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Prepaid Expenses and Other Assets, Current (Tables)
9 Months Ended
Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other assets, current consisted of the following (in thousands):
September 30, 2021December 31, 2020
Research and development claims receivable$41,517 $24,711 
Prepayments8,251 10,206 
VAT receivable1,309 3,124 
Lease receivables from terminations— 1,237 
Other asset545 — 
Lease deposits receivable544 — 
Grant income receivable281 414 
Other receivable10,660 199 
Deferred cost1,300 3,008 
Total prepaid expenses and other current assets$64,407 $42,899