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Prepayments and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Insurance premiums $ 501 $ 641
Vendor prepayment 0 602
Rents, licenses and other 1,204 1,146
Total prepayments and other current assets $ 1,705 $ 2,389