Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic loss per share:
Net loss attributable to common stockholders (numerator)	$ (75,461)	$ (33,427)
Shares used in computation (denominator)
Weighted-average common shares outstanding	93,215	91,793
Basic loss per share	$ (0.81)	$ (0.36)
Diluted loss per share:
Net loss attributable to common stockholders (numerator)	$ (75,461)	$ (33,427)
Shares used in computation (denominator)
Weighted-average common shares outstanding	93,215	91,793
Effect of dilutive securities:
Weighted-average diluted shares	93,215	91,793
Diluted loss per share	$ (0.81)	$ (0.36)