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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Schedule of Investments [Line Items]    
Other assets, net $ 1,622 $ 897
ViaCyte, Inc. [Member]    
Schedule of Investments [Line Items]    
Other assets, net 479 479
Other Noncurrent Assets [Member]    
Schedule of Investments [Line Items]    
Other assets, net $ 1,143 $ 418