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 ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation   $ 12,000  
Property and equipment, Gross $ 75,956   $ 72,191
Less accumulated depreciation and amortization (59,343)   (53,787)
Property and equipment, net $ 16,613   18,404
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Property and equipment, Gross $ 2,199   2,020
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 35,660   34,225
Machinery and equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Machinery and equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Masks and production equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 15,209   12,645
Masks and production equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Masks and production equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Software and Software Development Costs [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 5,956   5,675
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 16,186   17,493
Leasehold improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Leasehold improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 746   $ 133