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ACCRUED LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2020
ACCRUED LIABILITIES |
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2020 |  | 2019
Compensation and fringe benefits | ​ | $ | 9,588 | ​ | $ | 12,967
Warranty reserve | ​ |  | 1,508 | ​ |  | 1,075
Income taxes payable | ​ | ​ | 2,852 | ​ | ​ | 2,231
Right of use liabilities | ​ | ​ | 4,016 | ​ | ​ | 3,203
Other accrued expenses | ​ |  | 4,246 | ​ |  | 3,525
​ | ​ | $ | 22,210 | ​ | $ | 23,001

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