Quarterly report pursuant to Section 13 or 15(d)

Business Combinations Business Combinations (Details 1)

v3.4.0.3
Business Combinations Business Combinations (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2015
Oct. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2016
Entropic Communications [Member]            
Business Acquisition [Line Items]            
Business Combination, Consideration Transferred $ 289,400          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 173,800          
Business Combination, Consideration Transferred, Liabilities Incurred 4,500          
Payments to Acquire Businesses, Gross $ 111,100          
Physpeed [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross   $ 9,300        
Business Acquisition, Percentage of Voting Interests Acquired   100.00%        
Escrow Deposit   $ 1,100        
Continued Employment [Member]            
Business Acquisition [Line Items]            
Business Combination, Additional Consideration, Quarterly Installments   200        
Continued Employment [Member] | Physpeed [Member]            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration, Liability   1,700        
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized   100 $ 50   $ 70  
Earn-out Consideration [Member] | Physpeed [Member]            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration, Liability   300 241 $ 82 400  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 750        
Payment of Contingent Consideration     (240) $ 0    
Scenario, Forecast [Member] | Earn-out Consideration [Member] | Physpeed [Member]            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration Arrangements, Base Amount Multiplied by Revenue Percent           $ 375
Contingent Consideration [Member] | Fair Value, Measurements, Recurring [Member] | Earn-out Consideration [Member]            
Business Acquisition [Line Items]            
Available-for-sale Securities, Debt Securities, Current     241      
Physpeed, 2015 Restricted Stock Unit Plan [Member] | Physpeed [Member]            
Business Acquisition [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   14 months        
Physpeed, 2016 Restricted Stock Unit Plan [Member] | Physpeed [Member]            
Business Acquisition [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   26 months        
Restricted Stock Units (RSUs) [Member] | Physpeed [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation     $ 1,000   $ 1,900