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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
ACCRUED LIABILITIES.    
Warranty liability $ 2,594 $ 3,078
Litigation reserve 899 325
Federal and state taxes payable 5,603 1,761
Accrued expenses & other accrued liabilities 5,764 3,644
Total $ 14,860 $ 8,808