Equity Incentive Plans (Tables)

9 Months Ended

Oct. 31, 2015

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, 2015		54,284,474		$	3.02		8.3	$	523,654
Options granted		18,159,824			15.77
Options exercised		(1,784,066	)		2.64
Options cancelled		(1,730,681	)		7.09
Balance as of October 31, 2015		68,929,551			6.29
Vested and exercisable as of October 31, 2015		21,903,812			1.71		6.8	$	348,767
Vested and expected to vest as of October 31, 2015		66,851,238			6.22		8.1	$	763,519

Summary of Estimated Fair Value of Employee Purchase Plan

We estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:

	Three Months Ended October 31,					Nine Months Ended October 31,
	2014		2015			2014		2015
Expected term (in years)		—		0.4 – 1.9			—		0.4 – 1.9
Expected volatility		—	49		%		—	49		%
Risk-free interest rate		—	0.1% - 0.7		%		—	0.1% - 0.7		%
Dividend rate		—		—			—		—

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,
	2014		2015		2014		2015
Cost of revenue—product	$	35	$	43	$	264	$	139
Cost of revenue—support		159		657		1,057		1,511
Research and development		3,399		8,195		18,546		18,624
Sales and marketing		2,315		4,559		19,676		10,539
General and administrative		823		2,085		5,331		5,385
Total stock-based compensation expense	$	6,731	$	15,539	$	44,874	$	36,198