Income Taxes (Tables)

12 Months Ended

Apr. 30, 2017

Income Tax Disclosure [Abstract]

Components of Loss Before Income Tax

U.S. and international components of loss before income taxes were as follows (in thousands):

	Year Ended April 30,
	2017			2016			2015
U.S.	$	(17,072	)	$	(27,239	)	$	(35,174	)
International	1,684			1,938			2,064
Loss from operations before income taxes	$	(15,388	)	$	(25,301	)	$	(33,110	)

Income Tax Expense (Benefit)

Income tax expense is composed of the following (in thousands):

	Year Ended April 30,
	2017			2016			2015
Current:
Federal	$	—		$	—		$	(38	)
State	39			(77		)	182
International	619			556			951
Total	658			479			1,095
Deferred:
Federal	(4,363		)	(6,635		)	(12,491		)
State	(386		)	(1,070		)	(2,308		)
International	(108		)	(94		)	44
Total	(4,857		)	(7,799		)	(14,755		)
Change in valuation allowance	4,752			7,358			13,714
Provision for income taxes	$	553		$	38		$	54

Schedule of Effective Income Tax Rate Reconciliation

The difference between the tax expense derived by applying the Federal statutory income tax rate to net losses and the expense recognized in the financial statements is as follows (in thousands):

	Year Ended April 30,
	2017			2016			2015
U.S. federal taxes at statutory rate	$	(5,232	)	$	(8,603	)	$	(11,257	)
State tax provision	(256		)	(625		)	(923		)
Foreign tax rate differentials	(95		)	(108		)	(206		)
Research and development credit	(912		)	(1,473		)	(1,972		)
Stock options	2,348			3,480			506
Nondeductible legal expenses	—			—			200
Permanent differences and other	167			—			(8		)
Return to provision adjustments	(219		)	9			—
Change in valuation allowance	4,752			7,358			13,714
Provision for (benefit from) income taxes	$	553		$	38		$	54

Schedule of Deferred Tax Assets and Liabilities

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

	Year Ended April 30,
	2017			2016
Deferred tax asset:
Bad debts	$	466		$	872
Other accruals	2,363			1,138
Charitable contributions	436			509
Stock options	7,300			5,832
State tax credit	2,633			2,347
Net operating losses	66,431			64,998
Research and development credit	6,869			6,290
Deferred rent	2,333			2,513
Deferred revenue	810			1,969
Foreign tax credit	128			128
Total deferred tax asset	89,769			86,596
Less valuation allowance	(78,558		)	(73,806		)
Net deferred tax assets	11,211			12,790
Deferred tax liability:
Amortization of intangible assets	(2,854		)	(3,564		)
Depreciation	(6,628		)	(7,476		)
Total deferred tax liability	(9,482		)	(11,040		)
Total net deferred tax assets	$	1,729		$	1,750

Schedule of Unrecognized Tax Benefits Roll Forward

The aggregate changes in the balance of unrecognized tax benefits were as follows (in thousands):

	Year Ended April 30,
	2017			2016			2015
Unrecognized tax benefits as of May 1,	$	4,193		$	3,619		$	2,157
Tax positions taken in prior periods:
Gross increases	—			88			883
Gross decreases	(199		)	(42		)	—
Tax positions taken in current period:
Gross increases	595			528			579
Lapse of statute of limitations	(68		)	—			—
Balance as of April 30,	$	4,521		$	4,193		$	3,619