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Share-Based Compensation - Summary of Share Option Granted, Exercise Price, Fair Value, Intrinsic Value (Detail) - $ / shares
6 Months Ended
Aug. 09, 2017
May 24, 2017
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Granted 4,000 305,525 309,525
Exercise Price     $ 7.55
Ordinary Shares Fair Value Per Share at Grant Date $ 5.41 $ 7.58  
May 24, 2017      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date     May 24, 2017
Number of Options Granted     305,525
Exercise Price     $ 7.58
Ordinary Shares Fair Value Per Share at Grant Date     7.58
Per Share Intrinsic Value of Options     $ 4.62
August 9, 2017      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date     Aug. 09, 2017
Number of Options Granted     4,000
Exercise Price     $ 5.41
Ordinary Shares Fair Value Per Share at Grant Date     5.41
Per Share Intrinsic Value of Options     $ 3.34