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Product Warranty (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Product Warranties Disclosures [Abstract] |  |  |  |
Warranty costs |  | $ 3,477 | $ 3,501 | $ 8,342
Estimate additional accrual amount | $ 34,100 |  |  |

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- Definition Warranty expense is the cost associated with a vendor or manufacturer's commitment to repair or replace a product, should it not perform as intended during a specified period of time. In other words, it's the cost of repairing or replacing defective products after they have been sold to customers. + References No definition available. + Details
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- References No definition available. + Details
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