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Accounts Payable and Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2015
Accounts Payable and Accrued Liabilities [Abstract]  
Accounts payable and accrued liabilities
At December 31, 2015 and 2014, accounts payable and accrued liabilities consist of the following (in thousands):

  
December 31,
 
  
2015
 
2014
 
Accounts payable
 
$
2,798
  
$
2,297
  
Accrued expenses
  
5,021
   
3,125
  
Accrued bonuses
  
1,126
   
964
  
Other current liabilities
  
432
   
417
  
Total
 
$
9,377
  
$
6,803