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Financing (Tables)
 3 Months Ended
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Significant Terms Debentures for Entire Hybrid Instrument [Table Text Block]

The following table summarizes the significant terms of each of the debentures for which the entire hybrid instrument is recorded at fair value as of March 31, 2013:

 

                      Conversion Price – Lower of Fixed Price or Percentage of VWAP for Look-back period      
                      Default           Anti-Dilution                
Debenture     Face       Interest       Interest     Fixed   Adjusted         Default     Look-back
Issuance Year     Amount       Rate       Rate     Price   Price   %     %     Period
      (in thousands)                                              
2006   $ 5,974       9.5 %     n/a     $  2.00   $ 0.00099   90 %    n/a     125 Days
2007     6,701       9.5 %     n/a     $  2.00         80%-90 %    n/a     125 Days
2008     6,468       9.5 %     20%-24 %    $  1.00-$2.00   $  0.00088-$0.00099   80%-95 %   50%-75 %    125 Days
2009     1,349       9.5 %     20 %    $  2.00   $ 0.001045   95 %    50 %    125 Days
2010     3,806       9.5 %     20 %    $  0.10- $0.30   $ 0.001045   95 %    50 %    60 Days
2011     1,705       9.5 %     20 %    $  0.10   $ 0.001045   95 %    50 %    60 Days
2012     1,573       9.5 %     20 %    $  0.10   $ 0.001045   95 %    50 %    60 Days
Total   $ 27,576                                              
Schedule of Significant Terms of Debentures Carried at Amortized Cost [Table Text Block]

The table below summarizes the significant terms of the debentures that are carried at their amortized cost and for which the compound embedded derivative is bifurcated and accounted for as a derivative liability as of March 31, 2013:

 

                    Conversion Price – Lower of Fixed Price or Percentage of VWAP for Look-back Period  
                       
                Default         Anti-Dilution            
Debenture   Face     Interest     Interest   Fixed     Adjusted           Look-back
Issuance Year   Amount     Rate     Rate   Price     Price     %     Period
    (in thousands)                                  
2006   $ 53       10 %   n/a   $ 2       0.00099       90 %   125 days
Schedule of Number of Shares Issued Convertible Preferred Stock [Table Text Block]

The following table provides a summary of the preferred stock conversions that have occurred since inception and the number of common shares issued upon conversion.

 

    Preferred     Preferred     Preferred     Common  
    shares     shares     shares     shares  
    issued     converted     remaining     issued  
    (in thousands)  
                         
Series C preferred stock     22       17       5       273,382  
Series D preferred stock     25       22       10       245,162
Schedule of Debt Conversions [Table Text Block]

The outstanding principal and accrued interest for the debentures as of March 31, 2013 is reflected in the following table in addition to the principal and interest converted since inception and the number of common shares issued upon conversion.

 

    Outstanding     Principal and        
    principal and     accrued interest     Common  
    accrued interest at     converted since     Shares  
    March 31, 2013     inception     Issued  
    (in thousands)  
                         
Debentures     $40,762       $11,069       2,804,842  
Schedule of Activities of Compound Embedded Derivative [Table Text Block]

The following tables reflects the face value of the instruments, their amortized carrying value and the fair value of the separately-recognized compound embedded derivative, as well the number of common shares into which the instruments are convertible as of March 31, 2013 and December 31, 2012.

 

March 31, 2013                     Embedded     Common  
    Face     Carrying     Accrued     Conversion     Stock  
    Value     Value     Interest     Feature     Shares  
    (in thousands)  
                               
Series C preferred stock   $ 4,840     $ 4,840       0     $ 2,277       4,535,769  
Series D preferred stock   $ 348     $ 348       0       164       326,242  
                                         
Debentures:                                        
2006   $ 53     $ 53     $ 7       5       60,917  
Total   $ 53     $ 53     $ 7     $ 2,446       4,922,928  

 

December 31, 2012                     Embedded     Common  
    Face     Carrying     Accrued     Conversion     Stock  
    Value     Value     Interest     Feature     Shares  
    (in thousands)  
                               
Series C preferred stock   $ 4,840     $ 4,804     $ -     $ 1,988       923,953  
Series D preferred stock   $ 348     $ 348     $ -       143       66,457  
                                         
Debentures:                                        
2006   $ 53     $ 53     $ 7       16       11,871  
Total   $ 53     $ 53     $ 7     $ 16       1,002,281  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Changes in the fair value of derivative instrument liabilities related to the bifurcated embedded derivative features of convertible instruments not carried at fair value are reported as “Gain (loss) from change in fair value of derivative liability – Series C and Series D preferred stock and debentures” in the accompanying consolidated statements of operations.

 

    Three months ended March 31,  
    2013     2012  
    (in thousands)  
Series C preferred stock   $ (289 )   $ (15,117 )
Series D preferred stock     (21 )     (3,292 )
                 
Debentures:                
2006     11       (21,885 )
2008     -       (14,741 )
2009     -       (5,450 )
2010     -       (11,935 )
2011     -       (13,721 )
2012     -       (3,508 )
Gain (loss) from change in fair value of derivative liability   $ (299 )   $ (89,649 )
Schedule of Hybrid Financial Instrument Disclosure [Table Text Block]

The following table reflects the face value of the financial instruments, the fair value of the hybrid financial instrument and the number of common shares into which the instruments are convertible as of March 31, 2013 and December 31, 2012.

