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Balance Sheet Details - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 6,891 $ 6,489
Accumulated depreciation (4,229) (3,408)
Property and equipment, net 2,662 3,081
Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,076 1,087
Computers and Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,868 2,718
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,642 1,317
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,305 1,141
Construction-in-Process    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross   $ 226