Schedule of Prepaid Expenses and Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prepaid Expenses And Current Assets
Prepayment of fixed assets	$ 346	$ 2,715
Prepayment of inventory	305	59
Other	98	99
Total prepaid expenses and current assets	$ 749	$ 2,873