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ACCRUED EXPENSES AND OTHER LIABILITIES | 3 Months Ended
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Mar. 31, 2023
ACCRUED EXPENSES AND OTHER LIABILITIES |
ACCRUED EXPENSES AND OTHER LIABILITIES | 13. ACCRUED EXPENSES AND OTHER LIABILITIES ​ Accrued expenses and other liabilities consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ | ​ | March 31, |  | December 31,
December 31, | ​ | ​ | ​ | ​ | 2023 |  | 2022
(in thousands) |  | ​ | ​ | ​ | ​ |  |  | ​ |
Accrued payroll and related expenses | ​ | ​ | ​ | ​ | $ | 4,432 | ​ | $ | 3,753
Accrued sales incentives and discounts | ​ | ​ | ​ | ​ |  | 3,508 | ​ |  | 2,485
Accrued warranty costs | ​ | ​ | ​ | ​ |  | 6,487 | ​ |  | 5,699
Deferred revenue | ​ | ​ | ​ | ​ |  | 1,658 | ​ |  | 1,989
Income taxes payable | ​ | ​ | ​ | ​ | ​ | 4,739 | ​ | ​ | 342
Other | ​ | ​ | ​ | ​ |  | 873 | ​ |  | 1,072
Total accrued expenses and other liabilities | ​ | ​ | ​ | ​ | $ | 21,697 | ​ | $ | 15,340
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