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PRODUCT WARRANTIES | 12 Months Ended
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Dec. 31, 2023
PRODUCT WARRANTIES |
PRODUCT WARRANTIES | 11.PRODUCT WARRANTIES The warranty reserve activity consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended
​ | ​ | ​ | December 31,
​ |  | ​ | 2023 |  | 2022 | ​ | 2021
Balance at the beginning of the fiscal year | ​ | ​ | $ | 3,990 | ​ | $ | 4,909 | ​ | $ | 2,882
Adjustments to reserve | ​ | ​ |  | 5,319 | ​ |  | 4,567 | ​ |  | 8,824
Warranty liabilities assumed in Radiant Acquisition | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 50
Less: Settlements made (in cash or in kind) | ​ | ​ |  | (6,148) | ​ |  | (5,486) | ​ |  | (6,847)
Balance at the end of the fiscal year | ​ | ​ | $ | 3,161 | ​ | $ | 3,990 | ​ | $ | 4,909
​

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