CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jan. 31, 2013	Jan. 31, 2012
CONSOLIDATED BALANCE SHEETS
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	0	57,904,560
Convertible preferred stock, shares issued	0	56,930,194
Convertible preferred stock, shares outstanding	0	56,930,194
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	106,511,960
Common stock, shares issued	100,920,350	23,092,407
Common stock, shares outstanding	100,920,350	23,092,407