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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
ACCRUED LIABILITIES.    
Warranty liability $ 2,640 $ 3,078
Litigation reserve 388 325
Federal and state taxes payable 2,150 1,761
Accrued expenses & other accrued liabilities 7,425 3,644
Total $ 12,603 $ 8,808