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ACCRUED WARRANTY COSTS | 12 Months Ended
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Dec. 31, 2020
ACCRUED WARRANTY COSTS |
ACCRUED WARRANTY COSTS | 15. ACCRUED WARRANTY COSTS The Company’s warranty activity is summarized below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | $ | ​ | $ | ​ | $
Beginning balance |  | 55,659 |  | 50,605 |  | 55,878
Warranty provision |  | 13,188 |  | 28,044 |  | 26,931
Warranty costs incurred |  | (16,732) |  | (23,282) |  | (46,067)
Foreign exchange effect | ​ | (1,510) | ​ | 511 | ​ | 990
Ending balance |  | 50,605 |  | 55,878 |  | 37,732
​

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- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details
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