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Segment Information - Segment Financial Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Net revenues $ 56,888 $ 53,227 $ 169,059 $ 152,195  
Income (loss) from operations 100 2,273 (1,816) (3,757)  
Total assets 166,076 155,038 166,076 155,038 $ 154,067
Depreciation and amortization 2,244 2,073 6,590 6,384  
Operating Segments [Member] | BBU [Member]          
Segment Reporting Information [Line Items]          
Net revenues 38,529 38,518 115,141 115,963  
Income (loss) from operations 2,007 3,734 5,962 9,475  
Total assets 227,408 193,115 227,408 193,115  
Depreciation and amortization 971 1,025 2,944 3,293  
Operating Segments [Member] | VI Chip [Member]          
Segment Reporting Information [Line Items]          
Net revenues 14,745 11,961 42,835 30,126  
Income (loss) from operations (2,952) (1,915) (10,761) (12,131)  
Total assets 33,021 21,453 33,021 21,453  
Depreciation and amortization 712 531 2,000 1,660  
Operating Segments [Member] | Picor [Member]          
Segment Reporting Information [Line Items]          
Net revenues 6,360 5,320 19,553 12,596  
Income (loss) from operations 1,359 627 3,825 (510)  
Total assets 11,934 6,928 11,934 6,928  
Depreciation and amortization 188 142 558 404  
Operating Segments [Member] | Corporate [Member]          
Segment Reporting Information [Line Items]          
Income (loss) from operations (314) (173) (842) (591)  
Total assets 64,864 72,521 64,864 72,521  
Depreciation and amortization 373 375 1,088 1,027  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Net revenues (2,746) (2,572) (8,470) (6,490)  
Total assets $ (171,151) $ (138,979) $ (171,151) $ (138,979)