Annual report pursuant to Section 13 and 15(d)

Balance Sheet Details - Property and Equipment (Detail)

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Balance Sheet Details - Property and Equipment (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 16,347,000 $ 15,165,000
Less accumulated depreciation and amortization (10,836,000) (8,299,000)
Property and equipment, net 5,511,000 6,866,000
Production Mask Impairment Charge 1,100,000  
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 9,488,000 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 4,764,000 4,894,000
Software [Member]
    
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Property and equipment, Gross 743,000 736,000
Leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 924,000 829,000
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 $ 82,000 $ 20,000