Capital Stock - Additional Information (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
Equity [Abstract]
Preference shares, shares authorized	20,000,000	20,000,000
Preference shares, par value	$ 0.00045	$ 0.00045
Preference shares, shares issued	0	0
Preference shares, shares outstanding	0	0
Company issued warrants to purchase redeemable convertible preference shares, exercise price		3.582
Company issued warrants to purchase redeemable convertible preference shares		36,292
Total ordinary share warrants outstanding	0	36,292
Total ordinary shares authorized	200,000,000	200,000,000