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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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