Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 63,440	$ 42,928	$ 122,047	$ 81,073
Cost of revenue	11,778	8,952	23,433	16,818
Gross profit	51,662	33,976	98,614	64,255
Operating expenses:
Research and development	14,741	10,616	30,710	19,370
Sales and marketing	40,382	29,365	79,168	58,048
General and administrative	10,833	8,960	21,069	16,944
Total operating expenses	65,956	48,941	130,947	94,362
Loss from operations	(14,294)	(14,965)	(32,333)	(30,107)
Other income (expense):
Interest income	250	149	471	290
Interest expense	(21)	(13)	(42)	(27)
Other expense, net	(126)	(31)	(237)	(33)
Loss before income taxes	(14,191)	(14,860)	(32,141)	(29,877)
Income tax provision (benefit)	(61)	(41)	60	61
Net loss	$ (14,130)	$ (14,819)	$ (32,201)	$ (29,938)
Net loss per share, basic and diluted (in usd per share)	$ (0.28)	$ (0.31)	$ (0.63)	$ (0.63)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	51,328	48,150	50,779	47,523