Income Taxes (Tables)

12 Months Ended

Jan. 31, 2016

Income Tax Disclosure [Abstract]

Summary of Income before Income Taxes

Income before income taxes consisted of the following for the periods indicated:

	Year Ended January 31,
	2016		2015		2014
	(in thousands)
U.S. operations	$	3,190	$	1,978	$	1,990
Non-U.S. operations		82,019		50,058		25,905
Income before income taxes	$	85,209	$	52,036	$	27,895

Schedule of Income Tax Provision

Income tax provision consisted of the following for the periods indicated:

	Year Ended January 31,
	2016			2015			2014
	(in thousands)
Current:
U.S. federal tax	$	5,273		$	3,135		$	1,738
U.S. state taxes		541			93			23
Non-U.S. foreign taxes		1,874			1,348			1,058
		7,688			4,576			2,819
Deferred:
U.S. federal tax		1,050			(3,208	)		(952	)
U.S. state taxes		—			—			341
Non-U.S. foreign taxes		(37	)		97			33
		1,013			(3,111	)		(578	)
Provision for income taxes	$	8,701		$	1,465		$	2,241

Schedule of Income Tax Provision Differed from Amounts Computed by Applying U.S. Federal Income Tax Rate

Income tax provision differed from the amounts computed by applying the U.S. federal income tax rate of 34% to pretax income as a result of the following for the periods indicated:

	Year Ended January 31,
	2016			2015			2014
	(in thousands)
U.S. federal tax at statutory rate	$	28,971		$	17,692		$	9,484
U.S. state taxes		541			90			361
Non-U.S. foreign tax differential		(26,253	)		(15,644	)		(7,674	)
Stock-based compensation		2,896			1,601			927
U.S. R&D credit		(3,517	)		(2,298	)		(858	)
Valuation allowance		6,090			—			—
Other		(27	)		24			1
Provision for income taxes	$	8,701		$	1,465		$	2,241

Schedule of Deferred Tax Assets and Liabilities

Temporary differences that gave rise to significant portions of the Company’s deferred tax assets and liabilities at January 31, 2016 and 2015 were as follows:  

	As of January 31,
	2016			2015
	(in thousands)
Deferred tax assets:
Federal and state credits	$	11,852		$	6,465
Expenses not currently deductible		2,331			1,590
Stock-based compensation		2,503			2,044
Gross deferred tax assets		16,686			10,099
Valuation allowance		(12,072	)		(3,996	)
Total deferred tax assets	$	4,614		$	6,103
Deferred tax liabilities
Property and equipment		(1,378	)		(199	)
Foreign deferred		(33	)		(70	)
Net deferred tax assets	$	3,203		$	5,834

Summary of Tax Valuation Allowance

Tax valuation allowance for the periods indicated below were as follows:

							Deductions
					Additions		Charged to
	Balance at		Additional		Charged to		Expenses		Balance at
	Beginning of		Charged to		Other		or Other		End of
	Period		Expenses		Account		Accounts		Period
	(in thousands)
Tax Valuation Allowance
Year ended January 31, 2016	$	3,996		8,076		—		—	$	12,072
Year ended January 31, 2015	$	2,302		1,694		—		—	$	3,996
Year ended January 31, 2014	$	1,243		1,059		—		—	$	2,302

Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

The following table sets forth a reconciliation of the beginning and ending amount of unrecognized tax benefits:

	Year Ended January 31,
	2016			2015			2014
	(in thousands)
Beginning balance:	$	4,671		$	3,583		$	3,018
Additions based on tax positions related to the    current year		17,169			1,284			539
Additions for tax positions of prior years		8,810			324			62
Reductions for tax positions in prior years		(37	)		—			—
Settlements for prior periods		—			(43	)		—
Lapse of applicable statute of limitations		(402	)		(477	)		(36	)
Ending balance:	$	30,211		$	4,671		$	3,583