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Incentive Stock Rights - Additional Information (Detail) (USD $)
3 Months Ended
Apr. 30, 2014
Jul. 31, 2013
Jan. 31, 2012
Jul. 31, 2010
Jun. 24, 2010
Disclosure Incentive Stock Rights Additional Information [Abstract]          
Dividend distribution of rights declared for each outstanding share of common stock         1
Number of shares called by rights         0.0001
Incentive stock purchase right adoption date       Jun. 24, 2010  
Incentive stock rights dividend date of record       Jul. 06, 2010  
Incentive stock purchase right amendment date   Jun. 28, 2013 Dec. 23, 2011    
Class of warrant or right issuable with each new share of common stock 1        
Incentive stock purchase price $ 90        
Percentage of common stock acquired to initiate exercise of incentive stock rights, minimum 15.00%        
Percentage of common stock acquired to initiate exercise of incentive stock rights, certain investors 20.00%        
Percent of incentive stock right exercise price for value of the entity's common stock received upon exercise of incentive stock right 200.00%        
Date on which rights expire Jun. 30, 2015        
Rights redemption price $ 0.001