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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets          
Revenue $ 165,285 $ 188,760 $ 345,918 $ 397,236  
Power discrete          
Revenues from External Customers and Long-Lived Assets          
Revenue 108,780 137,582 230,280 282,155  
Power IC          
Revenues from External Customers and Long-Lived Assets          
Revenue 50,295 49,972 103,042 112,292  
Packaging and testing services          
Revenues from External Customers and Long-Lived Assets          
Revenue 744 1,206 1,489 2,789  
License and development services          
Revenues from External Customers and Long-Lived Assets          
Revenue 5,466 0 11,107 0 $ 21,100
Hong Kong          
Revenues from External Customers and Long-Lived Assets          
Revenue 124,081 159,301 265,287 331,597  
China          
Revenues from External Customers and Long-Lived Assets          
Revenue 30,543 15,730 57,162 43,744  
South Korea          
Revenues from External Customers and Long-Lived Assets          
Revenue 4,033 3,642 9,344 6,539  
United States          
Revenues from External Customers and Long-Lived Assets          
Revenue 1,005 7,972 2,400 12,456  
Other countries          
Revenues from External Customers and Long-Lived Assets          
Revenue $ 5,623 $ 2,115 $ 11,725 $ 2,900