Equity Incentive Plans (Tables)

3 Months Ended

Apr. 30, 2017

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, 2017	56,840,189		$	7.15	7.0	$	315,502
Options granted	—		—
Options exercised	(1,340,121	)	1.84
Options forfeited/cancelled	(605,324	)	12.74
Balance as of April 30, 2017	54,894,744		$	7.22	6.7	$	273,338
Vested and exercisable as of April 30, 2017	30,739,000		$	4.45	6.0	$	208,957

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, 2017	8,783,024		$	13.06	$	99,863
Granted	8,014,950		10.19		—
Vested	(794,543	)	10.38		—
Forfeited	(376,522	)	12.18		—
Unvested Balance as of April 30, 2017	15,626,909		$	11.74	$	165,802

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,
	2016		2017
Cost of revenue—product	$	106	$	397
Cost of revenue—support	1,092		1,774
Research and development	11,658		15,588
Sales and marketing	7,519		10,626
General and administrative	2,623		3,834
Total stock-based compensation expense	$	22,998	$	32,219