Incentive Stock Rights - Additional Information (Detail) (USD $)	3 Months Ended			6 Months Ended
	Jul. 31, 2013	Jan. 31, 2012	Jul. 31, 2010	Jul. 31, 2014	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
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