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INVENTORIES (Tables) | 9 Months Ended
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Sep. 30, 2021
INVENTORIES |
Schedule of inventories include costs of materials, direct labor and manufacturing overhead, and are stated at the lower of cost (first-in, first-out basis) or net realizable value | Inventories include costs of materials, direct labor and manufacturing overhead, and are stated at the lower of cost (first-in, first-out basis) or net realizable value, as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Parts and raw materials | ​ | $ | 54,077 | ​ | $ | 44,750
Work-in-process | ​ |  | 7,785 | ​ |  | 6,186
Finished goods | ​ |  | 10,377 | ​ |  | 12,042
​ | ​ | $ | 72,239 | ​ | $ | 62,978

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