Quarterly report pursuant to Section 13 or 15(d)

Business Combinations Business Combination - G.hn Business of Marvell (Details)

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Business Combinations Business Combination - G.hn Business of Marvell (Details) - G.hn business of Marvell [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 04, 2017
Sep. 30, 2017
Sep. 30, 2017
Business Acquisition [Line Items]      
Goodwill, Purchase Accounting Adjustments   $ 100  
Payments to Acquire Businesses, Gross $ 21,000    
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Fair Value Mark Up On Inventory 1,246    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   2,084 $ 2,084
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 147    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property and Equipment 3,277    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 12,600    
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 875    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 28    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable (1)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Expenses (234)    
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation (2)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other (99)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 18,675    
Business Acquisition, Goodwill $ 2,325    
Business Acquisition, Effective Date of Acquisition Apr. 04, 2017    
Payments to Acquire Businesses, Gross $ 21,000    
Finite-lived Intangible Assets Acquired $ 12,600    
Cost of Sales [Member]      
Business Acquisition [Line Items]      
Business Combination, Amortization of Inventory Step-Up   $ 0 $ 1,200
Order or Production Backlog [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 months    
Finite-lived Intangible Assets Acquired $ 500    
Developed technology      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years    
Finite-lived Intangible Assets Acquired $ 7,100    
Customer-Related Intangible Assets [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 1 year 9 months 18 days    
Finite-lived Intangible Assets Acquired $ 4,800    
Noncompete Agreements [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years    
Finite-lived Intangible Assets Acquired $ 200    
Cash [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 21,000