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EARNINGS PER SHARE - Schedule of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 1,530	$ (5,381)	$ (6,603)	$ (42,736)
Weighted average number of shares outstanding:
Basic (in shares)	102,099	97,563	101,057	96,623
Stock options, restricted stock units and ESPP (in shares)	1,505	0	0	0
Convertible debt (in shares)	2,817	0	0	0
Diluted (in shares)	106,421	97,563	101,057	96,623
Net income (loss) per share:
Basic (in dollars per share)	$ 0.01	$ (0.06)	$ (0.07)	$ (0.44)
Diluted (in dollars per share)	$ 0.01	$ (0.06)	$ (0.07)	$ (0.44)

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