Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Details - Property and Equipment (Details 3)

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Balance Sheet Details - Property and Equipment (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 71,774   $ 72,191
Less accumulated depreciation and amortization (54,787)   (53,787)
Property and equipment, net 16,987   18,404
Depreciation $ 2,100 $ 3,100  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Property and equipment, gross $ 2,183   2,020
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 34,710   34,225
Machinery and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Machinery and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Masks and production equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 12,645   12,645
Masks and production equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 2 years    
Masks and production equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Software      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Property and equipment, gross $ 5,677   5,675
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 16,199   17,493
Leasehold improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 1 year    
Leasehold improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 360   $ 133