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Accounts payable and accrued liabilities
6 Months Ended
Jun. 30, 2016
Payables and Accruals [Abstract]  
Accounts payable and accrued liabilities
Accounts payable and accrued liabilities

Accounts payable and accrued liabilities consisted of the following (in thousands):
 
June 30,
 
December 31,
 
2016
 
2015
 
 
 
 
Accounts payable
$
4,445

 
$
2,104

Accrued expenses
7,002

 
5,311

Accrued compensation and benefits
2,307

 
2,352

Other current liabilities
36

 
31

 
$
13,790

 
$
9,798