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PRODUCT WARRANTIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 452 $ 348
Provision for product warranties 215 321
Product warranty expenses incurred (169) (217)
Accrued product warranties $ 498 $ 452