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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Term of product warranty 1 year  
Warranty liability, beginning of period $ 2,594 $ 3,078
Product warranty accrued 2,152 1,834
Warranty costs incurred (1,870) (2,318)
Warranty liability, end of period 2,876 2,594
Advertising Costs $ 367 $ 1,193