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Segment Information - Schedule of geographic information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Geographic information      
Revenue $ 53,505 $ 47,300 $ 40,760
United States      
Geographic information      
Revenue 24,992 24,291 20,173
Japan      
Geographic information      
Revenue 4,301 4,717 4,520
France      
Geographic information      
Revenue 4,170 3,431 3,206
Others      
Geographic information      
Revenue $ 20,042 $ 14,861 $ 12,861