Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Tables)

v2.4.0.6
Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2012
Stock Based Compensation [Abstract]  
Weighted-Average fair value valuation assumptions
                                 
    Three Months Ended
June 30,
    Six Months Ended
June 30,
 
    2012     2011     2012     2011  

Employee Stock Options

                               

Risk-free interest rate

    1.13     1.93     1.14     1.93

Expected term (in years)

    5.96       5.96       5.98       5.97  

Dividend yield

    —         —         —         —    

Volatility

    107     91     107     91

Weighted-average fair value of stock options granted

  $ 5.64     $ 1.23     $ 5.03     $ 1.23  

 

                                 
    Three Months Ended
June 30,
    Six Months Ended
June 30,
 
    2012     2011     2012     2011  

Employee Stock Purchase Plan (ESPP):

                               

Risk-free interest rate

    0.20     0.5     0.20     0.5

Expected term (in years)

    1.25       1.25       1.25       1.25  

Dividend yield

    —         —         —         —    

Volatility

    111     79     111     79

Weighted-average fair value of ESPP purchase rights

  $ 2.04     $ 0.84     $ 2.04     $ 0.84  
Stock-Based compensation expense
                                 
    Three Months Ended
June 30,
    Six Months
Ended June 30,
 
    2012     2011     2012     2011  

Amortization of stock-based compensation:

                               

Research and development

  $ 370     $ 88     $ 611     $ 188  

General and administrative

    374       114       532       264  
   

 

 

   

 

 

   

 

 

   

 

 

 
    $ 744     $ 202     $ 1,143     $ 452  
   

 

 

   

 

 

   

 

 

   

 

 

 
Stock option activity under equity incentive plan
                                 

Options

  Number of
Shares
    Weighted-
Average
Exercise
Price
    Weighted-
Average
Remaining
Contractual
Term
    Aggregate
Intrinsic
Value
 

Outstanding at December 31, 2011

    3,672,179     $ 1.45       —         —    

Granted

    1,591,000     $ 6.13       —         —    

Exercised

    (191,301 )   $ 1.27       —         —    

Forfeitures

    —       $ —         —         —    
   

 

 

                         

Outstanding at June 30, 2012

    5,071,878     $ 2.92       8.40     $ 22,700,291  
   

 

 

                         

Vested and expected to vest June 30, 2012

    5,005,471     $ 2.90       8.39     $ 22,514,740  

Exercisable at June 30, 2012

    1,964,595     $ 1.55       7.32     $ 11,492,141