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Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended	1 Months Ended
	Sep. 30, 2012	Dec. 31, 2012 Subsequent Events [Member]
Shares issued under public offering		1,900,000
Shares issued under public offering, price per share		$ 2.26
Warrant to purchase share of Common Stock		0.5
Exercise price of warrant		2.20
Gross proceeds from offering	$ 11,000,000	$ 4,300,000
Promissory note		500,000
Promissory note, maturity date	Nov. 26, 2013	Feb. 01, 2013
Commissions and other offering expenses		$ 300,000

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