Segment Information - Schedule of Long-Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	$ 404	$ 522
Taiwan
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	280	308
China
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	100	176
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	13	29
South Korea
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	8	6
Japan
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	$ 3	$ 3