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Accrued and Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2016
Accrued and Other Current Liabilities  
Schedule of accrued and other current liabilities
     
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