Income Taxes (Tables)

12 Months Ended

Jan. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Geographical Breakdown of Income (Loss) before Provision for Income Taxes

The geographical breakdown of income (loss) before provision for income taxes is as follows (in thousands):

	Fiscal Year Ended January 31,
	2014			2015			2016
Domestic	$	(79,588	)	$	(186,922	)	$	(195,019	)
International		1,318			5,028			(17,164	)
Total	$	(78,270	)	$	(181,894	)	$	(212,183	)

Schedule of Components of Provision for Income Taxes

The components of the provision for income taxes are as follows (in thousands):

	Fiscal Year Ended January 31,
	2014		2015		2016
Current:
State		37		56		210
Foreign		162		1,073		2,198
Total		199		1,129		2,408
Deferred:
Foreign		92		208		(839	)
Total provision for income taxes	$	291	$	1,337	$	1,569

Reconciliation of the Federal Statutory Income Tax Rate and Effective Income Tax Rate

The reconciliation of the federal statutory income tax rate and effective income tax rate is as follows:

	Fiscal Year Ended January 31,
	2014			2015			2016
				(inthousands)
Tax at federal statutory rate	$	(26,611	)	$	(61,844	)	$	(72,142	)
State tax, net of federal benefit		32			44			152
Stock-based compensation expense		1,570			5,328			10,866
Research and development tax credits		(1,036	)		(1,999	)		(3,832	)
Foreign rate differential		(194	)		(429	)		7,106
Change in valuation allowance		26,152			60,042			58,979
Other		378			195			440
Provision for income taxes	$	291		$	1,337		$	1,569

Significant Components of Deferred Tax Assets and Liabilities

The significant component of our deferred tax assets and liabilities were as follows:

	January 31,
	2015			2016
	(in thousands)
Deferred tax assets:
Net operating loss carryforwards	$	101,815		$	137,456
Tax credit carryover		6,136			12,406
Accruals and reserves		729			1,921
Deferred revenue		3,538			20,314
Stock-based compensation expense		4,258			12,588
Depreciation and amortization		2,054			3,397
Charitable contribution carryforwards		—			4,380
Total deferred tax assets		118,530			192,462
Deferred tax liabilities:
Deferred commissions		(5,924	)		(11,000	)
Total deferred tax liabilities		(5,924	)		(11,000	)
Valuation allowance		(112,906	)		(180,926	)
Net deferred tax assets (liabilities), net of valuation    allowance	$	(300	)	$	536

Summary of Activity Related to Unrecognized Tax Benefits

The activity related to the unrecognized tax benefits is as follows:

	Fiscal Year Ended January 31,
	2014			2015		2016
	(in thousands)
Gross unrecognized tax benefits—beginning balance	$	479		$	4,676	$	13,874
Decreases related to tax positions taken during    prior years		(10	)		—		(3,969	)
Increases related to tax positions taken during    prior years		—			—		35
Increases related to tax positions taken during    current year		4,207			9,198		5,530
Gross unrecognized tax benefits—ending balance	$	4,676		$	13,874	$	15,470