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INVENTORY - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]        
Change in inventory reserve $ 198,000 $ 0 $ 808,000 $ 4,155,000