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
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 15,603 $ 15,165
Less accumulated depreciation and amortization (9,053) (8,299)
Property and equipment, net 6,550 6,866
Furniture and fixtures [Member]
   
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Property and equipment, Gross 366 355
Machinery and equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 8,520 8,331
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 5,125 4,894
Software [Member]
   
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Property and equipment, Gross 729 736
Leasehold improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 839 829
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 $ 24 $ 20