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STOCK-BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2022
Jan. 03, 2021
Dec. 29, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 7,231 $ 7,250 $ 7,135
Cost of revenue      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense 1,250 2,080 1,642
Research and development      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense 352 1,217 1,880
Sales, general and administrative      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 5,629 $ 3,953 $ 3,613