Income Taxes (Tables)

12 Months Ended

Apr. 30, 2015

Income Tax Disclosure [Abstract]

Components of Loss Before Income Taxes

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

	Year Ended April 30,
	2015			2014			2013
U.S.	$	(35,174	)	$	(55,508	)	$	(50,538	)
International		2,064			2,162			1,863
Loss from continuing operations before income taxes	$	(33,110	)	$	(53,346	)	$	(48,675	)

Income Tax Expense (Benefit)

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

	Year Ended April 30,
	2015			2014			2013
Current:
Federal	$	(38	)	$	—		$	—
State		182			294			931
International		951			567			518
Total		1,095			861			1,449
Deferred:
Federal		(12,491	)		(13,930	)		(11,190	)
State		(2,308	)		(2,091	)		9
International		44			203			(90	)
Total		(14,755	)		(15,818	)		(11,271	)
Change in valuation allowance		13,714			14,457			8,650
Provision for (benefit from) income taxes	$	54		$	(500	)	$	(1,172	)

Summary of Difference Between Tax Benefit Derived by Applying Federal Statutory Income Tax Rate to Net Losses and Expense Recognized In Financial Statements

The difference between the tax expense (benefit) 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,
	2015			2014			2013
U.S. federal taxes at statutory rate	$	(11,257	)	$	(18,138	)	$	(16,550	)
State tax provision		(923	)		(1,510	)		250
Foreign tax rate differentials		(206	)		(123	)		(185	)
Research and development credit		(1,972	)		(1,201	)		(1,198	)
Stock options		506			1,608			3,752
Nondeductible legal expenses		200			5,796			3,956
Permanent differences and other		(8	)		(1,389	)		153
Change in valuation allowance		13,714			14,457			8,650
Provision for (benefit from) income taxes	$	54		$	(500	)	$	(1,172	)

Components of Net Deferred Tax Amounts

The components of the net deferred tax amounts recognized in the accompanying consolidated balance sheets are (in thousands):

	Year Ended April 30,
	2015			2014
Deferred tax asset:
Bad debts	$	1,493		$	743
Other accruals		1,317			2,165
Charitable contributions		352			274
Stock options		5,412			4,829
State tax credit		496			554
Net operating losses		58,822			58,536
Research and development credit		6,485			3,497
Deferred rent		273			671
Deferred revenue		1,816			1,175
Total deferred tax asset		76,466			72,444
Less valuation allowance		(66,448	)		(52,734	)
Net deferred tax assets		10,018			19,710
Deferred tax liability:
Amortization of intangible assets		(4,300	)		(15,190	)
Depreciation		(4,374	)		(4,517	)
Total deferred tax liability		(8,674	)		(19,707	)
Total net deferred tax assets	$	1,344		$	3

Aggregate Changes in Balance of Unrecognized Tax Benefits

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

	Year Ended April 30,
	2015		2014			2013
Unrecognized tax benefits as of May 1,	$	2,157	$	1,729		$	539
Tax positions taken in prior periods:
Gross increases		883		—			862
Gross decreases		—		(14	)		—
Tax positions taken in current period:
Gross increases		579		442			330
Gross decreases		—		—			—
Lapse of statute of limitations		—		—			(2	)
Balance as of April 30,	$	3,619	$	2,157		$	1,729