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Stockholders' Deficit - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Incentive_Plan
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2012
Warrants [Member]
Investor
Mar. 31, 2013
Common Stock [Member]
Sep. 30, 2012
Common Stock [Member]
Sep. 30, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Jun. 03, 2010
Common Stock [Member]
Jan. 16, 2008
Common Stock [Member]
Aug. 17, 2007
Common Stock [Member]
Sep. 30, 2012
Common Stock [Member]
Warrants [Member]
Sep. 30, 2012
Common Stock [Member]
Employee Stock Incentive Plan [Member]
Aug. 17, 2007
Common Stock [Member]
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2012
Series G Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Common stock, shares issued 81,484,779   81,484,779   75,416,203     140,000 3,174,893 1,441,013              
Common stock, shares value representing payment for principal $ 8,148   $ 8,148   $ 7,542       $ 8,316,047 $ 4,262,527              
Common shares issued from warrant conversion             2,010,500 287,500                  
Number of accredited investors to whom common stock stock issued           4                      
Number of warrants exercised in exchange for common stock shares                           287,500      
Common stock shares issued employee stock incentive plan                             8,900    
Number of series G preferred stock converted                                 1
Number of stock incentive plans     2                            
Stock incentive plan expiration date         Aug. 17, 2007                        
Shares authorized for stock-based compensation                     3,000,000 2,500,000 2,500,000     500,000  
Exercise price of incentive option granted                   Exercise price of any incentive option granted to an eligible employee owning more than 10% of our outstanding common stock must not be less than 110% of fair market value on the date of the grant.              
Eligible employee threshold percentage                 10.00%                
Purchase price of common stock percentage                 110.00%                
Share-based compensation $ 882,933 $ 380,143 $ 2,123,706 $ 1,298,231                          
Weighted average estimated fair value of stock options $ 1.24 $ 2.09 $ 1.24 $ 2.09