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ACCRUED LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2022
ACCRUED LIABILITIES |
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Compensation and fringe benefits | ​ | $ | 11,317 | ​ | $ | 14,666
Accrued business acquisition consideration | ​ |  | 12,559 | ​ |  | 12,388
Warranty reserve | ​ |  | 2,038 | ​ |  | 1,869
Operating lease liabilities - current | ​ | ​ | 5,035 | ​ | ​ | 4,532
Finance lease obligations - current | ​ | ​ | 338 | ​ | ​ | —
Deferred revenue | ​ | ​ | 6,977 | ​ | ​ | 2,425
Other accrued expenses | ​ |  | 8,031 | ​ |  | 5,776
​ | ​ | $ | 46,295 | ​ | $ | 41,656

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