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 $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Supplemental Balance Sheet Disclosures [Abstract]    
Production Mask Impairment Charge $ 1,100,000  
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 16,011,000 15,165,000
Less accumulated depreciation and amortization (10,121,000) (8,299,000)
Property and equipment, net 5,890,000 6,866,000
Furniture and fixtures [Member]
    
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Property and equipment, Gross 346,000 355,000
Machinery and equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 9,216,000 8,331,000
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 4,756,000 4,894,000
Software [Member]
    
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Property and equipment, Gross 728,000 736,000
Leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 854,000 829,000
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 $ 111,000 $ 20,000