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Prepaid Expenses and Other Current Assets (Tables)
3 Months Ended
Mar. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 
March 31,
2020
 
December 31,
2019
Research and development claims receivable
$
29,753

 
$
27,567

Prepayments
5,181

 
7,023

VAT receivable
872

 
1,928

Grant income receivable
330

 
547

Other assets
334

 
279

Other receivable
374

 
482

Total prepaid expenses and other current assets
$
36,844

 
$
37,826