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BASIS OF PRESENTATION AND SUMMARY OF ACCOUNTING POLICIES - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Finished goods $ 245,117 $ 194,209
Work in process 224 45
Raw materials 11,581 8,910
Total $ 256,922 $ 203,164