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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty Reserve Rollforward (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Balance, December 31, 2020 $ 0
Provision for warranties 7,063
Settlements (834)
Balance, September 30, 2021 $ 6,229