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Segment Information - Significant of Segment Financial Data (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Net revenues $ 46,865 $ 55,467 $ 88,811 $ 115,135  
Income (loss) from operations (6,982) 709 (15,478) 1,173  
Total assets 177,268 208,842 177,268 208,842 202,581
Depreciation and amortization 2,534 2,612 5,028 5,244  
BBU [Member]
          
Segment Reporting Information [Line Items]          
Net revenues 40,211 45,822 78,413 90,757  
Income (loss) from operations 2,441 8,495 4,590 14,458  
Total assets 112,117 86,131 112,117 86,131  
Depreciation and amortization 1,283 1,243 2,477 2,504  
VI Chip [Member]
          
Segment Reporting Information [Line Items]          
Net revenues 6,639 9,520 10,046 23,938  
Income (loss) from operations (8,349) (7,012) (17,587) (11,804)  
Total assets 17,667 21,234 17,667 21,234  
Depreciation and amortization 807 898 1,708 1,792  
Picor [Member]
          
Segment Reporting Information [Line Items]          
Net revenues 2,808 2,401 4,590 5,114  
Income (loss) from operations (811) (597) (2,015) (1,113)  
Total assets 4,790 6,030 4,790 6,030  
Depreciation and amortization 111 102 219 206  
Corporate [Member]
          
Segment Reporting Information [Line Items]          
Net revenues              
Income (loss) from operations (263) (177) (466) (368)  
Total assets 96,795 129,744 96,795 129,744  
Depreciation and amortization 333 369 624 742  
Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Net revenues (2,793) (2,276) (4,238) (4,674)  
Income (loss) from operations              
Total assets (54,101) (34,297) (54,101) (34,297)  
Depreciation and amortization