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Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Information and Foreign Operations
Number of operating segments | segment	1
Single reportable segment
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	$ 99,361	$ 75,795	$ 141,118
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	162,200	169,147
Single reportable segment | CHINA
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	160,847	167,516
Single reportable segment | North America (primarily the United States)
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	1,353	1,631
Single reportable segment | Reportable Geographical Components [Member]
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	99,361	75,795	141,118
Single reportable segment | Reportable Geographical Components [Member] | CHINA
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	56,119	39,778	55,414
Single reportable segment | Reportable Geographical Components [Member] | TAIWAN
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	14,098	8,651	28,780
Single reportable segment | Reportable Geographical Components [Member] | JAPAN
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	4,979	4,641	11,724
Single reportable segment | Reportable Geographical Components [Member] | Asia Pacific (excluding China, Taiwan and Japan)
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	2,818	3,814	4,188
Single reportable segment | Reportable Geographical Components [Member] | Europe (primarily Germany)
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	13,766	12,315	20,592
Single reportable segment | Reportable Geographical Components [Member] | North America (primarily the United States)
Geographic Areas, Revenues from External Customers [Abstract]
Revenue	$ 7,581	$ 6,596	$ 20,420

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