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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Accrued wages, commissions, bonuses and benefits $ 12,382 $ 9,152
Accrued products warranty 3,859 3,752
Accrued taxes 2,079 1,039
Other 9,493 10,920
Accrued liabilities $ 27,813 $ 24,863