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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Stockholders' Equity [Abstract]  
Stock Option Activity

The following tables summarize the activity of the 2007 Plan for options:

 

    Shares     Weighted-Average Exercise Price     Weighted-Average Remaining Contractual Term  
Options                        
Outstanding January 1, 2010     4,913,366     $ 3.88       8.1  
Granted     2,722,131       2.50          
Exercised     (22,316 )     2.56          
Forfeited     (2,273,768 )     3.89          
Outstanding, December 31, 2010     5,339,413     $ 3.18       8.3  
Granted     1,934,566       1.71          
Exercised     (44,464 )     2.66          
Forfeited     (936,533 )     3.07          
Outstanding, December 31, 2011     6,292,982     $ 2.74       8.0  
Granted     852,139       1.22          
Exercised     (31,474 )     1.24          
Forfeited     (888,035 )     2.91          
Outstanding, December 31, 2012     6,225,612     $ 2.52       7.4  
                         
      Shares       Weighted-Average Exercise Price       Weighted-Average Remaining Contractual Term  
Exercisable, December 31, 2012     4,044,636     $ 2.86       6.6  
Vested and expected to vest, December 31, 2012     5,963,894     $ 2.55       7.3  

 
Assumptions Used to Estimate Fair Value of Stock Option Award Using Black-Scholes Valuation Model

 

    December 31,  
    2012     2011     2010  
Weighted-average volatility     86 %     83 %     87 %
Risk-free rate     0.79% - 1.18 %     0.79% - 2.79 %     0.28% - 3.2 %
Expected annual dividend yield     -       -       -  
Expected weighted-average life, in years     5.9       5.9       6.0  
Restricted Stock Activity

The following table summarizes the activity of the 2007 plan for restricted shares:

 

    Shares     Weighted-Average Grant Date Fair Value     Aggregate Intrinsic Value  
Restricted Shares                        
Outstanding January 1, 2010     305,316     $ 3.36     $ 598,419  
Granted     35,000       2.67          
Vested     (101,899 )     3.29          
Forfeited     (127,286 )     3.95          
Outstanding, December 31, 2010     111,131     $ 2.92     $ 470,084  
Granted     145,000       1.43          
Vested     (123,066 )     2.59          
Forfeited     (9,168 )     2.46          
Outstanding, December 31, 2011     123,897     $ 1.53     $ 157,349  
Granted     -       -          
Vested     (110,564 )     1.53          
Forfeited     -       -          
Outstanding, December 31, 2012     13,333     $ 1.59     $ 14,933  

 
Warrants Outstanding Table

At December 31, 2012 and 2011 there were warrants outstanding to purchase 5,620,128 and 5,573,544 shares of our common stock, respectively. At December 31, 2010, there were warrants outstanding to purchase 5,202,121 shares of our common stock (of which 1,323,214 were not exercisable until January 2011). The warrants outstanding as of December 31, 2012 were as follows:

 

Number of Common Shares Underlying Warrants     Issue Date/Exercisable Date   Exercise Price     Expiration Date
  100,778 (1)   Mar-07 / Mar-07   $ 3.97     Mar-17
  705,354 (2)   Mar-09 / Sep-09   $ 3.00     Sep-14
  2,572,775 (1)   Jul-09 / Jan-10   $ 2.50     Jan-15
  500,000 (2)   Apr-10 / Oct-10   $ 1.89     Oct-15
  1,323,214 (2)   Jul-10 / Jan-11   $ 1.63     Jan-17
  371,423 (2)   Jun-11 / Jun-11   $ 3.50     Jun-16
  46,584 (1)   Mar-12 / Mar-12   $ 1.61     Mar-22
  5,620,128                  

 

  (1) These warrants to purchase common stock are classified as equity.

 

  (2) These warrants to purchase common stock are classified as derivative liabilities. The fair value of these liabilities (see note 4) is remeasured at the end of every reporting period and the change in fair value is reported in the consolidated statements of operations as other income (expense).