OTHER FINANCIAL STATEMENT INFORMATION - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 9,900	$ 11,453
Contract assets	11,688	9,800
Other	13,855	16,879
Total	$ 35,443	$ 38,132