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Prepaid Expenses and Other Assets, Current (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Research and development claims receivable $ 30,791 $ 24,711
Prepayments 7,477 10,206
VAT receivable 3,292 3,124
Lease receivables from terminations 4,480 1,237
Grant income receivable 411 414
Other receivable 257 199
Deferred cost 1,554 3,008
Total prepaid expenses and other current assets $ 48,262 $ 42,899