Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 181,309	$ 110,391	$ 63,174
Cost of revenue	37,183	21,802	10,780
Gross profit	144,126	88,589	52,394
Operating expenses:
Research and development	46,394	24,024	16,496
Sales and marketing	129,677	89,162	58,156
General and administrative	35,693	25,319	17,178
Total operating expenses	211,764	138,505	91,830
Loss from operations	(67,638)	(49,916)	(39,436)
Other income (expense):
Interest income	647	176	16
Interest expense	(68)	(104)	(64)
Other expense, net	(126)	(390)	(741)
Loss before income taxes	(67,185)	(50,234)	(40,225)
Income tax provision (benefit)	302	(85)	0
Net loss	$ (67,487)	$ (50,149)	$ (40,225)
Net loss per share attributable to common stockholders, basic and diluted	$ (1.39)	$ (1.98)	$ (2.58)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	48,410	25,290	15,596