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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Significant segment financial data      
Net revenues $ 41,946 $ 59,668  
Income (loss) from operations (8,496) 464  
Total assets 187,843 208,424 202,581
Depreciation and amortization 2,494 2,632  
BBU [Member]
      
Significant segment financial data      
Net revenues 38,202 44,935  
Income (loss) from operations 2,149 5,963  
Total assets 102,264 82,311  
Depreciation and amortization 1,194 1,261  
VI Chip [Member]
      
Significant segment financial data      
Net revenues 3,407 14,418  
Income (loss) from operations (9,238) (4,792)  
Total assets 17,843 25,958  
Depreciation and amortization 901 894  
Picor [Member]
      
Significant segment financial data      
Net revenues 1,782 2,713  
Income (loss) from operations (1,204) (516)  
Total assets 5,334 6,542  
Depreciation and amortization 108 104  
Corporate [Member]
      
Significant segment financial data      
Income (loss) from operations (203) (191)  
Total assets 108,551 123,637  
Depreciation and amortization 291 373  
Eliminations [Member]
      
Significant segment financial data      
Net revenues (1,445) (2,398)  
Total assets $ (46,149) $ (30,024)