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Share-Based Compensation - Summary of Share Option Activity (Detail) - $ / shares
6 Months Ended 12 Months Ended
Aug. 09, 2017
May 24, 2017
Sep. 30, 2017
Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Number of Share Options Outstanding, Beginning Balance     1,948,917  
Number of Share Options Outstanding, Granted 4,000 305,525 309,525  
Number of Share Options Outstanding, Exercised     (33,520)  
Number of Share Options Outstanding, Forfeited     (17,200)  
Number of Share Options Outstanding, Ending Balance     2,207,722 1,948,917
Number of Share Options Outstanding, Exercisable     1,420,382  
Weighted-Average Exercise Price, Beginning Balance     $ 8.04  
Weighted-Average Exercise Price, Granted     7.55  
Weighted-Average Exercise Price, Exercised     3.21  
Weighted-Average Exercise Price, Forfeited     11.14  
Weighted-Average Exercise Price, Ending Balance     8.02 $ 8.04
Weighted-Average Exercise Price, Exercisable     $ 7.40  
Weighted-Average Remaining Contractual Life, Outstanding     89 months 90 months
Weighted-Average Remaining Contractual Life, Granted     120 months  
Weighted-Average Remaining Contractual Life, Exercisable     78 months