Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers (Details)

v3.8.0.1
Revenue from Contracts with Customers (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]        
Customer contract liabilities $ 114,000   $ 0  
Accrued price protection liability 20,212,000 $ 21,947,000 21,571,000 $ 15,176,000
Revenues 110,827,000 88,841,000    
Connected Home [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 65,658,000 77,240,000    
Infrastructure [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 20,490,000 11,534,000    
Industrial and multi-market [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 24,679,000 $ 67,000    
Sales Revenue, Net [Member] | Connected Home [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration Risk, Percentage 59.00% 87.00%    
Sales Revenue, Net [Member] | Infrastructure [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration Risk, Percentage 19.00% 13.00%    
Sales Revenue, Net [Member] | Industrial and multi-market [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration Risk, Percentage 22.00% 0.00%    
Price Adjustments [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Accrued customer obligations     $ 0  
Right of Return Asset [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Other Assets $ 100,000      
Accounts Receivable [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Asset Impairment Charges $ 0