Net Loss Per Share - Computation of Earnings Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net loss	$ (33,878)	$ (59,059)	$ (10,165)
Net loss available to ordinary shareholders - basic and diluted	$ (33,878)	$ (59,059)	$ (10,165)
Denominator:
Weighted-average shares outstanding - basic and diluted	19,558,152	14,773,386	186,817
Loss per share - basic and diluted	$ (1.73)	$ (4.00)	$ (54.41)