Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Tables)

v2.4.0.8
Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2013
Stock-based Compensation [Abstract]  
Weighted average assumptions
The fair value of the stock options granted was estimated based on the following weighted average assumptions for three and six months ended June 30, 2013 and 2012:

 
 
Three Months Ended June 30,
   
Six Months Ended June 30,
 
 
 
2013
   
2012
   
2013
   
2012
 
Dividend yield
   
0
%
   
0
%
   
0
%
   
0
%
Expected volatility
   
92
%
   
92
%
   
92
%
   
92
%
Risk-free interest rate
   
1.44
%
   
0.72
%
   
0.84
%
   
1.05
%
Expected term
 
5.6 years
   
5.6 years
   
5.6 years
   
5.6 years
 
Stock option activity
Stock option activity for the six months ended June 30, 2013 was as follows:
 
 
 
Options
   
Weighted Average Exercise Price Per Share
   
Weighted Average Remaining Contractual Life (in years)
   
Aggregate Intrinsic Value (in thousands)
 
Options outstanding at December 31, 2012
   
6,788,383
   
$
8.99
     
7.36
   
$
1,531
 
Granted
   
1,088,703
     
3.02
                 
Exercised
   
(129,317
)
   
1.69
                 
Forfeited, expired or cancelled
   
(75,829
)
   
27.68
                 
Options outstanding at June 30, 2013
   
7,671,940
   
$
8.08
     
7.31
   
$
4,868
 
Options exercisable at June 30, 2013
   
4,647,726
   
$
11.36
     
6.23
   
$
2,506
 
Unvested RSU activity
Unvested RSU activity for the six months ended June 30, 2013 is summarized below:

 
 
Number of Shares
   
Weighted-Average Grant-Date Fair Value
 
Unvested balance at December 31, 2012
   
1,459,853
   
$
2.75
 
Granted
   
949,310
     
3.84
 
Vested
   
(164,998
)
   
2.50
 
Forfeited
   
(16,260
)
   
2.22
 
Unvested balance at June 30, 2013
   
2,227,905
   
$
2.59
 
 
               
Stock-based compensation expense
The following table shows total stock-based compensation expense included in the condensed consolidated statements of comprehensive loss for the three and six months ended June 30, 2013 and 2012 (in thousands):

 
 
Three Months Ended June 30,
   
Six Months Ended June 30,
 
 
 
2013
   
2012
   
2013
   
2012
 
Research and development
 
$
432
   
$
295
   
$
1,429
   
$
680
 
Selling, general and administrative
   
667
     
277
     
1,290
     
566
 
Total stock-based compensation expense
 
$
1,099
   
$
572
   
$
2,719
   
$
1,246