Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Income Statement [Abstract]
Revenue	$ 48,876	$ 45,977
Cost of revenue	19,548	16,356
Gross profit	29,328	29,621
Operating expenses:
Sales and marketing	19,166	20,995
Research and development	10,533	9,730
General and administrative	8,238	7,893
Acquisition-related and other	702	492
Amortization of acquired intangible assets	309	309
Total operating expenses	38,948	39,419
Operating loss	(9,620)	(9,798)
Other income (expense), net:
Interest income	77	6
Interest expense	(571)	(232)
Other expense	(218)	(272)
Total other expense, net	(712)	(498)
Loss from continuing operations before income taxes	(10,332)	(10,296)
Income tax expense (benefit)	(88)	12
Net loss from continuing operations	(10,244)	(10,308)
Loss from discontinued operations, net of tax	0	(1,257)
Net loss applicable to common stockholders	$ (10,244)	$ (11,565)
Net loss per share applicable to common stockholders:
Continuing operations	$ (0.13)	$ (0.13)
Discontinued operations	0.00	(0.02)
Basic and diluted loss per share:	$ (0.13)	$ (0.15)
Basic and diluted weighted average number of shares outstanding	80,174	77,766