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Liquidity - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 23, 2014
May. 17, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]              
Net Income Loss     $ (2,025,510) $ (1,456,766) $ (6,035,490) $ (4,697,931) $ 6,300,000
Accumulated deficit     $ (127,125,802)   $ (127,125,802)   $ (121,090,312)
Venture Loan [Member]              
Line of Credit Facility [Line Items]              
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.1003            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,492,523            
Debt Instrument, Description of Variable Rate Basis The loan bears interest at a floating rate equal to the One Month LIBOR Rate (with a floor of 0.50%) plus 8.50%. In the event that the One Month LIBOR Rate, as reported in the Wall Street Journal, exceeds 0.50%, the interest rate will be adjusted by an amount equal to the difference between such rates at the end of that particular month.            
Debt Instrument, Payment Terms The loan is to be repaid in forty-five (45) monthly payments consisting of fifteen (15) monthly payments of only interest followed by thirty (30) equal monthly payments of principal and interest. In addition, at the end of the repayment term (or at early termination of the loan) a final payment equal to 4.5% of the loan will be due and payable.            
Proceeds from Issuance of Long-term Debt $ 5,000,000            
Debt Instrument, Interest Rate, Stated Percentage 9.00%   9.00%   9.00%    
Warrants Expire Term 10 years            
December 2014 Private Placement [Member]              
Line of Credit Facility [Line Items]              
Sale of Stock, Number of Shares Issued in Transaction 50,099,700            
Sale of Stock, Price Per Share $ 0.1003            
Sale of Stock, Consideration Received on Transaction $ 5,025,000            
2013 Warrants [Member]              
Line of Credit Facility [Line Items]              
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.2745          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   32,786,885          
Debt Instrument, Payment Terms   7 years          
2014 warrants [Member]              
Line of Credit Facility [Line Items]              
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.1003            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 50,099,700            
Debt Instrument, Payment Terms 7 years            
Common Stock [Member]              
Line of Credit Facility [Line Items]              
Net Income Loss         $ 0 $ 0  
Sale of Stock, Consideration Received on Transaction   $ 12,000,000          
Common Stock [Member] | May 2013 Private Placement [Member]              
Line of Credit Facility [Line Items]              
Sale of Stock, Number of Shares Issued in Transaction   43,715,847          
Sale of Stock, Price Per Share   $ 0.2745          
Sale of Stock, Consideration Received on Transaction   $ 12,000,000