Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Information and Foreign Operations
Number of operating segments | segment	1
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	$ 19,405	$ 39,653
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	164,183		$ 162,778
China
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	163,910		162,432
North America (primarily the United States)
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	273		$ 346
Reportable Geographical Components
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	19,405	39,653
Reportable Geographical Components | China
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	8,102	17,480
Reportable Geographical Components | Taiwan
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	2,471	6,859
Reportable Geographical Components | Japan
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	1,535	2,807
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan and Japan)
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	1,091	1,756
Reportable Geographical Components | Europe (primarily Germany)
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	3,570	6,394
Reportable Geographical Components | North America (primarily the United States)
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	$ 2,636	$ 4,357