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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Term of product warranty 1 year 1 year
Warranty liability, beginning of period $ 3,078 $ 3,027
Product warranty accrued 1,834 3,593
Warranty costs incurred (2,318) (3,542)
Warranty liability, end of period 2,594 3,078
Advertising Costs $ 1,193 $ 1,139