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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES

NOTE 6. ACCOUNTS PAYABLE AND ACCRUED LIABILITIES

Accounts payable and accrued liabilities at December 31, 2017 and 2016 consisted of the following (in thousands):

 

     December 31,  
     2017      2016  

Accrued employee related costs

    $ 24,901      $ 9,559  

Accounts payable

      5,648        5,085  

Accrued development costs

      4,799        5,543  

Other accrued liabilities

      18,172        5,995  
  

 

 

     

 

 

  
   $ 53,520      $ 26,182