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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Significant segment financial data          
Net revenues $ 55,467 $ 65,402 $ 115,135 $ 135,857  
Income (loss) from operations 709 4,384 1,173 10,804  
Total assets 208,842 215,100 208,842 215,100 208,141
Depreciation and amortization 2,612 2,773 5,244 5,401  
BBU [Member]
          
Significant segment financial data          
Net revenues 45,822 49,066 90,757 104,657  
Income (loss) from operations 8,495 8,433 14,458 19,326  
Total assets 86,131 80,490 86,131 80,490  
Depreciation and amortization 1,243 1,403 2,504 2,691  
VI Chip [Member]
          
Significant segment financial data          
Net revenues 9,520 15,048 23,938 29,355  
Income (loss) from operations (7,012) (3,706) (11,804) (8,019)  
Total assets 21,234 30,866 21,234 30,866  
Depreciation and amortization 898 901 1,792 1,774  
Picor [Member]
          
Significant segment financial data          
Net revenues 2,401 3,638 5,114 6,940  
Income (loss) from operations (597) (103) (1,113) (42)  
Total assets 6,030 7,861 6,030 7,861  
Depreciation and amortization 102 112 206 225  
Corporate [Member]
          
Significant segment financial data          
Income (loss) from operations (177) (240) (368) (461)  
Total assets 129,744 115,115 129,744 115,115  
Depreciation and amortization 369 357 742 711  
Eliminations [Member]
          
Significant segment financial data          
Net revenues (2,276) (2,350) (4,674) (5,095)  
Total assets $ (34,297) $ (19,232) $ (34,297) $ (19,232)