Stockholders' Equity - Schedule of Stockholders' Equity (Parenthetical) (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013
Class of Stock [Line Items]
Preferred stock, par value	$ 0.00001	$ 0.00001
Common stock, par value	$ 0.00001	$ 0.00001
Series A convertible preferred stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	$ 0.00001	$ 0.00001
Series B convertible preferred stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	$ 0.00001	$ 0.00001
Class A common stock [Member]
Class of Stock [Line Items]
Common stock, par value	$ 0.00001	$ 0.00001
Class B common stock [Member]
Class of Stock [Line Items]
Common stock, par value	$ 0.00001	$ 0.00001