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Details of Significant Accounts - Revenue, schedule of disaggregation of revenue from contracts with customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue      
Revenue from external customer contracts $ 53,505 $ 47,300 $ 40,760
At a point in time      
Revenue      
Revenue from external customer contracts 7,588 8,566 8,892
Over time      
Revenue      
Revenue from external customer contracts 45,917 38,734 31,868
United States      
Revenue      
Revenue from external customer contracts 24,992 24,291 20,173
United States | At a point in time      
Revenue      
Revenue from external customer contracts 4,380 5,126 5,114
United States | Over time      
Revenue      
Revenue from external customer contracts 20,612 19,165 15,059
Japan      
Revenue      
Revenue from external customer contracts 4,301 4,717 4,520
Japan | At a point in time      
Revenue      
Revenue from external customer contracts 523 871 676
Japan | Over time      
Revenue      
Revenue from external customer contracts 3,778 3,846 3,844
France      
Revenue      
Revenue from external customer contracts 4,170 3,431 3,206
France | At a point in time      
Revenue      
Revenue from external customer contracts 471 590 771
France | Over time      
Revenue      
Revenue from external customer contracts 3,699 2,841 2,435
Others      
Revenue      
Revenue from external customer contracts 20,042 14,861 12,861
Others | At a point in time      
Revenue      
Revenue from external customer contracts 2,214 1,979 2,331
Others | Over time      
Revenue      
Revenue from external customer contracts $ 17,828 $ 12,882 $ 10,530