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INVENTORY - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Inventory Disclosure [Abstract]        
Change in inventory reserve $ 3,900,000 $ 183,000 $ 4,155,000 $ 183,000