Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Revenue	$ 49,562	$ 43,600	$ 142,864	$ 125,067
Cost of revenue	17,988	13,758	51,758	38,383
Gross profit	31,574	29,842	91,106	86,684
Operating expenses:
Sales and marketing	18,020	20,765	57,946	62,598
Research and development	8,779	9,036	27,815	27,753
General and administrative	6,932	7,674	22,925	19,849
Acquisition-related and other	413	31	3,231	15,818
Amortization of acquired intangible assets	309	282	928	847
Total operating expenses	34,453	37,788	112,845	126,865
Operating loss	(2,879)	(7,946)	(21,739)	(40,181)
Other income (expense), net:
Interest income	27	24	43	136
Interest expense	(536)		(1,018)	(32)
Other expense	(411)	(292)	(1,031)	(618)
Total other expense, net	(920)	(268)	(2,006)	(514)
Loss from continuing operations before income taxes	(3,799)	(8,214)	(23,745)	(40,695)
Income tax expense (benefit)	324	179	594	(82)
Net loss from continuing operations	(4,123)	(8,393)	(24,339)	(40,613)
Income (loss) from discontinued operations, net of tax		430	(1,257)	1,128
Net loss applicable to common stockholders	$ (4,123)	$ (7,963)	$ (25,596)	$ (39,485)
Net loss per share applicable to common stockholders:
Continuing operations	$ (0.05)	$ (0.11)	$ (0.31)	$ (0.54)
Discontinued operations		$ 0.01	$ (0.02)	$ 0.02
Basic and diluted loss per share:	$ (0.05)	$ (0.10)	$ (0.33)	$ (0.52)	[1]
Basic and diluted weighted average number of shares outstanding	78,898	76,071	78,315	75,047

[1] The sum of the earnings per share amounts for continuing and discontinued operations does not equal the total earnings per share amount for the year as previously reported due to the effects of rounding.