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Geographic Information and Concentrations - Revenue by Geographical Area (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 10,097 $ 7,571 $ 5,281
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 0 0 0
North America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 13 806 0
Asia Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 10,084 $ 6,765 5,281
Japan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues     800
Hong Kong      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues     1,500
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues     $ 3,000