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v3.21.1

VALUATION ACCOUNTS | 12 Months Ended
--- | ---
Dec. 31, 2020
VALUATION ACCOUNTS |
VALUATION ACCOUNTS | 30— VALUATION ACCOUNTS ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Allowance |  | Allowance |  | ​ |  | ​
​ | ​ | for deferred | ​ | for doubtful | ​ | Slow-moving | ​ | Warranty
​ | ​ | tax assets | ​ | accounts | ​ | inventory | ​ | reserve
Balance as of December 31, 2017 |  | 14,266 |  | 1,029 |  | 723 |  | 449
Charges to costs and expenses |  | 515 |  | 365 |  | 355 |  | 433
Deductions: write-off and others |  | (228) |  | 10 |  | (104) |  | (334)
Balance as of December 31, 2018 |  | 14,553 |  | 1,404 |  | 974 |  | 548
Charges to costs and expenses |  | 859 |  | 94 |  | 333 |  | 131
Deductions: write-off and others |  | (435) |  | (9) |  | (223) |  | (308)
Balance as of December 31, 2019 |  | 14,977 |  | 1,490 |  | 1,085 |  | 370
Charges to costs and expenses |  | 596 |  | 90 |  | 651 |  | 266
Deductions: write-off and others |  | (65) |  | (858) |  | (172) |  | (268)
Balance as of December 31, 2020 |  | 15,508 |  | 722 |  | 1,563 |  | 368
​

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