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Goodwill and Intangible Assets, Net - Estimated Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
For the remaining three months ending December 31, 2019 $ 625  
2020 2,500  
2021 417  
Total amortizable intangible assets $ 3,542 $ 5,417