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Employee Stock Purchase Plan - Additional Information (Detail) - 2019 ESPP [Member]
12 Months Ended
Sep. 30, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ordinary shares, discount rate 10.00%
Number of ordinary shares issued 0
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Eligible employees contribution from their eligible compensation during each semi annual 1.00%
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Eligible employees contribution from their eligible compensation during each semi annual 15.00%
Number of ordinary shares issued 500,000