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PROPERTY AND EQUIPMENT (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
PROPERTY AND EQUIPMENT, NET |
Schedule of Property, Plant and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Useful Life |  | ​ | ​ |  | ​ | ​
​ | ​ | In Years | ​ | September 30, 2021 | ​ | December 31, 2020
Tooling and equipment |  | 7 - 15 | ​ | $ | 13,400 | ​ | $ | 13,465
Furniture and other equipment |  | 5 | ​ |  | 7,785 | ​ |  | 7,379
Computer software |  | 5 | ​ |  | 1,987 | ​ |  | 2,378
Leasehold improvements |  | 3 - 6 | ​ |  | 3,467 | ​ |  | 3,314
Equipment under capital lease |  | 5 | ​ |  | 192 | ​ |  | 197
​ | ​ | ​ | ​ |  | 26,831 | ​ |  | 26,733
Less accumulated depreciation | ​ | ​ | ​ |  | (19,427) | ​ |  | (18,894)
​ | ​ | ​ | ​ | $ | 7,404 | ​ | $ | 7,839

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