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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Summary of share-based compensation expense related to stock options, restricted stock and restricted stock units by expense category

The following table summarizes share-based compensation expense related to stock options, restricted stock and restricted stock units by expense category (in thousands):

 

 

 

 

 

Three Months Ended
March 31,

 

 

 

2013

2012

 

 

 

Research and development             

$              396             

$              —             

General and administrative             

              3,070             

              —             

 

 

 

Share-based compensation expense included in operating expenses             

$              3,466             

$              —             

 

 

 

 
Summary of stock option activity and related data

A summary of the Company’s stock option activity and related data for the three months ended March 31, 2013 follows:

 

 

 

 

 

Outstanding Options

 

 

 

Number of
Shares

Weighted-Average
Exercise Price

 

 

 

Balance at December 31, 2012             

              592,230,567             

$              0.0655             

Granted             

              —             

              —             

Forfeited/Expired             

              —             

              —             

 

 

 

Balance at March 31, 2013             

              592,230,567             

$              0.0655