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Geographic and Other Information - Schedule of Operating Segment (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 [Line Items]        
Total revenues $ 45,946 $ 55,434 $ 138,290 $ 145,272
Total cost of sales 37,405 43,928 110,675 117,621
Total gross profit 8,541 11,506 27,615 27,651
Power solutions business        
Segment Reporting Information [Line Items]        
Total revenues 45,946 52,994 138,290 136,970
Total gross profit 8,541 11,665 27,615 28,616
Power solutions business | Power Analog Solutions [Member]        
Segment Reporting Information [Line Items]        
Total gross profit 6,642 9,249 21,451 22,598
Power solutions business | Power Ic [Member]        
Segment Reporting Information [Line Items]        
Total gross profit 1,899 2,416 6,164 6,018
Fab 3 Foundry Services [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 2,440 0 8,302
Total cost of sales 0 2,599 0 9,267
Total gross profit 0 (159) 0 (965)
Operating Segments [Member] | Power solutions business        
Segment Reporting Information [Line Items]        
Total revenues 45,946 52,994 138,290 136,970
Total cost of sales 37,405 41,329 110,675 108,354
Operating Segments [Member] | Power solutions business | Power Analog Solutions [Member]        
Segment Reporting Information [Line Items]        
Total revenues 41,548 47,574 123,666 123,349
Total cost of sales 34,906 38,325 102,215 100,751
Operating Segments [Member] | Power solutions business | Power Ic [Member]        
Segment Reporting Information [Line Items]        
Total revenues 4,398 5,420 14,624 13,621
Total cost of sales $ 2,499 $ 3,004 $ 8,460 $ 7,603