Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	December 31,
	2020		2019
Research and development claims receivable	$	24,711	$	27,567
Prepayments	10,206		7,023
VAT receivable	3,124		1,928
Lease incentive receivable	1,237		—
Other asset	—		279
Grant income receivable	414		547
Other receivable	199		482
Deferred cost	3,008		—
Total prepaid expenses and other current assets	$	42,899	$	37,826