Income Taxes (Tables)

12 Months Ended

Jan. 31, 2019

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,
	2019			2018		2017
	(in thousands)
U.S. operations	$	1,381		$	2,683	$	3,092
Non-U.S. operations		(35,933	)		23,046		57,789
Income (loss) before income taxes	$	(34,552	)	$	25,729	$	60,881

Schedule of Income Tax Provision (Benefit)

Income tax provision (benefit) consisted of the following for the periods indicated:

	Year Ended January 31,
	2019			2018			2017
	(in thousands)
Current:
U.S. federal tax	$	1,290		$	3,321		$	818
U.S. state taxes		2			4			(212	)
Non-U.S. foreign taxes		1,561			1,435			1,454
		2,853			4,760			2,060
Deferred:
U.S. federal tax		(7,077	)		2,185			1,174
U.S. state taxes		—			—			—
Non-U.S. foreign taxes		119			(68	)		(163	)
		(6,958	)		2,117			1,011
Provision (benefit) for income taxes	$	(4,105	)	$	6,877		$	3,071

Schedule of Reconciliation Between the Provision (Benefit) for Income Taxes at the Statutory Rate and the Effective Tax Rate

For purposes of the reconciliation between the provision (benefit) for income taxes at the statutory rate and the effective tax rate, a notional U.S. 21.0%, 33.8% and 34.0% rates are applied to pretax income (loss) as a result of the following for the periods indicated, respectively:

	Year Ended January 31,
	2019			2018			2017
	(in thousands)
Provision at U.S. notional statutory rate	$	(7,256	)	$	8,699		$	20,700
U.S. state taxes		2			2			(216	)
Non-U.S. foreign tax differential		9,226			(6,424	)		(18,357	)
Stock-based compensation		4,715			4,645			1,605
U.S. R&D credit		(2,770	)		(2,408	)		(2,226	)
Valuation allowance		(7,990	)		(1	)		1,901
Change in tax rate		—			2,252			—
Other		(32	)		112			(336	)
Provision (benefit) for income taxes	$	(4,105	)	$	6,877		$	3,071

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, 2019 and 2018 were as follows:  

	As of January 31,
	2019			2018
	(in thousands)
Deferred tax assets:
Federal and state credits	$	19,426		$	18,176
Expenses not currently deductible		575			1,213
Stock-based compensation		3,202			2,899
Foreign deferred		122			229
Gross deferred tax assets		23,325			22,517
Valuation allowance		(12,526	)		(18,538	)
Total deferred tax assets	$	10,799		$	3,979
Deferred tax liabilities
Property and equipment		(1,505	)		(1,655	)
Net deferred tax assets	$	9,294		$	2,324

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, 2019	$	18,538		1,978		—		(7,990	)	$	12,526
Year ended January 31, 2018	$	15,061		3,477		—		—		$	18,538
Year ended January 31, 2017	$	12,072		2,989		—		—		$	15,061

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,
	2019			2018			2017
	(in thousands)
Beginning balance:	$	34,117		$	37,977		$	30,211
Additions based on tax positions related to the    current year		3,922			7,892			7,830
Additions for tax positions of prior years		109			28			911
Reductions for tax positions in prior years		(552	)		(11,313	)		—
Settlements for prior periods		—			—			—
Lapse of applicable statute of limitations		(65	)		(467	)		(975	)
Ending balance:	$	37,531		$	34,117		$	37,977