Provision for Income Taxes (Tables)

12 Months Ended

Apr. 30, 2017

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

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

	Year Ended April 30, 2017
	Federal			State		Foreign		Total
Current	$	(14	)	$	—	$	33	$	19
Total	$	(14	)	$	—	$	33	$	19

	Year Ended April 30, 2016
	Federal		State		Foreign		Total
Current	$	—	$	—	$	92	$	92
Total	$	—	$	—	$	92	$	92

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation between the Company’s effective tax rate and the United States statutory tax rate for the years ended April 30, 2017 and 2016 is as follows:

	Year Ended April 30,
	2017		2016
Federal income tax at statutory rate	34.0	%	34.0	%
State income tax, net of federal benefit	3.9		3.1
Permanent differences	(0.2	)	(0.2	)
Increase in uncertain tax position	1.6		(0.6	)
Other	(0.3	)	(2.2	)
Change in valuation allowance	(39.8	)	(37.2	)
Changes in tax rates	0.5		2.2
Income tax expense	(0.3	)%	(0.9	)%

Schedule of Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities as of April 30, 2017 and 2016 consist of the following (in thousands):

	As of April 30,
	2017			2016
Accrued liabilities	$	103		$	21
State taxes	22			12
Stock-based compensation expense	6,503			5,528
Capitalized research and development costs	195			316
Foreign net operating loss carry-forward	214			224
Net operating loss carry-forward	14,786			12,970
Total deferred tax assets	21,823			19,071
Less: Valuation allowance	(21,779		)	(19,071		)
Net deferred tax asset	$	44		$	—

Schedule of Unrecognized Tax Benefits Roll Forward

The following table indicates the changes to the Company’s uncertain tax positions for the period and years ended April 30, 2017 and 2016 in thousands:

	Year Ended April 30,
	2017			2016
Balance, beginning of the year	$	165		$	100
Addition based on tax positions related to prior years	—			42
Payment made on tax positions related to prior years	(84		)	—
Addition based on tax positions related to current year	40			23
Balance, end of year	$	121		$	165