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Share-Based Compensation - Summary of Share Option Activity (Detail) - $ / shares
9 Months Ended 12 Months Ended
Oct. 31, 2019
Jul. 16, 2019
Dec. 31, 2019
Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Number of Share Options Outstanding, Beginning Balance     1,936,397  
Number of Share Options Outstanding, Granted 57,106 28,517 85,623  
Number of Share Options Outstanding, Exercised     (85,920)  
Number of Share Options Outstanding, Forfeited     (76,121)  
Number of Share Options Outstanding, Ending Balance     1,859,979 1,936,397
Number of Share Options Outstanding, Exercisable     1,513,110  
Weighted-Average Exercise Price, Beginning Balance     $ 7.77  
Weighted-Average Exercise Price, Granted     8.69  
Weighted-Average Exercise Price, Exercised     4.70  
Weighted-Average Exercise Price, Forfeited     12.84  
Weighted-Average Exercise Price, Ending Balance     7.75 $ 7.77
Weighted-Average Exercise Price, Exercisable     $ 7.91  
Weighted-Average Remaining Contractual Life, Outstanding     70 months 78 months
Weighted-Average Remaining Contractual Life, Granted     120 months  
Weighted-Average Remaining Contractual Life, Exercisable     63 months