Income Taxes (Tables)

12 Months Ended

Jan. 31, 2017

Income Tax Disclosure [Abstract]

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

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

	Year Ended January 31,
	2015			2016			2017
Domestic	$	(186,922	)	$	(195,019	)	$	(200,355	)
International	5,028			(17,164		)	(42,824		)
Total	$	(181,894	)	$	(212,183	)	$	(243,179	)

Schedule of Components of Provision for Income Taxes

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

	Year Ended January 31,
	2015		2016			2017
Current:
State	$	56	$	210		$	389
Foreign	1,073		2,198			1,806
Total	$	1,129	$	2,408		$	2,195
Deferred:
Foreign	208		(839		)	(308		)
Provision for income taxes	$	1,337	$	1,569		$	1,887

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 (in thousands):

	Year Ended January 31,
	2015			2016			2017
Tax at federal statutory rate	$	(61,844	)	$	(72,142	)	$	(82,682	)
State tax, net of federal benefit	44			152			276
Stock-based compensation expense	5,328			10,866			(5,242		)
Research and development tax credits	(1,999		)	(3,832		)	(1,570		)
Foreign rate differential	(429		)	7,106			15,878
Change in valuation allowance	60,042			58,979			73,863
Other	195			440			1,364
Provision for income taxes	$	1,337		$	1,569		$	1,887

Significant Components of Deferred Tax Assets and Liabilities

The significant component of our deferred tax assets and liabilities were as follows (in thousands):

	January 31,
	2016			2017
Deferred tax assets:
Net operating loss carryforwards	$	137,456		$	173,942
Tax credit carryover	12,406			15,319
Accruals and reserves	1,921			3,112
Deferred revenue	20,314			53,424
Stock-based compensation expense	12,588			26,401
Depreciation and amortization	3,397			7,302
Charitable contribution carryforwards	4,380			4,345
Total deferred tax assets	192,462			283,845
Valuation allowance	(180,926		)	(271,779		)
Total deferred tax assets, net of valuation allowance	11,536			12,066
Deferred tax liabilities:
Deferred commissions	(11,000		)	(11,222		)
Total deferred tax liabilities	(11,000		)	(11,222		)
Net deferred tax assets	$	536		$	844

Summary of Activity Related to Unrecognized Tax Benefits

The activity related to the unrecognized tax benefits is as follows (in thousands):

	Year Ended January 31,
	2015		2016			2017
Gross unrecognized tax benefits—beginning balance	$	4,676	$	13,874		$	15,470
Decreases related to tax positions taken during    prior years	—		(3,969		)	(11,286		)
Increases related to tax positions taken during    prior years	—		35			—
Increases related to tax positions taken during    current year	9,198		5,530			2,191
Gross unrecognized tax benefits—ending balance	$	13,874	$	15,470		$	6,375