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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 24,218 $ 22,291
Less accumulated depreciation (10,954) (8,505)
Property and equipment, net 13,264 13,786
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,116 3,274
Lab and clean room equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 9,316 8,666
Furniture and office equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 9,203 7,051
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,583 $ 3,300