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Internal-Use Software Development Costs - Capitalized Computer Software (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Research and Development [Abstract]    
Internal use software development costs, gross $ 90,451 $ 81,475
Less: Accumulated amortization (56,908) (51,452)
Internal use software development costs, net $ 33,543 $ 30,023