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Restructuring (Tables)
 6 Months Ended
Jun. 30, 2013
Restructuring [Abstract]  
Activity in restructuring accrual
Activity in the restructuring accrual, which is included in accounts payable and accrued expenses in our Consolidated Balance Sheets and research and development and general and administrative expenses in the Consolidated Statements of Operations, is specified below.

 
 
Severance and Related Benefits
  
Other Exit Costs
  
Contract Termination Costs
  
Total Restructuring Accrual
 
Balance at December 31, 2012
 
$
813
  
$
-
  
$
-
  
$
813
 
Additions, net
  
1,477
   
-
   
-
   
1,477
 
Payments
  
(854
)
  
-
   
-
   
(854
)
Balance at March 31, 2013
  
1,436
   
-
   
-
   
1,436
 
Additions, net
  
15
   
15
   
1,359
   
1,389
 
Payments
  
(914
)
  
(15
)
  
(1,359
)
  
(2,288
)
Balance at June 30, 2013
 
$
537
  
$
-
  
$
-
  
$
537