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Revenue from Contracts with Customers (ASC 606) - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]        
Revenue recognized $ 523 $ 453 $ 1,739 $ 1,360