Net Loss Per Share - Computation of Net Loss Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net loss	$ (18,071)	$ (15,119)
Denominator:
Weighted average shares used to compute net loss per share, basic and diluted	50,224	47,190
Net loss per share-basic and diluted	$ (0.36)	$ (0.32)