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Prepaid Expenses and Other Assets, Current
 6 Months Ended
Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Assets, Current Prepaid Expenses and Other Assets, Current
Prepaid expenses and other assets, current consisted of the following (in thousands):
June 30, 2021December 31, 2020
Research and development claims receivable$37,333 $24,711 
Prepayments6,491 10,206 
VAT receivable2,588 3,124 
Lease receivables from terminations1,703 1,237 
Other asset237 — 
Lease deposits receivable648 — 
Grant income receivable140 414 
Other receivable1,811 199 
Deferred cost1,993 3,008 
     Total prepaid expenses and other current assets$52,944 $42,899 

The increase in research and development claims receivable is due to an increase in the effective tax rate when compared to the same period last year. More information on the movement in the tax position between periods can be found in Note 9.
The decrease in prepayments of $3.7 million as at June 30, 2021 when compared to December 31, 2020 is primarily related to decreases in prepayments for clinical trials and lower payments of directors' and officers' liability insurance due to the timing of payments. .