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Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 136,305 $ 155,220,000  
Less: Accumulated depreciation and amortization (112,594) (118,681,000)  
Property and equipment, net 23,711,000 36,539,000  
Depreciation 14,500,000 18,500,000 $ 23,600,000
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 35,180 50,736,000  
Production, engineering and other equipment [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 48,908 45,649,000  
Tooling [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 17,635 19,216,000  
Computers and software [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 22,385 21,719,000  
Furniture and office equipment [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 6,315 10,846,000  
Tradeshow Equipment and other [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment 5,860 7,009,000  
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 22 $ 45,000