Net Loss Per Share - Computation of Net Loss Per Share Attributable to Common Stockholders, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net loss	$ (15,119)	$ (10,183)
Denominator:
Weighted average shares used to compute net loss per share attributable to common stockholder, basic and diluted	47,190	15,756
Net loss per share-basic and diluted	$ (0.32)	$ (0.65)