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Assets Manufactured for Internal Use, net | 12 Months Ended
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Dec. 31, 2022
Assets Manufactured for Internal Use, net |
Assets Manufactured for Internal Use, net | Note 8. Assets Manufactured for Internal Use, net ​ Assets manufactured for internal use, included in other assets, are depreciated using the straight-line method over their 10 year estimated useful life. Their components are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |
​ | ​ | (in thousands) |
Internal use assets | ​ | $ | 61,603 | ​ | $ | 60,596 | ​
Construction in process | ​ |  | 2,629 | ​ |  | 172 | ​
Total cost | ​ |  | 64,232 | ​ |  | 60,768 | ​
Accumulated depreciation | ​ |  | (33,992) | ​ |  | (28,764) | ​
Assets manufactured for internal use, net | ​ | $ | 30,240 | ​ | $ | 32,004 | ​
​ These products are used for research and development, training, and customer demonstration purposes. ​ Depreciation expense was $5.2 million, $5.3 million and $5.2 million for the years ended December 31, 2022, 2021 and 2020, respectively.

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