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Goodwill and Other Intangible Assets - Summary of Changes in Carrying Value of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Initial value of PistonHeads acquisition $ 15,521
Foreign currency translation adjustment (38)
Purchase price adjustment (655) [1]
Balance at September 30, 2019 $ 14,828
[1] The purchase price adjustment corresponds to an adjustment for the deferred tax liability as the Company continues to refine income tax treatment.