Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 7,408	$ (5,952)
Shares used in basic Net income (loss) per share (in shares)	130,992	124,076
Dilutive effect of stock options, RSUs and ESPP shares (in shares)	3,818	0
Shares used in diluted Net income (loss) per share (in shares)	134,810	124,076
Basic Net income (loss) per share (in usd per share)	$ 0.06	$ (0.05)
Diluted Net income (loss) per share (in usd per share)	$ 0.05	$ (0.05)
Stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition excluded as they are antidilutive	812	9,424