EARNINGS PER SHARE - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Numerator:
Net income (loss)	$ 14,840	$ (2,009)	$ 13,311	$ (8,133)
Denominator:
Basic (in shares)	104,630	101,218	104,312	100,539
Diluted (in shares)	108,984	101,218	109,774	100,539
Net income (loss) per share:
Basic (in dollars per share)	$ 0.14	$ (0.02)	$ 0.13	$ (0.08)
Diluted (in dollars per share)	$ 0.14	$ (0.02)	$ 0.12	$ (0.08)
Stock options
Denominator:
Weighted average number diluted shares outstanding adjustment (in shares)	234	0	249	0
Restricted stock units
Denominator:
Weighted average number diluted shares outstanding adjustment (in shares)	1,193	0	1,627	0
Stock purchase rights under the ESPP
Denominator:
Weighted average number diluted shares outstanding adjustment (in shares)	71	0	35	0
2022 Notes
Denominator:
Weighted average number diluted shares outstanding adjustment (in shares)	2,365	0	2,537	0
2024 Notes
Denominator:
Weighted average number diluted shares outstanding adjustment (in shares)	491	0	1,014	0