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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Term of product warranty 1 year  
Warranty liability, beginning of period $ 3,027 $ 2,602
Product warranty accrued 3,593 2,957
Warranty costs incurred (3,542) (2,532)
Warranty liability, end of period 3,078 3,027
Advertising Costs $ 1,139 $ 762