EARNINGS PER SHARE - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential weighted common shares outstanding excluded from diluted net loss per share (in shares)	69	5,419	6,471	5,609
Convertible debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential weighted common shares outstanding excluded from diluted net loss per share (in shares)	0	0	2,085	390
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential weighted common shares outstanding excluded from diluted net loss per share (in shares)	0	1,558	926	1,637
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential weighted common shares outstanding excluded from diluted net loss per share (in shares)	69	3,336	3,079	3,066
Stock purchase rights under the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential weighted common shares outstanding excluded from diluted net loss per share (in shares)	0	525	381	516