Authorized Number of Shares of Common Stock - Additional Information (Detail) (USD $)	1 Months Ended
	Mar. 10, 2011	Apr. 17, 1987	Oct. 31, 2012	Oct. 31, 2011	Nov. 04, 2011 Before Amendment	Oct. 31, 2011 Before Amendment	Nov. 04, 2011 After Amendment	Apr. 17, 1987 Restated
Capital Unit [Line Items]
Common stock, authorized		100,000,000	20,000,000	20,000,000	200,000,000	200,000,000	20,000,000	10,000,000
Common stock, par value		$ 0.001	$ 0.01	$ 0.01				$ 0.01
Common stock, shares outstanding		29,999,998	6,978,374	7,110,507
Stock split ratio	2	0.1
Reduction in number of outstanding shares		3,000,000