Net Income (Loss) Per Share - Computations of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic net income (loss) per share:
Net income (loss)	$ 127,840	$ (111,250)	$ (94,733)
Shares used in computation:
Weighted-average common shares outstanding	42,438	37,281	36,690
Basic net income (loss) per share	$ 3.01	$ (2.98)	$ (2.58)
Diluted net income (loss) per share:
Net income (loss)	$ 127,840	$ (111,250)	$ (94,733)
Shares used in computation:
Weighted-average common shares outstanding	42,438	37,281	36,690
Weighted-average diluted common shares	43,913	37,281	36,690
Diluted net income (loss) per share	$ 2.91	$ (2.98)	$ (2.58)
Stock Option [Member]
Shares used in computation:
Weighted-average diluted common shares	1,467
Restricted Stock Units (RSUs)
Shares used in computation:
Weighted-average diluted common shares	2
Employee Stock Purchase Plan [Member]
Shares used in computation:
Weighted-average diluted common shares	6