Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Apr. 30, 2012
Current assets:
Cash and cash equivalents	$ 23,845	$ 74,367
Restricted cash	604	500
Short-term investments	81,646	50,834
Accounts receivable, net of allowance for doubtful accounts of $1,564 and $788 as of January 31, 2013, and April 30, 2012, respectively	30,310	17,977
Prepaid expenses and other current assets	4,624	3,873
Total current assets	141,029	147,551
Property equipment and capitalized internal-use software development costs, net	13,431	8,868
Goodwill	141,833
Acquired intangible assets, net	53,465
Other non-current assets	190	448
Total assets	349,948	156,867
Current liabilities:
Accounts payable	6,189	2,523
Accrued expenses and other current liabilities	23,289	12,725
Deferred revenue	50,755	42,152
Total current liabilities	80,233	57,400
Deferred revenue less current portion	2,162	3,434
Deferred tax liability, long-term	1,393	31
Other liabilities, long-term	6,836	2,404
Total liabilities	90,624	63,269
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock - $0.0001 par value; 150,000,000 shares authorized, 72,948,155 shares issued and 72,698,155 shares outstanding as of January 31, 2013; 150,000,000 shares authorized, 58,779,937 shares issued and 58,529,937 shares outstanding as of April 30, 2012	7	6
Treasury stock, at cost - 250,000 shares at January 31, 2013 and April 30, 2012
Additional paid-in capital	365,115	158,769
Accumulated other comprehensive loss	(33)	(20)
Accumulated deficit	(105,765)	(65,157)
Total stockholders' equity	259,324	93,598
Total liabilities and stockholders' equity	$ 349,948	$ 156,867