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Organization and Basis of Presentation - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 116 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Jan. 31, 2013
Subsequent Events [Member]
Sep. 30, 2011
Wisepower [Member]
Schedule of Investments [Line Items]                
Cash for fund operations $ 2,931,032 $ 2,931,032 $ 6,773,126 $ 2,931,032 $ 3,377,288 $ 7,507,389    
Cash position decreased during year   (446,256) (734,263) 2,931,032        
Cash from issuance of equity 3,900,000 3,300,000         3,300,000  
Proceeds from revenue   300,000            
Cash outflow from continuing operations   (3,837,586) (2,705,356) (79,715,382)        
Drawing Limit under Equity Line Facility               15,000,000
Minimum stock price required to maintain under equity line facility $ 2.00 $ 2.00   $ 2.00        
Proceeds from equity line facility   1,000,000            
Shares issued under public offering 1,800,000           1,667,051  
Shares issued under public offering, price per share $ 2.26 $ 2.26   $ 2.26     $ 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     0.5  
Exercise price of warrant 2.12 2.12   2.12     2.14  
Promissory note 500,000 500,000   500,000        
Promissory note, maturity date Feb. 01, 2013 Nov. 26, 2013            
Accumulated deficit $ (139,611,839) $ (139,611,839)   $ (139,611,839) $ (134,997,680)