Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION (Tables)

v2.4.0.6
STOCK BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2012
Weighted-Average Fair Value Valuation Assumptions

service periods of the awards, which is generally the vesting period. The fair value of employee stock options and employee purchase rights under the Company’s ESPP was estimated using the following weighted-average assumptions for the three and nine months ended September 30, 2012 and 2011:

 

     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2012     2011      2012     2011  

Employee Stock Options

         

Risk-free interest rate

     1.03     —           1.13     1.93

Expected term (in years)

     6.08        —           5.99        5.97   

Dividend yield

     —          —           —          —     

Volatility

     98     —           106     91

Weighted-average fair value of stock options granted

   $ 5.87      $ —         $ 5.12      $ 1.23   

 

     Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
     2012     2011     2012     2011  

Employee Stock Purchase Plan (ESPP):

        

Risk-free interest rate

     0.21     0.13     0.21     0.15

Expected term (in years)

     1.25        1.25        1.25        1.25   

Dividend yield

     —          —          —          —     

Volatility

     111     80     111     80

Weighted-average fair value of ESPP purchase rights

   $ 4.62      $ 0.66      $ 3.46      $ 0.66   
Stock-Based Compensation Expense

Stock-based compensation expense, which consists of the compensation cost for employee stock options and ESPP, and the value of options issued to non-employees for services rendered, was allocated to research and development and general and administrative as follows (in thousands):

 

     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2012      2011      2012      2011  

Amortization of stock-based compensation:

           

Research and development

   $ 471       $ 141       $ 1,082       $ 328   

General and administrative

     473         151         1,005         415   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 944       $ 292       $ 2,087       $ 743   
  

 

 

    

 

 

    

 

 

    

 

 

 
Stock Option Activity Under Equity Incentive Plan

The following table summarizes stock option activity under the Company’s 2004 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

     1,787,000      $ 6.28         —           —     

Exercised

     (330,352 )   $ 1.36         —           —     

Forfeitures

     —        $ —           —           —     
  

 

 

         

Outstanding at September 30, 2012

     5,128,827      $ 3.14         8.24       $ 21,102,085   
  

 

 

         

Vested and expected to vest September 30, 2012

     5,068,823      $ 3.12         8.23       $ 20,964,921   

Exercisable at September 30, 2012

     2,089,451      $ 1.78         7.24       $ 11,398,737