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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Research and development claims receivable $ 38,974 $ 27,567
Prepayments 6,469 7,023
VAT receivable 1,712 1,928
Lease incentive receivable 1,159 0
Grant income receivable 296 547
Other assets 988 279
Other receivables 790 482
Total prepaid expenses and other assets, current $ 50,388 $ 37,826