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INCOME TAXES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes (Textual)      
Domestic $ (12,992) $ (15,599) $ (21,784)
Foreign 67 55 104
Income loss before taxes $ (12,925) $ (15,544) $ (21,680)