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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Significant segment financial data          
Net revenues $ 52,948 $ 58,560 $ 168,083 $ 194,417  
Income (loss) from operations 296 1,674 1,469 12,478  
Total assets 209,799 207,984 209,799 207,984 208,141
Depreciation and amortization 2,626 2,812 7,870 8,214  
BBU [Member]
          
Significant segment financial data          
Net revenues 45,753 43,968 136,510 148,625  
Income (loss) from operations 7,903 5,941 22,361 25,267  
Total assets 94,532 80,801 94,532 80,801  
Depreciation and amortization 1,267 1,410 3,771 4,100  
VI Chip [Member]
          
Significant segment financial data          
Net revenues 7,487 13,609 31,425 42,964  
Income (loss) from operations (6,620) (3,646) (18,424) (11,665)  
Total assets 22,085 30,611 22,085 30,611  
Depreciation and amortization 885 899 2,677 2,674  
Picor [Member]
          
Significant segment financial data          
Net revenues 2,206 3,421 7,320 10,361  
Income (loss) from operations (813) (508) (1,926) (550)  
Total assets 5,245 7,885 5,245 7,885  
Depreciation and amortization 103 117 309 342  
Corporate [Member]
          
Significant segment financial data          
Net revenues 0 0 0 0  
Income (loss) from operations (174) (113) (542) (574)  
Total assets 129,444 112,465 129,444 112,465  
Depreciation and amortization 371 386 1,113 1,098  
Eliminations [Member]
          
Significant segment financial data          
Net revenues (2,498) (2,438) (7,172) (7,533)  
Income (loss) from operations 0 0 0 0  
Total assets (41,507) (23,778) (41,507) (23,778)  
Depreciation and amortization $ 0 $ 0 $ 0 $ 0