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Prepayments and Other Current Assets
 12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepayments and Other Current Assets Prepayments and Other Current Assets
The components of prepayments and other current assets were as follows at the dates indicated (in thousands):

December 31,
20212020
Insurance premiums$641 $690 
Vendor prepayment602 1,085 
Rents, licenses and other1,146 1,189 
Total prepayments and other current assets$2,389 $2,964