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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets Net Excluding Goodwill [Abstract]    
Amortization expense recognized $ 0.5 $ 0.1
Amortization expense for remainder of 2019 1.4  
Amortization expense for 2020 1.5  
Amortization expense for 2021 1.2  
Amortization expense for 2022 1.0  
Amortization expense for 2023 $ 0.9