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Segment and Geographic Area Information - Summary of Company's Revenues and Long-Lived Assets, Net, by Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 36,939 $ 34,437
Long-lived assets, net 476 630
Country US [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 35,988 22,624
Long-lived assets, net 476 630
China [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 851 11,713
UNITED KINGDOM [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 100 $ 100