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Goodwill (Additional Information) (Details) - USD ($)
$ in Thousands
Apr. 16, 2018
Sep. 30, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill   $ 65,154 $ 16,955
Netherlands-Based Game Development Studio      
Acquired Finite-Lived Intangible Assets [Line Items]      
Percentage of shares acquired 100.00%    
Net purchase price $ 4,200