Net Loss Per Share - Computation of Earnings Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net loss	$ (16,235)	$ (10,154)
Net loss available to ordinary shareholders - basic and diluted	$ (16,235)	$ (10,154)
Denominator:
Weighted-average shares outstanding - basic and diluted	25,410,598	17,025,631
Loss per share - basic and diluted	$ (0.64)	$ (0.60)