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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
Nov. 06, 2012
Oct. 15, 2012
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Organization And Summary Of Significant Accounting Policies [Line Items]          
Initial public offering of shares   6,000,000      
Shares issued during period, shares sold by certain shareholders   1,095,349      
Initial public offering price per share   $ 6.00      
Proceeds from initial public offering   $ 25.4      
Redeemable convertible preference shares converted to ordinary shares   13,315,727      
Redeemable convertible preference shares conversion   Converted into ordinary shares on a one-to-one basis      
Over-allotment option shares sold 900,000        
Net proceeds from the sale of over-allotment shares $ 5.0        
Estimated useful life     3 years 3 years 3 years
Percentage of license revenue to company's revenue     2.00% 3.00% 2.00%
Expected dividend yield     0.00% 0.00% 0.00%