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Assets Manufactured for Internal Use, net | 12 Months Ended
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Dec. 31, 2019
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, |
|  | 2019 |  | 2018 |
|  | (in thousands) |
Internal use assets |  | $ | 56,775 |  | $ | 47,509 |
Construction in process |  |  | 5,242 |  |  | 1,609 |
Total cost |  |  | 62,017 |  |  | 49,118 |
Accumulated depreciation |  |  | (19,259) |  |  | (19,285) |
Assets manufactured for internal use, net |  | $ | 42,758 |  | $ | 29,833 |
These products are used for research and development, training, and customer demonstration purposes. Depreciation expense was $3.9 million, $2.6 million and $2.8 million for the years ended December 31, 2019, 2018 and 2017, respectively.

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