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Segment Information - Significant Segment Financial Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net revenues $ 65,725 $ 65,269  
Income (loss) from operations 4,493 3,686  
Total assets 225,004 173,630 $ 221,068
Depreciation and amortization 2,445 2,269  
Capital expenditures 3,322 1,858  
BBU [Member]      
Segment Reporting Information [Line Items]      
Net revenues 46,625 40,637  
VI Chip [Member]      
Segment Reporting Information [Line Items]      
Net revenues 16,566 20,139  
Picor [Member]      
Segment Reporting Information [Line Items]      
Net revenues 2,534 4,493  
Operating Segments [Member] | BBU [Member]      
Segment Reporting Information [Line Items]      
Net revenues 47,673 40,637  
Income (loss) from operations 6,055 1,039  
Total assets 287,891 239,619  
Depreciation and amortization 885 912  
Capital expenditures 1,175 399  
Operating Segments [Member] | VI Chip [Member]      
Segment Reporting Information [Line Items]      
Net revenues 18,429 20,881  
Income (loss) from operations 100 1,081  
Total assets 50,975 40,206  
Depreciation and amortization 1,011 811  
Capital expenditures 1,809 1,290  
Operating Segments [Member] | Picor [Member]      
Segment Reporting Information [Line Items]      
Net revenues 3,272 8,221  
Income (loss) from operations (1,310) 2,022  
Total assets 15,614 12,662  
Depreciation and amortization 193 191  
Capital expenditures 338 169  
Operating Segments [Member] | Corporate [Member]      
Segment Reporting Information [Line Items]      
Income (loss) from operations (352) (456)  
Total assets 84,259 58,095  
Depreciation and amortization 356 355  
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net revenues [1] (3,649) (4,470)  
Total assets [1] $ (213,735) $ (176,952)  
[1] The elimination for net revenues is principally related to inter-segment sales by Picor to BBU and VI Chip and for inter-segment sales by VI Chip to BBU. The elimination for total assets is principally related to inter-segment accounts receivable due to BBU for the funding of VI Chip and Picor operations.