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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment      
Less: accumulated depreciation $ (3,708) $ (3,138) $ (1,528)
Total property and equipment, net 19,968 13,528 6,180
Lab equipment      
Property, Plant and Equipment      
Property and equipment, gross 10,771 10,473 4,141
Office equipment      
Property, Plant and Equipment      
Property and equipment, gross 1,610 1,019 950
Furniture and fixtures      
Property, Plant and Equipment      
Property and equipment, gross 599 594 517
Leasehold improvements      
Property, Plant and Equipment      
Property and equipment, gross 2,076 2,124 2,100
Assets under construction      
Property, Plant and Equipment      
Property and equipment, gross $ 8,620 $ 2,456 $ 0