Incentive Stock Rights - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Jul. 31, 2010	Oct. 31, 2012	Dec. 23, 2011	Jun. 24, 2010
Disclosure Incentive Stock Rights Additional Information [Abstract]
Incentive Stock Purchase Right Adoption Date				Jun. 24, 2010
Dividend distribution of rights declared for each outstanding share of common stock				1
Record date for distribution of rights	Jul. 06, 2010
Incentive Stock Purchase Right Amendment Date			Dec. 23, 2011
Right issuable with each new share of common stock				1
Number of shares called by rights				0.0001
Incentive Stock purchase price			$ 65
Percentage of common stock acquired to initiate exercise of incentive stock rights, minimum		15.00%
Percent of incentive stock right exercise price for value of the entity's common stock received upon exercise of incentive stock right		200.00%
Percent of incentive stock right exercise price for value of acquiring company's common stock received upon exercise of incentive stock right		200.00%
Date on which rights expire		Jun. 30, 2013
Rights redemption price				$ 0.001
Description of the stock purchase rights plan		As long as the Rights are attached to our common stock, we will issue one Right with each new share of common stock so that all such shares will have attached Rights. Under certain conditions, each Right may be exercised to purchase 1/10,000 of a share of Series B Junior Participating Incentive Stock at a purchase price of sixty-five dollars, subject to adjustment. The Rights are not presently exercisable and will only become exercisable if a person or group acquires or commences a tender offer to acquire 15% or more of our common stock. If a person or group acquires 15% or more of the common stock, each Right will be adjusted to entitle its holder to receive, upon exercise, common stock (or, in certain circumstances, other assets of ours) having a value equal to two times the exercise price of the Right, or each Right will be adjusted to entitle its holder to receive, upon exercise, common stock of the acquiring company having a value equal to two times the exercise price of the Right, depending on the circumstances. The Rights expire on June 30, 2013 and may be redeemed by us for $0.001 per Right.