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Summary of Significant Accounting Policies - Schedule of future amortization of intangible assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Future amortization of intangible assets [Abstract]    
2019 $ 3,198  
2020 2,698  
2021 1,856  
2022 879  
2023 497  
Thereafter 1,331  
Total $ 10,459 $ 11,670