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Revenue Recognition (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Liability $ 177 $ 516
Additions 1,750 353
Contract liabilities revenue recognized (1,105) (692)
Contract liability $ 822 $ 177