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Accrued and Other Current Liabilities
12 Months Ended
Dec. 31, 2016
Accrued and Other Current Liabilities  
Accrued and Other Current Liabilities
8.      Accrued and Other Current Liabilities
 
Accrued and other current liabilities consisted of the following at December 31, 2015 and 2016 (in thousands):
     
December 31,
 
     
2015
   
2016
 
Accrued research and development
      $ 3,284         $ 2,138    
Accrued legal and professional fees
        291           194    
Other current liabilities
        238           430    
        $ 3,813         $ 2,762