Convertible Preferred Stock - Additional Information (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jul. 03, 2012	Jul. 03, 2012 Convertible Preferred Stock [Member]	Jan. 31, 2012 Convertible Preferred Stock [Member]
Convertible Preferred Stock [Line Items]
Convertible preferred stock, shares authorized	5,000,000	5,000,000		5,000,000	77,835,000
Convertible preferred stock par value	$ 0.001	$ 0.001		$ 0.001	$ 0.001
Preferred stock converted into common stock			8,529,366