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Segment Information - Significant Segment Financial Data (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Net revenues $ 55,258 $ 55,091 $ 46,865 $ 41,946 $ 50,424 $ 52,948 $ 55,467 $ 59,668 $ 199,160 $ 218,507 $ 252,968
Income (loss) from operations                 (20,467) (2,785) 13,686
Total assets 165,640       202,581       165,640 202,581 208,141
Depreciation and amortization                 10,008 10,423 11,005
Operating Segments [Member] | BBU [Member]
                      
Segment Reporting Information [Line Items]                      
Net revenues                 163,013 179,919 194,830
Income (loss) from operations                 12,062 28,114 31,938
Total assets 126,585       97,507       126,585 97,507 82,096
Depreciation and amortization                 6,185 4,958 5,503
Operating Segments [Member] | VI Chip [Member]
                      
Segment Reporting Information [Line Items]                      
Net revenues                 35,333 38,083 55,154
Income (loss) from operations                 (28,204) (27,409) (16,294)
Total assets 21,370       21,105       21,370 21,105 30,701
Depreciation and amortization                 3,232 3,568 3,570
Operating Segments [Member] | Picor [Member]
                      
Segment Reporting Information [Line Items]                      
Net revenues                 10,416 9,724 13,183
Income (loss) from operations                 (3,326) (2,786) (1,239)
Total assets 4,308       5,365       4,308 5,365 7,098
Depreciation and amortization                 407 414 458
Operating Segments [Member] | Corporate [Member]
                      
Segment Reporting Information [Line Items]                      
Net revenues                         
Income (loss) from operations                 (999) (704) (719)
Total assets 81,364       119,007       81,364 119,007 119,231
Depreciation and amortization                 184 1,483 1,474
Eliminations [Member]
                      
Segment Reporting Information [Line Items]                      
Net revenues                 (9,602) (9,219) (10,199)
Income (loss) from operations                         
Total assets (67,987)       (40,403)       (67,987) (40,403) (30,985)
Depreciation and amortization