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Segment Information - Significant Segment Financial Data (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net revenues $ 53,233 $ 41,946  
Income (loss) from operations (5,439) (8,496)  
Total assets 163,088 187,843 165,640
Depreciation and amortization 2,443 2,494  
Operating Segments [Member] | BBU [Member]
      
Segment Reporting Information [Line Items]      
Net revenues 43,689 38,202  
Income (loss) from operations 2,312 2,149  
Total assets 138,770 102,264  
Depreciation and amortization 1,193 1,194  
Operating Segments [Member] | VI Chip [Member]
      
Segment Reporting Information [Line Items]      
Net revenues 9,341 3,407  
Income (loss) from operations (6,847) (9,238)  
Total assets 20,011 17,843  
Depreciation and amortization 791 901  
Operating Segments [Member] | Picor [Member]
      
Segment Reporting Information [Line Items]      
Net revenues 2,950 1,782  
Income (loss) from operations (742) (1,204)  
Total assets 4,514 5,334  
Depreciation and amortization 101 108  
Operating Segments [Member] | Corporate [Member]
      
Segment Reporting Information [Line Items]      
Net revenues        
Income (loss) from operations (162) (203)  
Total assets 75,130 108,551  
Depreciation and amortization 358 291  
Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Net revenues (2,747) (1,445)  
Income (loss) from operations        
Total assets (75,337) (46,149)  
Depreciation and amortization