Net (Loss) Income Per Share - Computation of Numerators and Denominators Used in Basic and Diluted Net Loss Per Share Amounts (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net (loss) income	$ (13,648)	$ 14,360	$ (10,223)	$ 6,030	$ 712	$ (4,193)
Denominator:
Denominator for basic (loss) income per share— weighted average shares	75,263		72,999		74,959	72,811
Effect of dilutive securities, stock options and RSUs					4,892
Denominator for dilutive (loss) income per share	75,263		72,999		79,851	72,811
Net (loss) income per share attributable to common stockholders, basic	$ (0.18)		$ (0.14)		$ 0.01	$ (0.06)
Net (loss) imcome per share attributable to common stockholders, diluted	$ (0.18)		$ (0.14)		$ 0.01	$ (0.06)