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Accrued and Other Current Liabilities
12 Months Ended
Dec. 31, 2017
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, 2016 and 2017 (in thousands):
     
December 31,
 
     
2016
   
2017
 
Accrued research and development
      $ 2,138         $ 1,645    
Accrued legal and professional fees
        194           248    
Other current liabilities
        430           662    
        $ 2,762         $ 2,555    
 
Other current liabilities in 2017 include $150,000 deferred income in respect of payment received in advance of achieving a milestone under the ManRos agreement (see Note 3 — Significant Contracts).