Net Loss per Share - Schedule of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Numerator:
Net loss	$ (2,056)	$ (113,403)	$ (201,201)	$ (231,722)
Denominator:
Weighted-average shares of common stock—basic (in shares)	245,838	234,242	242,746	230,918
Effect of dilutive securities (in shares)	0	0	0	0
Weighted-average shares of common stock—diluted (in shares)	245,838	234,242	242,746	230,918
Net loss per share:
Basic (in dollars per share)	$ (0.01)	$ (0.48)	$ (0.83)	$ (1.00)
Diluted (in dollars per share)	$ (0.01)	$ (0.48)	$ (0.83)	$ (1.00)