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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Research and development claims receivable $ 36,548 $ 23,678
Prepayments 7,175 8,713
VAT receivable 2,344 1,849
Accounts receivable 2,088 0
Lease and lease deposit receivable 29 68
Other asset 135 240
Grant income receivable 2 384
Other receivable 271 271
Deferred cost 351 1,073
Total prepaid expenses and other current assets $ 48,943 $ 36,276