Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Details - Property and Equipment (Detail)

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Balance Sheet Details - Property and Equipment (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 47,043 $ 27,734
Less accumulated depreciation and amortization (26,500) (15,293)
Property and equipment, net $ 20,543 12,441
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Property and equipment, Gross $ 2,388 735
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 22,997 12,695
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 $ 8,062 8,672
Software [Member]    
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Property and equipment, Gross $ 3,020 905
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 10,492 4,451
Leasehold improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Useful life 4 years  
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 $ 84 $ 276