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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 |

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