Annual report pursuant to Section 13 and 15(d)

Business Combination Business Combination - Exar (Details)

v3.8.0.1
Business Combination Business Combination - Exar (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
May 12, 2017
Jul. 01, 2016
Apr. 30, 2015
Oct. 31, 2014
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                
Stock based compensation expense           $ 32,668 $ 21,765 $ 19,268
Remaining fair value step-up included in inventory           53,434 26,583  
Contingent consideration payments           0 (220) (130)
Goodwill           237,992 76,015 49,779
Restricted Stock Units (RSUs) [Member]                
Business Acquisition [Line Items]                
Payment of Contingent Consideration         $ 860      
Exar Corporation [Member]                
Business Acquisition [Line Items]                
Finite-lived Intangible Assets Acquired $ 232,900              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 235,810              
Pro Forma Impairment of Intangible Assets           0 1,519  
Business Acquisition, Effective Date of Acquisition May 12, 2017              
Business Acquisition, Name of Acquired Entity Exar Corporation              
Total consideration given $ 692,727              
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Fair Value Mark Up On Inventory 24,286              
Goodwill 159,993              
Identifiable intangible assets $ 249,500              
Average useful life 6 years              
Proceeds from Issuance of Debt $ 416,800              
Long-term Debt, Gross $ 425,000              
Business acquisition, Shares Tendered 51,953,635              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables $ 11,363              
Inventory 48,536              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 2,288              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property and Equipment 3,442              
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 7,493              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 5,434              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 12,385              
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Accrued Expenses and Other Current Liabilities (10,464)              
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation (5,253)              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other 3,030              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 532,734              
Business Combination, Purchase price 692,727              
Business Combination, Indemnification Assets, Amount as of Acquisition Date 5,000       5,000      
Business Combination, Finite and Indefinite Lived Intangible Assets Acquired 249,500              
Exar Corporation [Member] | Developed Technology Rights [Member]                
Business Acquisition [Line Items]                
Finite-lived Intangible Assets Acquired $ 120,900              
Average useful life 7 years              
Exar Corporation [Member] | Trademarks and Trade Names [Member]                
Business Acquisition [Line Items]                
Finite-lived Intangible Assets Acquired $ 12,100              
Average useful life 6 years              
Exar Corporation [Member] | Customer Relationships [Member]                
Business Acquisition [Line Items]                
Finite-lived Intangible Assets Acquired $ 96,300              
Average useful life 5 years              
Exar Corporation [Member] | Backlog [Member]                
Business Acquisition [Line Items]                
Finite-lived Intangible Assets Acquired $ 3,600              
Average useful life 6 months              
Exar Corporation [Member] | Stock Based Awards [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 4,613              
Exar Corporation [Member] | Cash in lieu of equity [Member]                
Business Acquisition [Line Items]                
Total consideration given 12,717              
Wireless Infrastructure Backhaul Business of Broadcom Corporation [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Effective Date of Acquisition   Jul. 01, 2016            
Business Acquisition, Name of Acquired Entity   wireless infrastructure backhaul business            
Total consideration given   $ 80,000            
Entropic Communications [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Date of Acquisition Agreement     Apr. 30, 2015          
Cash     $ 111,125          
Total consideration given     289,391          
Portion of outstanding equity awards deemed to have been outstanding and vested     173,781          
Equity value of shares that were outstanding and vested prior to acquisition     $ 4,485          
Physpeed [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Date of Acquisition Agreement       Oct. 31, 2014        
Cash       $ 9,250        
Percentage of voting interests acquired       100.00%        
Physpeed [Member] | Earn-out Consideration [Member]                
Business Acquisition [Line Items]                
Contingent consideration liability       $ 300        
Contingent consideration, high range of outcomes       $ 750        
Base amount multiplied by revenue percent           375    
Physpeed [Member] | Restricted Stock Units (RSUs) [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation         $ 1,600      
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]                
Business Acquisition [Line Items]                
Payment of Contingent Consideration           (375) (240)  
Cash [Member] | Exar Corporation [Member]                
Business Acquisition [Line Items]                
Total consideration given 688,114              
Cost of Sales [Member]                
Business Acquisition [Line Items]                
Stock based compensation expense           332 $ 210 $ 213
Cost of Sales [Member] | Exar Corporation [Member]                
Business Acquisition [Line Items]                
Business Combination, Amortization of Inventory Step-Up           24,300    
In Process Research and Development [Member] | Exar Corporation [Member]                
Business Acquisition [Line Items]                
Fair Value, indefinite-lived intangible assets acquired $ 16,600         $ 16,600    
Common Stock [Member] | Exar Corporation [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Share Price $ 13.00