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COVID-19 Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Unusual or Infrequent Items, or Both [Abstract]        
Operating expenses $ 881 $ 1,012 $ 2,743 $ 1,433
Transportation costs 109 96 283 96
Total COVID-19 costs $ 990 $ 1,108 $ 3,026 $ 1,529