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Lease Exit Liability (Tables)
12 Months Ended
Dec. 31, 2015
Lease Exit Liability [Abstract]  
Changes in Lease Exit Liability
Changes in the lease exit liability are as follows (in thousands):
 
Accrual balance at December 31, 2013
 
$
$9,445
 
Principal payments
  
(1,439
)
Accrual balance at December 31, 2014
  
8,006
 
Principal payments and other adjustments
  
(3,293
)
Accrual balance at December 31, 2015
 
$
$4,713
 

During 2015, the Company corrected an immaterial error attributed to the estimated lease term that resulted in a reduction of research and development expense of $1.9 million.

Future Principal Payments Under Lease Agreement
Future principal payments to be made under the lease agreement as of December 31, 2015 are as follows (in thousands):

2016
 
$
2,020
 
2017
  
2,281
 
2018
  
412
 
Total
 
$
4,713