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WARRANTIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
WARRANTIES [Abstract]    
Beginning balance $ 858 $ 1,223
Warranty provisions 123 47
Warranty claims (74) (126)
Adjustments to preexisting warranties (251) (286)
Ending balance $ 656 $ 858