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Prepaid Expenses and Other Assets, Current | 3 Months Ended
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Mar. 31, 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):
| March 31, 2021 |  | December 31, 2020
Research and development claims receivable | $ | 30,791 |  |  | $ | 24,711 |
Prepayments | 7,477 |  |  | 10,206 |
VAT receivable | 3,292 |  |  | 3,124 |
Lease receivables from terminations | 4,480 |  |  | 1,237 |
Grant income receivable | 411 |  |  | 414 |
Other receivable | 257 |  |  | 199 |
Deferred cost | 1,554 |  |  | 3,008 |
Total prepaid expenses and other current assets | $ | 48,262 |  |  | $ | 42,899 |
The decrease in prepayments of $2.7 million as at March 31, 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 in the period when compared to the same period in the prior year. 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.

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