Assets Manufactured for Internal Use, net

12 Months Ended

Dec. 31, 2023

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,
	2023		2022
	(in thousands)
Internal use assets	$	76,273	$	61,603
Construction in process		236		2,629
Total cost		76,509		64,232
Accumulated depreciation		(39,588)		(33,992)
Assets manufactured for internal use, net	$	36,921	$	30,240

These products are used for research and development, training, and customer demonstration purposes.

Depreciation expense was $5.6 million, $5.2 million and $5.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.