Net Loss per Share - Schedule of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Numerator:
Net loss	$ (80,877)	$ (60,079)
Denominator:
Weighted-average shares of common stock—basic (in shares)	239,431	226,511
Effect of dilutive securities (in shares)	0	0
Weighted-average shares of common stock—diluted (in shares)	239,431	226,511
Net loss per share:
Basic (in dollars per share)	$ (0.34)	$ (0.27)
Diluted (in dollars per share)	$ (0.34)	$ (0.27)