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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Concentration Risk [Line Items]      
Amounts reclassified from unbilled revenue to accounts receivable $ (9,900)   $ (13,800)
Amounts reclassified from deferred revenue to revenue (3,900)    
Deductions from deferred revenue $ (3,911)   $ (5,049)
Argentina | Geographic concentration risk | Revenue from contract with customer      
Concentration Risk [Line Items]      
Concentration risk percentage (as a precent) 5.00%    
Argentina | Geographic concentration risk | Revenue benchmark      
Concentration Risk [Line Items]      
Concentration risk percentage (as a precent)   6.00%  
Subsidiaries | Argentina      
Concentration Risk [Line Items]      
Net assets $ (5,400)