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Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other assets, current consisted of the following (in thousands):
September 30, 2020December 31, 2019
Research and development claims receivable
$38,974 $27,567 
Prepayments
6,469 7,023 
VAT receivable
1,712 1,928 
Lease incentive receivable1,159— 
Grant income receivable
296 547 
Other assets
988 279 
Other receivables
790 482 
Total prepaid expenses and other assets, current
$50,388 $37,826