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Prepaid Expenses and Other Assets, Current (Tables)
3 Months Ended
Mar. 31, 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):
March 31, 2021December 31, 2020
Research and development claims receivable$30,791 $24,711 
Prepayments7,477 10,206 
VAT receivable3,292 3,124 
Lease receivables from terminations4,480 1,237 
Grant income receivable411 414 
Other receivable257 199 
Deferred cost1,554 3,008 
     Total prepaid expenses and other current assets$48,262 $42,899