Net Loss Per Share - Computation of Earnings Per Share Basic and Diluted (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net loss	$ (11,719)	$ (2,079)	$ (14,335)	$ (1,685)
Net loss available to ordinary shareholders - basic and diluted	$ (11,719)	$ (2,079)	$ (14,335)	$ (1,685)
Denominator:
Weighted-average shares outstanding - basic and diluted	14,376,547	288,661	13,584,197	263,088
Loss per share - basic and diluted	$ (0.82)	$ (7.20)	$ (1.06)	$ (6.41)