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Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2016
Prepaid Expenses And Other Current Assets [Abstract]  
Prepaid Expenses and Other Current Assets
6.      Prepaid Expenses and Other Current Assets
 
The following is a summary of prepaid expenses and other current assets at December 31, 2015 and 2016 (in thousands):
     
December 31,
  
     
2015
    
2016
  
Research and development tax credit receivable
       $ 2,093         $ 1,730    
Prepayments
         893           867    
Grant receivable
         326           —    
VAT receivable
         607           327    
Deposits
         132           132    
Other current assets
         75           41    
Prepaid expenses and other current assets
       $ 4,126         $ 3,097