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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Accrued wages, commissions, bonuses and benefits $ 10,510 $ 12,382
Accrued products warranty 3,373 3,859
Accrued taxes 2,164 2,079
Other 8,726 9,493
Accrued liabilities $ 24,773 $ 27,813