Segment Information and Foreign Operations (Tables)

12 Months Ended

Dec. 31, 2023

Segment Information and Foreign Operations

Revenues reported by product type

The following table represents revenue amounts (in thousands) by product type:

	Year Ended
	December 31,
	2023		2022		2021
Product Type:
Substrates	$	47,466	$	111,094	$	103,026
Raw materials and others		28,329		30,024		34,367
Total	$	75,795	$	141,118	$	137,393

Revenue reported for products shipped to customers in the corresponding geographic region

The following table represents revenue amounts (in thousands) reported for products shipped to customers in the corresponding geographic region:

	Year Ended
	December 31,
	2023		2022		2021
Geographical region:
China	$	39,778	$	55,414	$	67,394
Taiwan		8,651		28,780		16,841
Japan		4,641		11,724		10,112
Asia Pacific (excluding China, Taiwan and Japan)		3,814		4,188		7,540
Europe (primarily Germany)		12,315		20,592		23,069
North America (primarily the United States)		6,596		20,420		12,437
Total	$	75,795	$	141,118	$	137,393

Long-lived assets by geographic region

Long-lived assets consist primarily of property, plant and equipment, and operating lease right-of-use assets are attributed to the geographic location in which they are located. Long-lived assets, net of depreciation, by geographic region were as follows (in thousands):

	As of December 31,
	2023		2022
Long-lived assets by geographic region, net of depreciation:
North America	$	1,631	$	346
China		167,516		162,432
	$	169,147	$	162,778