Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Details - Property and Equipment (Details 3)

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Balance Sheet Details - Property and Equipment (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Depreciation $ 3,100 $ 2,200  
Property and equipment, Gross 69,067   $ 66,711
Less accumulated depreciation and amortization (47,074)   (44,053)
Property and equipment, net $ 21,993   22,658
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Property and equipment, Gross $ 2,103   2,105
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 34,221   33,462
Machinery and equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Machinery and equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Masks and production equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 2 years    
Property and equipment, Gross $ 11,788   11,470
Software and Software Development Costs [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Property and equipment, Gross $ 4,704   4,695
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 14,271   14,340
Leasehold improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 1 year    
Leasehold improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 1,980   $ 639