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Prepaid expenses and other current assets
 12 Months Ended
Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]  
Prepaid expenses and other current assets Prepaid expenses and other current assets
Prepaid expenses and other current assets consists of the following as of December 31, 2022 and 2021 (in thousands):
As of December 31,
20222021
Prepaid insurance2,951 6,809 
Value-added tax receivable27,928 10,299 
Prepaid research and development expenses— 10,415 
Prepaid and other current assets60,886 2,900 
$91,765 $30,423 
The Company made contractual advance payments during 2021 for research and development services to be provided by suppliers in 2022. The Company paid value-added taxes on certain capital expenditures and submitted requests for refunds from tax authorities in foreign countries with a concentration in Europe that are pending repayment as of December 31, 2022 and 2021. Prepaid and other current assets include payments to certain suppliers in advance of production.
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