Equity Incentive Plans (Tables)

9 Months Ended

Oct. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Activity Under Equity Incentive Plans and Related Information

A summary of stock option activity under our equity incentive plans and related information is as follows:

	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (In Years)	Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016	68,879,087		$	6.43	7.9	$	505,131
Options granted	1,999,000		12.69
Options exercised	(6,111,682	)	1.75
Options forfeited/cancelled	(2,196,344	)	11.67
Balance as of October 31, 2016	62,570,061		$	6.90	7.3	$	400,802
Vested and exercisable as of October 31, 2016	27,652,418		$	3.59	6.4	$	250,249

Summary of Restricted Stock Unit Activity Under 2015 Plan

A summary of the restricted stock unit activity under our 2015 Plan and related information is as follows:

	Number of Restricted Stock Units Outstanding		Weighted- Average Grant Date Fair Value
Unvested Balance as of January 31, 2016	53,000		$	16.98
Granted	8,906,750		13.36
Vested	(622,500	)	14.13
Forfeited	(309,878	)	13.69
Unvested Balance as of October 31, 2016	8,027,372		$	13.32

Summarizes the Components of Stock-Based Compensation

The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands):

	Three Months Ended   October 31,				Nine Months Ended   October 31,
	2015		2016		2015		2016
Cost of revenue—product	$	43	$	138	$	139	$	425
Cost of revenue—support	657		1,178		1,511		3,982
Research and development	8,195		15,241		18,624		40,875
Sales and marketing	4,559		8,468		10,539		24,719
General and administrative	2,085		3,210		5,385		9,128
Total stock-based compensation expense	$	15,539	$	28,235	$	36,198	$	79,129