Geographic and Other Information - Schedule of Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total revenues	$ 44,722	$ 43,438
Total cost of sales	35,360	37,079
Total gross profit	9,362	6,359
Power solutions business
Segment Reporting Information [Line Items]
Total revenues	44,722	39,912	$ 39,912
Total gross profit	9,362	7,044
Power solutions business | Power Analog Solutions [Member]
Segment Reporting Information [Line Items]
Total gross profit	7,100	5,634
Power solutions business | Power Ic [Member]
Segment Reporting Information [Line Items]
Total gross profit	2,262	1,410
Fab 3 Foundry Services [Member]
Segment Reporting Information [Line Items]
Total revenues	0	3,526
Total cost of sales	0	4,211
Total gross profit	0	(685)
Operating Segments [Member] | Power solutions business
Segment Reporting Information [Line Items]
Total revenues	44,722	39,912
Total cost of sales	35,360	32,868
Operating Segments [Member] | Power solutions business | Power Analog Solutions [Member]
Segment Reporting Information [Line Items]
Total revenues	39,857	36,535
Total cost of sales	32,757	30,901
Operating Segments [Member] | Power solutions business | Power Ic [Member]
Segment Reporting Information [Line Items]
Total revenues	4,865	3,377
Total cost of sales	$ 2,603	$ 1,967