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Consolidated Financial Statement Details - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 56,579 $ 49,463 $ 42,823
Less: accumulated depreciation (46,666) (41,244) (33,920)
Property and equipment, net 9,913 8,219 8,903
Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 47,817 41,815 35,836
Software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3,988 3,801 3,548
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 950 865 864
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3,824 2,724 2,492
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 0 $ 258 $ 83
Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 1 year    
Minimum | Equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 1 year    
Minimum | Software      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 1 year    
Minimum | Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 1 year    
Minimum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 2 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 3 years    
Maximum | Equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 3 years    
Maximum | Software      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 3 years    
Maximum | Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 3 years    
Maximum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in Years) 8 years