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
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Numerator:
Net loss	$ (54,452)	$ (51,893)	$ (138,255)	$ (199,876)
Denominator:
Weighted-average shares of common stock— basic for Class A and Class B (in shares)	270,443	258,753	267,958	256,046
Effect of dilutive securities (in shares)	0	0	0	0
Weighted-average shares of common stock— diluted for Class A and Class B (in shares)	270,443	258,753	267,958	256,046
Net loss per share:
Basic (in dollars per share)	$ (0.20)	$ (0.20)	$ (0.52)	$ (0.78)
Diluted (in dollars per share)	$ (0.20)	$ (0.20)	$ (0.52)	$ (0.78)