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Consolidated Statements of Operations (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Income Statement [Abstract]        
Revenues $ 72,618 $ 36,450 $ 192,138 $ 91,269
Costs and expenses(1):        
Costs of revenues 30,194 17,679 83,549 45,038
Research and development 28,075 16,404 72,413 43,727
Sales and marketing 32,584 18,215 87,051 47,774
General and administrative 22,633 3,594 36,310 10,083
Total costs and expenses 113,486 55,892 279,323 146,622
Operating loss (40,868) (19,442) (87,185) (55,353)
Other expense, net (364) (243) (1,036) (574)
Loss before provision for income taxes (41,232) (19,685) (88,221) (55,927)
Provision for income taxes 78 46 25 116
Net loss (41,310) (19,731) (88,246) (56,043)
Accretion of redeemable convertible preferred stock (161) (72) (568) (85)
Net loss attributable to Class A and Class B common stockholders (41,471) (19,803) (88,814) (56,128)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted $ (0.67) $ (0.66) $ (2.06) $ (1.93)
Weighted-average shares used to compute net loss per share attributable to Class A and Class B common stockholders 61,960 29,779 43,053 29,013
(1) Costs and expenses include share-based compensation as follows:        
Costs of revenues 609 182 1,101 416
Research and development 1,300 306 2,227 751
Sales and marketing 970 233 1,838 533
General and administrative $ 3,273 $ 389 $ 4,714 $ 1,056