Equity Incentive Plans (Tables)

9 Months Ended

Oct. 31, 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	1,000,000		14.92
Options exercised	(5,502,179	)	2.86
Options forfeited/cancelled	(2,362,891	)	14.41
Balance as of October 31, 2017	49,975,119		$	7.43	6.4	$	457,252
Vested and exercisable as of October 31, 2017	30,500,061		$	4.84	5.9	$	355,871

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	14,315,164		11.65
Vested	(3,627,367	)	12.33
Forfeited	(1,292,330	)	11.75
Unvested Balance as of October 31, 2017	18,178,491		$	12.21	$	298,674

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,
	2016		2017		2016		2017
Cost of revenue—product	$	138	$	143	$	425	$	898
Cost of revenue—support	1,178		2,422		3,982		6,441
Research and development	15,241		18,073		40,875		51,632
Sales and marketing	8,468		12,104		24,719		34,169
General and administrative	3,210		6,121		9,128		14,780
Total stock-based compensation expense	$	28,235	$	38,863	$	79,129	$	107,920