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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		26 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025
Revenues from External Customers and Long-Lived Assets
Revenue	$ 164,635	$ 150,060	$ 519,678	$ 495,978
Power discrete
Revenues from External Customers and Long-Lived Assets
Revenue	106,822	93,815	342,232	324,093
Power IC
Revenues from External Customers and Long-Lived Assets
Revenue	54,576	49,990	161,251	153,032
Packaging and testing services and other
Revenues from External Customers and Long-Lived Assets
Revenue	438	1,204	2,354	2,694
License and development services
Revenues from External Customers and Long-Lived Assets
Revenue	2,799	5,051	13,841	16,159	$ 45,000
Hong Kong
Revenues from External Customers and Long-Lived Assets
Revenue	141,316	123,731	445,451	389,018
China
Revenues from External Customers and Long-Lived Assets
Revenue	18,701	19,108	55,871	76,270
South Korea
Revenues from External Customers and Long-Lived Assets
Revenue	515	326	1,214	9,670
United States
Revenues from External Customers and Long-Lived Assets
Revenue	1,167	1,728	2,939	4,128
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue	$ 2,936	$ 5,167	$ 14,203	$ 16,892

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