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Prepaid Expenses and Other Assets, Current (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Research and development claims receivable $ 41,517 $ 24,711
Prepayments 8,251 10,206
VAT receivable 1,309 3,124
Lease receivables from terminations 0 1,237
Other asset 545 0
Lease deposits receivable 544 0
Grant income receivable 281 414
Other receivable 10,660 199
Deferred cost 1,300 3,008
Total prepaid expenses and other current assets $ 64,407 $ 42,899