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Segment and Geographic Information - Narrative (Details) - Segment
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Number of operating segments 2  
Number of reportable segments 1  
No Customer | Revenue | Customer Concentration Risk    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Concentration risk, percentage 10.00% 10.00%