Incentive Stock Rights - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 30, 2015	Jul. 31, 2013	Jan. 31, 2012	Jul. 31, 2010	Jun. 24, 2010
Disclosure Incentive Stock Rights Additional Information [Abstract]
Number of shares called by rights					0.0001
Incentive stock purchase right adoption date				Jun. 24, 2010
Common Stock Dividends Right Declared					1
Incentive stock rights dividend date of record				Jul. 06, 2010
Incentive stock purchase right amendment date		Jun. 28, 2013	Dec. 23, 2011
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