Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Revenue	$ 42,678	$ 27,602	$ 116,966	$ 74,705
Cost of revenue	14,217	9,514	40,949	26,116
Gross profit	28,461	18,088	76,017	48,589
Operating expenses:
Sales and marketing	20,710	12,152	53,882	35,469
Research and development	8,914	6,059	24,356	13,978
General and administrative	8,783	5,934	32,463	15,848
Acquisition-related and other	2,021		4,771
Amortization of acquired intangible assets	1,165		2,543
Total operating expenses	41,593	24,145	118,015	65,295
Operating loss	(13,132)	(6,057)	(41,998)	(16,706)
Other income (expense), net
Interest income	61	4	110	17
Other income (expense)	(49)	(341)	(451)	(805)
Total other income (expense), net	12	(337)	(341)	(788)
Loss before income taxes	(13,120)	(6,394)	(42,339)	(17,494)
Income tax expense (benefit)	(2,293)	181	(1,731)	468
Net loss	(10,827)	(6,575)	(40,608)	(17,962)
Accretion of redeemable convertible preferred stock		(10)		(35)
Net loss applicable to common stockholders	$ (10,827)	$ (6,585)	$ (40,608)	$ (17,997)
Net loss per share applicable to common stockholders:
Basic and diluted	$ (0.15)	$ (0.34)	$ (0.60)	$ (0.93)
Basic and diluted weighted average number of shares outstanding	71,940	19,613	68,115	19,284