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Geographic and Other Information - Schedule of Product Categories (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues	$ 45,946	$ 55,434	$ 138,290	$ 145,272
Power Solution Business [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		64,020		160,396
Power Solution Business [Member] | Mixed Signal Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		16,446		37,047
Power Solution Business [Member] | Power Analog Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		47,574		123,349
Power Solution Business [Member] | Other Solutions Business [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		64,020		160,396
Power Solution Business [Member] | Other Solutions Business [Member] | Mixed Signal Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		16,446		37,047
Power Solution Business [Member] | Other Solutions Business [Member] | Power Analog Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		47,574		123,349
Power Solution Business [Member] | Power Analog Solutions Business [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		47,574		123,349
Power Solution Business [Member] | Power Analog Solutions Business [Member] | Mixed Signal Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		0		0
Power Solution Business [Member] | Power Analog Solutions Business [Member] | Power Analog Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		47,574		123,349
Power Solution Business [Member] | Power Ic [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		5,420		13,621
Power Solution Business [Member] | Power Ic [Member] | Mixed Signal Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		5,420		13,621
Power Solution Business [Member] | Power Ic [Member] | Power Analog Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		0		0
Power Solution Business [Member] | Discontinued Operation [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		11,026		23,426
Power Solution Business [Member] | Discontinued Operation [Member] | Mixed Signal Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		11,026		23,426
Power Solution Business [Member] | Discontinued Operation [Member] | Power Analog Solutions [Member]
Segment Reporting Information by Segment for Current Period Presentation [Line Items]
Total revenues		$ 0		$ 0

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