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Product Warranty (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Product Warranties Disclosures [Abstract] |  |
Schedule of movement of product warranty |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2021 |  | 2020 |  | 2021
Balance at beginning of the period |  | $ | 17,358 |  |  | $ | 25,543 |  |  | $ | 18,416 |  |  | $ | 19,356 |
Provided for new sales during the period |  |  | 1,517 |  |  |  | 1,498 |  |  |  | 2,468 |  |  |  | 3,761 |
Provided for pre-existing legacy product |  |  | — |  |  |  | 34,055 |  |  |  | — |  |  |  | 40,849 |
Utilized during the period |  |  | (313 | ) |  |  | (9,229 | ) |  |  | (2,322 | ) |  |  | (12,099 | )
Balance at end of the period |  | $ | 18,562 |  |  | $ | 51,867 |  |  | $ | 18,562 |  |  | $ | 51,867 |
|  | December 31, 2019 |  | December 31, 2020
Balance at beginning of the year |  | $ | 16,565 |  |  | $ | 18,416 |
Provided during the year |  |  | 3,501 |  |  |  | 3,477 |
Utilized during the year |  |  | (1,650 | ) |  |  | (2,537 | )
Balance at end of the year |  | $ | 18,416 |  |  | $ | 19,356 |
Product warranty – current |  | $ | 3,723 |  |  | $ | 4,296 |
Product warranty – non-current |  |  | 14,693 |  |  |  | 15,060 |
Schedule of warranty cost |
|  | December 31, 2020 |  | September 30, 2021
Product warranty – current |  | $ | 4,296 |  | $ | 18,690
Product warranty – non-current |  |  | 15,060 |  |  | 33,177
Total |  | $ | 19,356 |  | $ | 51,867

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- Definition Tabular disclosure of product information that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249 + Details
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