Equity Incentive Plans (Tables)

6 Months Ended

Jul. 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	—		—
Options exercised	(2,769,381	)	2.53
Options forfeited/cancelled	(1,266,826	)	14.04
Balance as of July 31, 2017	52,803,982		$	7.23	6.5	$	315,252
Vested and exercisable as of July 31, 2017	31,539,259		$	4.67	5.8	$	248,932

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	9,807,355		10.59		—
Vested	(2,221,800	)	12.46		—
Forfeited	(908,755	)	11.50		—
Unvested Balance as of July 31, 2017	15,459,824		$	11.67	$	186,600

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   July 31,				Six Months Ended   July 31,
	2016		2017		2016		2017
Cost of revenue—product	$	181	$	358	$	287	$	755
Cost of revenue—support	1,712		2,245		2,804		4,019
Research and development	13,976		17,971		25,634		33,559
Sales and marketing	8,732		11,439		16,251		22,065
General and administrative	3,295		4,825		5,918		8,659
Total stock-based compensation expense	$	27,896	$	36,838	$	50,894	$	69,057