Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013
Current assets:
Cash and cash equivalents	$ 28,692	$ 25,045
Restricted cash	604	604
Short-term investments	28,195	70,290
Accounts receivable, net of allowance for doubtful accounts of $3,034 and $2,668 as of January 31, 2014 and April 30, 2013, respectively	43,630	29,261
Prepaid expenses and other current assets	7,039	6,632
Total current assets	108,160	131,832
Property, equipment and capitalized internal-use software development costs, net	17,273	14,593
Goodwill	141,833	141,833
Acquired intangible assets, net	46,689	51,924
Other non-current assets	3,279	1,761
Total assets	317,234	341,943
Current liabilities:
Accounts payable	7,131	6,637
Accrued expenses and other current liabilities	27,366	32,390
Deferred revenue	53,614	54,854
Total current liabilities	88,111	93,881
Deferred revenue less current portion	2,104	2,049
Deferred tax liability, long-term	2,028	2,032
Other liabilities, long-term	1,678	2,632
Total liabilities	93,921	100,594
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock - $0.0001 par value; 150,000,000 shares authorized, 77,106,633 shares issued and 76,856,633 shares outstanding as of January 31, 2014; 150,000,000 shares authorized, 73,925,136 shares issued and 73,675,136 shares outstanding at April 30, 2013	8	7
Treasury stock, at cost - 250,000 shares at January 31, 2014 and April 30, 2013
Additional paid-in capital	391,486	370,397
Accumulated other comprehensive income (loss)	213	(146)
Accumulated deficit	(168,394)	(128,909)
Total stockholders' equity	223,313	241,349
Total liabilities and stockholders' equity	$ 317,234	$ 341,943