Annual report pursuant to Section 13 and 15(d)

Business Combination Business Combinations (Details Textuals)

v3.8.0.1
Business Combination Business Combinations (Details Textuals) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 12, 2017
Apr. 04, 2017
Jul. 01, 2016
Apr. 28, 2016
Oct. 31, 2014
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                  
Goodwill             $ 237,992 $ 76,015 $ 49,779
Physpeed [Member]                  
Business Acquisition [Line Items]                  
Business Acquisition, Date of Acquisition Agreement         Oct. 31, 2014        
Cash         $ 9,250        
Wireless Infrastructure Backhaul Business of Broadcom Corporation [Member]                  
Business Acquisition [Line Items]                  
Total purchase consideration     $ 80,000            
Business Acquisition, Name of Acquired Entity     wireless infrastructure backhaul business            
Goodwill, Purchase Accounting Adjustments             (341) $ 0  
Business Acquisition, Effective Date of Acquisition     Jul. 01, 2016            
G.hn business of Marvell [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation   $ (2)              
Business Acquisition, Effective Date of Acquisition   Apr. 04, 2017              
Business Acquisition, Goodwill   $ 2,325              
Wireless Infrastructure Access Line Business of of Microsemi Storage Solutions, Inc. [Member]                  
Business Acquisition [Line Items]                  
Total purchase consideration       $ 21,000          
Business Acquisition, Name of Acquired Entity     wireless infrastructure access business            
Business Acquisition, Effective Date of Acquisition       Apr. 28, 2016          
Exar Corporation [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation $ (5,253)                
Goodwill 159,993                
Total purchase consideration $ 692,727                
Business Acquisition, Name of Acquired Entity Exar Corporation                
Business Acquisition, Effective Date of Acquisition May 12, 2017                
Exar and G.hn business [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual             85,730    
Earnings of acquiree since acquisition             52,015    
Business Combination, Amortization of Intangible Assets and Inventory Step Up             37,807    
Business Combination, Transaction Costs             10,039    
Restricted Stock Units (RSUs) [Member]                  
Business Acquisition [Line Items]                  
Payment of Contingent Consideration           $ 860      
Restricted Stock Units (RSUs) [Member] | Physpeed [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation           1,600      
Cash [Member]                  
Business Acquisition [Line Items]                  
Payment of Contingent Consideration           $ 760      
Deferred Revenue [Member] | Exar Corporation [Member]                  
Business Acquisition [Line Items]                  
Deferred Revenue Eliminated in Acquisition Accounting             6,079    
Deferred Profit [Member] | Exar Corporation [Member]                  
Business Acquisition [Line Items]                  
Deferred Profit Eliminated in Acquisition Accounting             $ 4,682