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Acquisitions - Schedule of Contingent Consideration Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition, Contingent Consideration [Line Items]      
Accruals and other current liabilities $ 3,583 $ 5,100 $ 2,390
Other liabilities   5,100 $ 2,390
Series of Individually Immaterial Business Acquisitions      
Business Acquisition, Contingent Consideration [Line Items]      
Accruals and other current liabilities 3,583 5,100  
Other liabilities 1,560 1,499  
Contingent consideration from acquisitions $ 5,143 $ 6,599