Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 68,096	$ 47,744	$ 190,143	$ 128,817
Cost of revenue	12,627	9,744	36,060	26,562
Gross profit	55,469	38,000	154,083	102,255
Operating expenses:
Research and development	14,377	12,015	45,087	31,385
Sales and marketing	43,458	35,153	122,626	93,201
General and administrative	11,578	9,070	32,647	26,014
Total operating expenses	69,413	56,238	200,360	150,600
Loss from operations	(13,944)	(18,238)	(46,277)	(48,345)
Other income (expense):
Interest income	325	158	796	448
Interest expense	(21)	(20)	(63)	(47)
Other expense, net	(280)	(163)	(517)	(196)
Loss before income taxes	(13,920)	(18,263)	(46,061)	(48,140)
Income tax provision (benefit)	(37)	92	23	153
Net loss	$ (13,883)	$ (18,355)	$ (46,084)	$ (48,293)
Net loss per share, basic and diluted (in usd per share)	$ (0.27)	$ (0.37)	$ (0.90)	$ (1.01)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	52,328	48,953	51,297	48,001