Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 84,685	$ 63,440	$ 164,783	$ 122,047
Cost of revenue	15,694	11,778	30,671	23,433
Gross profit	68,991	51,662	134,112	98,614
Operating expenses:
Research and development	18,266	14,741	36,532	30,710
Sales and marketing	51,261	40,382	100,622	79,168
General and administrative	14,305	10,833	28,247	21,069
Total operating expenses	83,832	65,956	165,401	130,947
Loss from operations	(14,841)	(14,294)	(31,289)	(32,333)
Other income (expense):
Interest income	512	250	969	471
Interest expense	(21)	(21)	(43)	(42)
Other income (expense), net	(152)	(126)	162	(237)
Loss before income taxes	(14,502)	(14,191)	(30,201)	(32,141)
Income tax provision (benefit)	189	(61)	424	60
Net loss	$ (14,691)	$ (14,130)	$ (30,625)	$ (32,201)
Net loss per share, basic and diluted (in usd per share)	$ (0.27)	$ (0.28)	$ (0.57)	$ (0.63)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	54,699	51,328	54,201	50,779