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BASIS OF PRESENTATION - Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Components of inventory      
Raw Materials $ 1,381   $ 953
Work-in-process 256   200
Finished Goods 1,944   1,640
Total 3,581   2,793
Less: reserve (152)   (415)
Inventory, net $ 3,429 $ 2,378 $ 2,378