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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended
Sep. 08, 2017
Jul. 25, 2017
Jun. 11, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                  
Acquired intangible assets amortize over an estimated weighted average useful life               4 years 9 months 18 days  
Net revenue       $ 430.4 $ 461.3     $ 847.8 $ 847.5
Operating loss       $ 24.0 $ (28.8)     $ 40.9 $ (34.4)
Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets amortize over an estimated weighted average useful life               3 years 7 months 6 days  
Backlog [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets amortize over an estimated weighted average useful life               6 months  
Conexant Systems, LLC [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets   $ 152.5              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member]                  
Business Acquisition [Line Items]                  
Acquisition agreement date     Jun. 11, 2017            
Acquisition closing effective date   Jul. 25, 2017              
Purchase price of acquisition   $ 305.4              
Issuance of common stock for acquisition, shares   726,666              
Issuance of common stock for acquisition, value   $ 39.1              
Business acquisition stock appreciation rights liability   3.5              
Purchase price held in escrow   16.8              
Business combination purchase price adjustment   1.8              
Business combination, consideration transferred   346.2              
Acquired intangible assets   $ 152.5              
Net revenue             $ 57.4    
Operating loss             $ 27.2    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Identified intangible assets included discount rates   14.00%              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Identified intangible assets included discount rates   9.00%              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Developed Technology [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets   $ 115.3              
Acquired intangible assets amortize over an estimated weighted average useful life   5 years              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets   $ 32.1              
Acquired intangible assets amortize over an estimated weighted average useful life   4 years              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Trademarks [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets   $ 4.8              
Acquired intangible assets amortize over an estimated weighted average useful life   7 years              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets   $ 0.3              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets amortize over an estimated weighted average useful life   1 year              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Escrow Obligations Under Purchase Agreement [Member]                  
Business Acquisition [Line Items]                  
Purchase price held in escrow   $ 7.0              
Marvell Technology Group Ltd [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets $ 45.6                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member]                  
Business Acquisition [Line Items]                  
Acquisition agreement date     Jun. 11, 2017            
Acquisition closing effective date Sep. 08, 2017                
Purchase price of acquisition $ 93.7                
Acquired intangible assets $ 45.6                
Net revenue           $ 63.1      
Operating loss           $ 9.1      
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Identified intangible assets included discount rates 18.00%                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Identified intangible assets included discount rates 9.00%                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Developed Technology [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets $ 31.7                
Acquired intangible assets amortize over an estimated weighted average useful life 4 years                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets $ 12.7                
Acquired intangible assets amortize over an estimated weighted average useful life 4 years                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets $ 1.2                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets amortize over an estimated weighted average useful life 1 year                
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | In-Process Research and Development [Member]                  
Business Acquisition [Line Items]                  
Acquired intangible assets $ 14.3