Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

v2.4.0.6
Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2012
Stockholders' Equity [Abstract]  
Fair value measurements financial liabilities, related to warrants
                 
    June 30,
2012
    December 31,
2011
 

Risk-free interest rate

    0.33 %     0.25 %

Expected life (in years)

    1.16       1.66  

Dividend yield

    —         —    

Volatility

    111 %     84 %

Exercise price

  $ 1.86     $ 1.86  

Stock price

  $ 7.40     $ 1.22  
                 
    June 30,
2012
    December 31,
2011
 

Risk-free interest rate

    0.41 %     0.36 %

Expected life (in years)

    2.27       2.76  

Dividend yield

    —         —    

Volatility

    102 %     88 %

Exercise price

  $ 2.05     $ 2.05  

Stock price

  $ 7.40     $ 1.22  
                 
    June 30,
2012
    December 31,
2011
 

Risk-free interest rate

    0.72 %     0.60 %

Expected life (in years)

    3.71       4.21  

Dividend yield

    —         —    

Volatility

    109 %     102 %

Exercise price

  $ 2.46     $ 2.46  

Stock price

  $ 7.40     $ 1.22  
Common stock warrants valuation assumptions
                                 
(in thousands)   Fair Value as of
June 30,
2012
    Basis of Fair Value Measurements  
          Level 1     Level 2     Level 3  

August 2008 warrants

  $ 20,436     $ —       $ —       $ 20,436  

October 2009 warrants

    27,911       —         —         27,911  

March 2011 warrants

    27,412       —         —         27,412  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total common stock warrants

  $ 75,759     $ —       $ —       $ 75,759  
   

 

 

   

 

 

   

 

 

   

 

 

 

 

                                 
(in thousands)   Fair Value as of
December 31,
2011
    Basis of Fair Value Measurements  
          Level 1     Level 2     Level 3  

August 2008 warrants

  $ 1,292     $ —       $ —       $ 1,292  

October 2009 warrants

    3,738       —         —         3,738  

March 2011 warrants

    4,179       —         —         4,179  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total common stock warrants

  $ 9,209     $ —       $ —       $ 9,209  
   

 

 

   

 

 

   

 

 

   

 

 

 
Reconciliation of the warrant liability measured at Fair value
         
    Warrant Liability  

Balance at December 31, 2011

  $ 9,209  

Change in fair value of common stock warrants during six months ended June 30, 2012

    88,539  

Exercise of warrants during six months ended June 30, 2012

    (21,989
   

 

 

 

Balance at June 30, 2012

  $ 75,759