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Capitalized Software Development Costs, net - Software Development Costs (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Research and Development [Abstract]    
Capitalized software development costs, gross $ 96,974 $ 81,475
Less: Accumulated amortization (61,515) (51,452)
Capitalized software development costs, net $ 35,459 $ 30,023