Equity Incentive Plans (Tables)

6 Months Ended

Jul. 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 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	1,979,000		12.70
Options exercised	(4,258,667	)	1.57
Options forfeited/cancelled	(1,492,727	)	11.09
Balance as of July 31, 2016	65,106,693		$	6.83	7.5	$	432,684
Vested and exercisable as of July 31, 2016	26,456,291		$	3.16	6.5	$	254,711

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	5,513,900		13.46
Vested	(264,648	)	14.38
Forfeited	(134,734	)	14.51
Unvested Balance as of July 31, 2016	5,167,518		$	13.42

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,
	2015		2016		2015		2016
Cost of revenue—product	$	40	$	181	$	96	$	287
Cost of revenue—support	521		1,712		854		2,804
Research and development	6,804		13,976		10,429		25,634
Sales and marketing	2,536		8,732		5,980		16,251
General and administrative	1,899		3,295		3,300		5,918
Total stock-based compensation expense	$	11,800	$	27,896	$	20,659	$	50,894