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Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2019
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, 2018 and 2019 (in thousands):

 

 

 

 

 

 

 

 

 

 

December 31, 

 

December 31, 

 

    

2018

    

2019

Research and development tax credit receivable

 

$

1,148

 

$

1,326

Prepayments and VAT receivable

 

 

899

 

 

703

Other current assets

 

 

236

 

 

103

 

 

$

2,283

 

$

2,132