Segment Information - Schedule of Long-lived Assets Per Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	$ 522	$ 634
Taiwan
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	308	389
China
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	176	179
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	29	52
South Korea
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	6	6
Japan
Revenues From External Customers And Long Lived Assets [Line Items]
Total property and equipment - net	$ 3	$ 8