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Segment Information - Significant Segment Financial Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Net revenues $ 73,720 $ 78,035 $ 74,196 $ 65,269 $ 58,771 $ 56,888 $ 57,709 $ 54,462 $ 291,220 $ 227,830 $ 200,280
Income (loss) from operations                 32,059 (1,360) (6,314)
Total assets 221,068       165,724       221,068 165,724 154,067
Depreciation and amortization                 9,254 8,893 8,438
Capital expenditures                 18,211 12,545 8,428
BBU [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues                 186,704    
VI Chip [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues                 81,674    
Picor [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues                 22,842    
Operating Segments [Member] | BBU [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues                 186,715 151,789 151,428
Income (loss) from operations                 22,544 5,615 11,750
Total assets 279,671       232,255       279,671 232,255 196,987
Depreciation and amortization                 3,621 3,907 4,258
Capital expenditures                 2,954 3,188 2,325
Operating Segments [Member] | VI Chip [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues                 84,728 61,330 39,947
Income (loss) from operations                 3,612 (11,495) (16,494)
Total assets 56,619       34,809       56,619 34,809 21,389
Depreciation and amortization                 3,504 2,782 2,235
Capital expenditures                 13,386 7,505 4,041
Operating Segments [Member] | Picor [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues                 34,552 26,297 16,684
Income (loss) from operations                 7,517 5,400 (637)
Total assets 14,869       13,509       14,869 13,509 8,583
Depreciation and amortization                 792 747 545
Capital expenditures                 621 1,249 1,178
Operating Segments [Member] | Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) from operations                 (1,614) (880) (933)
Total assets 85,851       59,550       85,851 59,550 73,253
Depreciation and amortization                 1,337 1,457 1,400
Capital expenditures                 1,250 603 884
Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Net revenues [1]                 (14,775) (11,586) (7,779)
Total assets [1] $ (215,942)       $ (174,399)       $ (215,942) $ (174,399) $ (146,145)
[1] The elimination for net revenues is principally related to inter-segment revenues of Picor to BBU and VI Chip and for inter-segment revenues of VI Chip to BBU. The elimination for total assets is principally related to inter-segment accounts receivable due to BBU for the funding of VI Chip and Picor operations.