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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Schedule of Investments [Line Items]    
Other assets, net $ 1,602 $ 1,446
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 $ 1,123 $ 967