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Goodwill and Other Intangible Assets - Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Cost of subscriptions and licenses $ 3,426 $ 2,760    
Amortization of purchased intangibles 10,984 10,402 $ 18,008 $ 16,840
Total amortization expense $ 14,410 $ 13,162