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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
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
Prepaid Expense and Other Assets, Current $ 36,844 $ 37,826