Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid external research and development expenses	$ 2,271	$ 2,438
Inventories	1,919	2,016
Other prepayments	3,579	6,128
VAT receivable	1,122	1,169
Construction deposit - current	7,909	7,909
Non-trade receivables	2,277	3,351
Total prepaid expenses and other current assets	$ 19,077	$ 23,011