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INVENTORY - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 62,011 $ 46,843
Work-in-process 8,052 9,904
Finished goods 34,590 34,844
Inventory $ 104,653 $ 91,591