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ACCRUED EXPENSES AND OTHER LIABILITIES | 9 Months Ended
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Sep. 30, 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ | ​ | September 30, |  | December 31,
(in thousands) | ​ | ​ | ​ | ​ | 2023 |  | 2022
Accrued payroll and related expenses | ​ | ​ | ​ | ​ | $ | 3,657 | ​ | $ | 3,753
Accrued sales incentives and discounts | ​ | ​ | ​ | ​ |  | 1,599 | ​ |  | 2,485
Accrued warranty costs | ​ | ​ | ​ | ​ |  | 7,243 | ​ |  | 5,699
Deferred revenue | ​ | ​ | ​ | ​ |  | 1,212 | ​ |  | 1,989
Income taxes payable | ​ | ​ | ​ | ​ | ​ | 1,097 | ​ | ​ | 342
Other | ​ | ​ | ​ | ​ |  | 1,410 | ​ |  | 1,072
Total accrued expenses and other liabilities | ​ | ​ | ​ | ​ | $ | 16,218 | ​ | $ | 15,340
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