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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Adoption of new accounting pronouncements      
Accounts receivable, net of allowance $ 54,475   $ 62,405
Accumulated other comprehensive loss $ (13,690)   $ (13,295)
ASU 2016-01 | Adjustment      
Adoption of new accounting pronouncements      
Accounts receivable, net of allowance   $ (300)  
Accumulated other comprehensive loss   $ (300)