Equity Incentive Plans (Tables)

3 Months Ended

Apr. 30, 2018

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, 2018	46,359,949		$	7.75	6.3	$	574,224
Options exercised	(2,193,658	)	4.40
Options forfeited/canceled	(1,019,718	)	8.25
Balance as of April 30, 2018	43,146,573		$	7.91	6.1	$	531,452
Vested and exercisable as of April 30, 2018	28,635,271		$	5.66	5.6	$	417,279

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		Aggregate Intrinsic Value (in thousands)
Unvested balance as of January 31, 2018	17,682,646		$	12.60	$	356,117
Granted	6,364,772		20.06
Vested	(2,013,408	)	11.70
Forfeited	(437,921	)	13.68
Converted	(1,142,838	)	11.86
Unvested balance as of April 30, 2018	20,453,251		$	15.01	$	413,588

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   April 30,
	2017		2018
Cost of revenue—product	$	397	$	608
Cost of revenue—support subscription	1,774		2,684
Research and development	15,588		21,090
Sales and marketing	10,626		13,940
General and administrative	3,834		5,633
Total stock-based compensation expense	$	32,219	$	43,955