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INVENTORY - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]        
Change in inventory reserve $ 1,000,000.0 $ 198,000 $ 2,058,000 $ 808,000