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Stockholders' Equity/(Deficit) - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Incentive_Plan
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Warrants [Member]
Investor
Dec. 31, 2013
Unvested Restricted Stock Awards Excluded from EPS [Member]
Dec. 31, 2012
Unvested Restricted Stock Awards Excluded from EPS [Member]
Dec. 31, 2011
Unvested Restricted Stock Awards Excluded from EPS [Member]
Dec. 31, 2013
Common Stock [Member]
Mar. 31, 2013
Common Stock [Member]
Sep. 30, 2012
Common Stock [Member]
Dec. 31, 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]
Dec. 31, 2013
Common Stock [Member]
Minimum [Member]
Dec. 31, 2013
Common Stock [Member]
Warrants [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]
Dec. 31, 2013
Series G Convertible Preferred Stock [Member]
Warrants [Member]
Investor
Dec. 31, 2013
Series D Convertible, Preferred Stock [Member]
Dec. 31, 2012
Series D Convertible, Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                
Common stock, shares issued 83,882,577 75,416,203           3,552,357   140,000 3,552,357 1,441,013                        
Common stock, shares value representing payment for principal $ 8,388 $ 7,542           $ 9,279,887     $ 9,279,887 $ 4,262,528                        
Common shares issued from warrant conversion               1,725,000 2,010,500 287,500                            
Number of accredited investors to whom common stock stock issued       4                                   5    
Number of warrants exercised in exchange for common stock shares 2,087,500                               1,725,000 287,500            
Common stock shares issued employee stock incentive plan                                     8,900          
Number of series G preferred stock converted                                         1      
Preferred stock, shares issued                                             32,400 206,400
Preferred stock, shares outstanding                                               32,400 206,400
Convertible into common stock at a ratio                                             1.00  
Liquidation preference                                             $ 3.50  
Convertible preferred stock conversion description                                             Series D is convertible into common stock at a ratio of 1 to 1  
Number of stock incentive plans 1                                              
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 officer, director or 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 2,582,009 1,657,800 1,796,628                                          
Weighted average estimated fair value of stock options $ 1.42 $ 1.45 $ 2.74                                          
Aggregate intrinsic values of options exercisable 16,450 371,142 133,750                                          
Aggregate intrinsic values of options outstanding 16,450 524,500 169,500                                          
Aggregate intrinsic values of options exercised 183,000 14,475 0                                          
Total fair value of shares vested 1,498,040 832,177 1,145,112                                          
Total unrecognized compensation to unvested share-based compensation awards 1,203,599                                              
Weighted-average period 1 year 9 months 29 days                                              
Fair value of restricted stock awards vested         854,861 1,286,257 1,329,573                                  
Fair value of unvested restricted stock awards         380,013 514,964 300,139                                  
Weighted-average grant date fair value of restricted stock awards         $ 2.89 $ 3.91 $ 2.67                                  
Weighted-average remaining contractual term         1 year 2 months 12 days 1 year 1 year                                  
Total unrecognized compensation cost related to unvested restricted stock awards         $ 525,401