Income (Loss) Per Share - Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016
Numerator:
Net loss	$ (24,027)	$ (25,180)
Denominator:
Basic and diluted	79,810	76,996
Net loss per share:
Basic and diluted	$ (0.30)	$ (0.33)