Income Taxes (Tables)

12 Months Ended

Jan. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Provision for Income (Loss) Before Income Taxes

The provision for income taxes is based upon the income (loss) before income taxes as follows (in thousands):

	Year Ended January 31,
	2017			2018
Domestic	$	(106,856	)	$	(158,664	)
Foreign		1,520			1,483
Total loss before provision for income taxes	$	(105,336	)	$	(157,181	)

Schedule of Provision for Income Taxes

The provision for income taxes consisted of the following (in thousands):

	Year Ended January 31,
	2017			2018
Current:
Federal	$	—		$	—
State		12			16
Foreign		443			425
Total current tax provision		455			441
Deferred:
Federal		(8	)		—
State	—				—
Foreign		18			37
Total deferred tax provision		10			37
Provision for income taxes	$	465		$	478

Schedule of Provision for Income Taxes Differs from Federal Statutory Income Tax Rate to Income Before Taxes

The provision for income taxes differs from the amount computed by applying the federal statutory income tax rate to income before taxes as follows (in thousands):

	Year Ended January 31,
	2017			2018
U.S. federal taxes at statutory tax rate	$	(35,816	)	$	(53,143	)
State taxes, net of federal benefit		8			11
Nondeductible expenses		281			978
Nondeductible stock-based compensation		2,894			4,453
Foreign rate differential		(59	)		(54	)
Remeasurement of deferred tax assets and liabilities		—			59,160
Other		(618	)		(1,859	)
Change in valuation allowance		33,775			(9,068	)
Provision for income taxes	$	465		$	478

Summary of Components for Deferred Income Tax Asset and Liabilities

The components of deferred income tax assets and liabilities are as follows (in thousands):

	Year Ended January 31,
	2017			2018
Deferred tax assets:
Net operating losses	$	93,497		$	82,375
Depreciation and amortization		2,527			1,877
Accruals and reserves		14,565			12,295
Stock-based compensation		3,715			11,480
Tax credits		4,592			8,202
Other		5			3
Gross deferred tax assets		118,901			116,232
Valuation allowance		(118,827	)		(116,195	)
Net deferred tax assets after valuation allowance		74			37
Deferred tax liabilities		—			—
Total net deferred tax assets	$	74		$	37

Summary of Net Operating Loss and Tax Credit Carryforwards

As of January 31, 2018, the Company had net operating loss carryforwards and tax credit carryforwards as follows (in thousands):

	Amount		Expiration year
Net operating losses, federal	$	348,210	2028-2038
Net operating losses, California		50,706	2028-2038
Net operating losses, other states		103,064	Various
Tax credits, federal		7,778	2030-2038
Tax credits, state	$	7,431	Indefinite

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,
	2017		2018
Gross unrecognized tax benefits—beginning balance	$	2,511	$	3,598
Increase related to tax positions taken during current year		1,087		1,386
Increase related to tax positions taken during prior years	—			1,084
Gross unrecognized tax benefits—ending balance	$	3,598	$	6,068