 

                Common  
March 31, 2013   Face     Fair     Stock  
    Value     Value     Shares  
    (in thousands)  
Debentures:                        
2006   $ 5,974     $ 11,852       8,962,027  
2007     6,701       14,654       11,184,898  
2008     6,468       13,835       10,600,859  
2009     1,349       2,833       2,114,786  
2010     3,806       6,553       4,949,323  
2011     1,705       2,379       1,404,486  
2012     1,573       2,297       1,545,805  
Total   $ 27,576     $ 54,403       40,762,184  

 

                Common  
December 31, 2012   Face     Fair     Stock  
    Value     Value     Shares  
    (in thousands)  
Debentures:                        
2006   $ 6,180     $ 14,758       5,196,283  
2007     6,856       17,172       6,098,480  
2008     6,468       15,492       5,487,497  
2009     1,644       3,565       1,243,390  
2010     3,806       7,178       2,512,724  
2011     1,954       3,080       1,084,237  
2012     1,979       3,047       1,073,527  
Total   $ 28,887     $ 64,292       22,696,138  
Schedule of Fair Value Hybrid Financial Instrument Disclosure [Table Text Block]

Changes in the fair value of convertible instruments that are carried in their entirety at fair value are reported as “Gain (loss) from change in fair value of hybrid financial instruments” in the accompanying consolidated statements of operations. The changes in fair value of these hybrid financial instruments were as follows:

 

    Three months ended March 31,  
    2013     2012  
    (in thousands)  
             
2006   $ 1,887     $ -  
2007     2,329       (25,057 )
2008     1,657       -6,113  
2009     (74 )     -  
2010     623       -  
2011     249       -  
2012     103       -  
Gain (loss) from changes in fair value of hybrid instruments   $ 6,774     $ (31,170 )
Schedule of Warrants Embedded Warrants Fair Value Outstanding and Anti-Dilutive Adjustment Disclosure [Table Text Block]

Warrants - The following table summarizes the warrants outstanding, their fair value and their exercise price after adjustment for anti-dilution provisions:

 

          March 31, 2013     December 31, 2012  
          Anti-Dilution                 Anti-Dilution              
          Adjusted                 Adjusted              
    Expiration     Exercise           Fair     Exercise           Fair  
    Year     Price     Warrants     Value     Price     Warrants     Value  
Warrants issued with preferred stock:         (in thousands)           (in thousands)  
Series D preferred stock     2017       0.000100       87,368     $ 101       0.00684       328,947     $ 709  
                                                         
Warrants issued with debentures:                                                        
2008     2015       0.000100       238,079       267       0.00684       896,382       1,691  
2010     2015       0.000100       81,350       91       0.00684       306,287       571  
2011     2016       0.000100       58,246       66       0.00684       219,298       453  
2012     2017       0.000100       34,947       40       0.00684       131,579       263  
Total                     499,990     $ 565               1,882,493     $ 3,687  
Schedule of Changes in Fair Value of Warrants [Table Text Block]

Changes in the fair value of the warrants are reported as "(Gain) loss from change in fair value of derivative liability - warrants" in the accompanying consolidated statement of operations. The changes in the fair value of the warrants were as follows:

 

    Three months ended March 31,  
    2013     2012  
Warrants issued with preferred stock:   (in thousands)  
Series D preferred stock     608       (6,871 )
                 
Warrants issued with debentures:                
2007     -       (3,337 )
2008     1,424       (18,543 )
2010     480       (6,342 )
2011     387       (4,577 )
2012     223       (1,818 )
Total   $ 3,122     $ (41,488 )
Schedule of Reconciliation Changes in Fair Value of Financial Instruments and Hybrid Instruments Carried at Fair Value [Table Text Block]

The following represents a reconciliation of the changes in fair value of financial instruments measured at fair value using Level 3 inputs and changes in the fair value of hybrid instruments carried at fair value during the three months ended March 31, 2013:

 

    Compound                    
    Embedded     Warrant     Hybrid        
    Derivatives     Derivatives     Instruments     Total  
                                 
Beginning balance, December 31, 2012:   $ 2,147     $ 3,687     $ 64,292     $ 70,126  
                                 
Fair value adjustments:                                
    Compound embedded derivatives     299       -       -       299  
    Warrant derivatives     -       (3,122 )     -       (3,122 )
    Hybrid instruments     -       -       (6,774 )     (6,774 )
                                 
Conversions:                                
  August 24, 2006 financing     -       -       (516 )     (516 )
  December 29, 2006 financing     -       -       (503 )     (503 )
  March 27, 2007 financing     -       -       (190 )     (190 )
  July 15, 2009 financing     -       -       (614 )     (614 )
  August 14, 2009 financing     -       -       (192 )     (192 )
  April 13, 2011 financing     -       -       (199 )     (199 )
  October 25, 2011 financing     -       -       (37 )     (37 )
  December 8, 2011 financing     -       -       (217 )     (217 )
  March 26, 2012 financing     -       -       (141 )     (141 )
  June 1, 2012 financing     -       -       (506 )     (506 )
Ending balance, March 31, 2013   $ 2,446     $ 565     $ 54,403     $ 57,414