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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Accrual at beginning of the year $ 3,373 $ 3,859
Provision 2,416 2,915
Settlement and Other (2,713) (3,401)
Accrual at end of year $ 3,076 $ 3,373