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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Sales consideration for unsatisfied performance obligation $ 1.6      
One customer | Customer concentration risk | Revenue        
Disaggregation of Revenue [Line Items]        
Concentration risk 74.10% 53.80% 78.20% 69.10%