Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION (Details 3)

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REVENUE RECOGNITION (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue Recognition        
Product warranty liabilities $ 1,099 $ 967 $ 1,019 $ 981
Product warrant liabilities Accruals 236 16 496 197
Product warrant liabilities settlements (139) (51) (319) (246)
Balance, end of period $ 1,196 $ 932 $ 1,196 $ 932