Equity Incentive Plans (Tables)

3 Months Ended

Apr. 30, 2016

Disclosure Of Compensation Related Costs Sharebased 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		1,891,000			12.75
Options exercised		(2,181,055	)		1.40
Options cancelled		(691,251	)		11.27
Balance as of April 30, 2016		67,897,781		$	6.72	7.7		$	562,758
Vested and exercisable as of April 30, 2016		25,495,004		$	2.64	6.6		$	304,484
Vested and expected to vest as of April 30, 2016		65,641,943		$	6.64	7.7		$	549,018

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		4,334,600			14.27
Vested		—			—
Forfeited / cancelled		(10,500	)		13.91
Unvested balance as of April 30, 2016		4,377,100		$	14.30
Expected to vest as of April 30, 2016		4,144,238		$	14.30

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,
	2015		2016
Cost of revenue—product	$	56	$	102
Cost of revenue—support		333		1,051
Research and development		3,625		11,220
Sales and marketing		3,444		7,237
General and administrative		1,401		2,524
Total stock-based compensation expense	$	8,859	$	22,134