Share-Based Compensation - Summary of Share Option Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Share Options Outstanding, Beginning Balance	1,208,118	779,462	369,400
Number of Share Options Outstanding, Granted	404,327	605,250	477,149
Number of Share Options Outstanding, Exercised	(8,712)	(137,478)	(60,044)
Number of Share Options Outstanding, Forfeited	(13,795)	(39,116)	(7,043)
Number of Share Options Outstanding, Ending Balance	1,589,938	1,208,118	779,462	369,400
Number of Share Options Outstanding, Exercisable	662,261
Weighted-Average Exercise Price, Beginning Balance	$ 5.58	$ 2.92	$ 1.44
Weighted-Average Exercise Price, Granted	14.71	8.34	4.21
Weighted-Average Exercise Price, Exercised	4.72	2.23	4.08
Weighted-Average Exercise Price, Forfeited	10.25	7.93	4.87
Weighted-Average Exercise Price, Ending Balance	7.86	$ 5.58	$ 2.92	$ 1.44
Weighted-Average Exercise Price, Exercisable	$ 4.37
Weighted-Average Remaining Contractual Life, Outstanding	96 months	103 months	109 months	116 months
Weighted-Average Remaining Contractual Life, Granted	120 months	120 months	120 months
Weighted-Average Remaining Contractual Life, Exercisable	88 months