Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenue	$ 47,744	$ 29,029	$ 128,817	$ 77,003
Cost of revenue	9,744	5,940	26,562	15,001
Gross profit	38,000	23,089	102,255	62,002
Operating expenses:
Research and development	12,015	6,410	31,385	16,659
Sales and marketing	35,153	25,460	93,201	63,094
General and administrative	9,070	6,864	26,014	17,464
Total operating expenses	56,238	38,734	150,600	97,217
Loss from operations	(18,238)	(15,645)	(48,345)	(35,215)
Other income (expense):
Interest income	158	47	448	65
Interest expense	(20)	(54)	(47)	(83)
Other expense, net	(163)	(381)	(196)	(195)
Loss before income taxes	(18,263)	(16,033)	(48,140)	(35,428)
Income tax provision (benefit)	92	(104)	153	(104)
Net loss	$ (18,355)	$ (15,929)	$ (48,293)	$ (35,324)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.37)	$ (0.70)	$ (1.01)	$ (1.94)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	48,953	22,847	48,001	18,182