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, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 24,020 $ 16,347
Less accumulated depreciation and amortization (13,895) (10,836)
Property and equipment, net 10,125 5,511
Furniture and fixtures [Member]
   
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Property and equipment, Gross 714 346
Machinery and equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 12,520 9,488
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 7,441 4,764
Software [Member]
   
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Property and equipment, Gross 798 743
Leasehold improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 2,416 924
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 $ 131 $ 82