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 |