Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 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	$ 141,118	$ 137,393	$ 95,361
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	162,778	144,739
China
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	162,432	143,129
North America (primarily the United States)
Long-lived assets by geographic region, net of depreciation:
Long-lived assets	346	1,610
Reportable Geographical Components
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	141,118	137,393	95,361
Reportable Geographical Components | China
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	55,414	67,394	35,150
Reportable Geographical Components | Taiwan
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	28,780	16,841	16,485
Reportable Geographical Components | Japan
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	11,724	10,112	7,624
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan)
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	4,188	7,540	5,458
Reportable Geographical Components | Europe (primarily Germany)
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	20,592	23,069	19,673
Reportable Geographical Components | North America (primarily the United States)
Net revenues reported for products shipped to customers in corresponding geographic region
Revenue	$ 20,420	$ 12,437	$ 10,971