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Subsequent Events - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Sep. 30, 2012
Jan. 31, 2013
Subsequent Events [Member]
Mar. 29, 2013
Subsequent Events [Member]
Jan. 24, 2013
Subsequent Events [Member]
Subsequent Event [Line Items]            
Note receivable           $ 2,500,000
Common stock value 110,420 110,420 108,354   2,500,000 1,600,000
Shares issued under public offering 1,800,000     1,667,051    
Shares issued under public offering, price per share $ 2.26 $ 2.26   $ 2.12    
Unit sold, description Each unit consisted of one share of Common Stock and a warrant to purchase     Each unit consisted of one share of Common Stock and a warrant to purchase    
Warrant to purchase share of Common Stock 0.5 0.5   0.5    
Exercise price of warrant 2.12 2.12   2.14    
Gross proceeds from offering $ 3,900,000 $ 3,300,000   $ 3,300,000