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Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 1,154  
2020 2,180  
2021 2,150  
2022 1,270  
2023 789  
Thereafter 187  
Intangible assets, net $ 7,730 $ 9,006