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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Intangible Assets Net Excluding Goodwill [Abstract]    
Amortization expense recognized $ 0.3 $ 0.4
Amortization expense for remainder of 2021 0.9  
Amortization expense for 2022 1.0  
Amortization expense for 2023 0.9  
Amortization expense for 2024 0.8  
Amortization expense for 2025 $ 0.7