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Restructuring (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2013
 
$
-
  
$
-
  
$
-
  
$
-
 
Additions, net
  
358
   
-
   
-
   
358
 
Payments
  
(146
)
  
-
   
-
   
(146
)
Balance at March 31, 2014
  
212
   
-
   
-
   
212
 
Additions, net
  
1
   
-
   
-
   
1
 
Payments
  
(164
)
  
-
   
-
   
(164
)
Balance at June 30, 2014
  
49
   
-
   
-
   
49
 
Additions, net
  
-
   
-
   
-
   
-
 
Payments
  
(49
)
  
-
   
-
   
(49
)
Balance at September 30, 2014
 
$
-
  
$
-
  
$
-
  
$
-
 

  
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
 
Additions, net
  
-
   
-
   
-
   
-
 
Payments
  
(448
)
  
-
   
-
   
(448
)
Balance at September 30, 2013
 
$
89
  
$
-
  
$
-
  
$
89