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Consolidated financial statement details - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Depreciation $ 24,800 $ 16,800 $ 10,900
Gross property and equipment 120,290 71,356  
Less: Accumulated depreciation and amortization (50,240) (29,800)  
Property and equipment, net 70,050 41,556  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 40,841 22,787  
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 4 years    
Gross property and equipment $ 25,174 8,755  
Tooling [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 19,537 16,159  
Computer Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 2 years    
Gross property and equipment $ 14,581 9,731  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 3 years    
Gross property and equipment $ 11,389 6,150  
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 4,632 3,944  
Tradeshow Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 4,136 $ 3,830  
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 1 year    
Minimum [Member] | Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 3 years    
Minimum [Member] | Tooling [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 1 year    
Minimum [Member] | Tradeshow Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 2 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years    
Maximum [Member] | Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years    
Maximum [Member] | Tooling [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 2 years    
Maximum [Member] | Tradeshow Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 5 years