)	$ (1.56)	$ (1.78)