Income Taxes (Tables)

12 Months Ended

Jan. 31, 2018

Income Tax Disclosure [Abstract]

Reconciliation of Income Tax Expense

Income tax expense differed from the amount computed by applying the federal blended statutory income tax rate of 32.9% to pretax loss as a result of the following (in thousands):

	Fiscal Year Ended January 31,
	2018			Rate			2017			Rate			2016			Rate
Federal tax at statutory rate	$	(4,316	)		33	%	$	(4,403	)		34	%	$	(4,787	)		34	%
Impact of U.S. tax law change		11,667			(89	)%		—			—			—			—
Change in valuation allowance		(6,786	)		52	%		4,881			(38	)%		4,502			(32	)%
Research and development credit		(1,080	)		8	%		(738	)		6	%		(273	)		2	%
State taxes		(396	)		3	%		(230	)		2	%		(261	)		2	%
Stock-based compensation		387			(3	)%		387			(3	)%		691			(5	)%
Permanent tax adjustment		527			(4	)%		103			(1	)%		128			(1	)%
Total	$	3			0	%	$	—			0	%	$	—			0	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities related to the following (in thousands):

	As of January 31,
	2018			2017
Deferred tax assets:
Accruals and reserves	$	2,281		$	2,623
Stock-based compensation		1,030			1,887
Intangible assets amortization		61			101
Deferred revenue		125			182
Net operating loss carry forwards		22,047			28,120
Tax credit carryover		3,810			2,296
Gross deferred tax assets		29,354			35,209
Valuation allowance		(28,657	)		(34,900	)
Net deferred tax assets	$	697		$	309
Deferred tax liabilities:
Acquired intangible assets	$	(313	)	$	(183	)
Fixed assets depreciation		(384	)		(126	)
Gross deferred tax liabilities	$	(697	)	$	(309	)
Total deferred tax assets	$	—		$	—

Summary of Activity Related to UTBs

The following table summarizes the activity related to UTBs (in thousands):

Balance at January 31, 2016	$	1,217
Increase related to prior year positions		—
Increase related to current year tax positions		598
Balance at January 31, 2017		1,815
Increase related to prior year positions		139
Increase related to current year tax positions		871
Balance at January 31, 2018	$	2,825