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Summary of Significant Accounting Policies - Schedule of future amortization of intangible assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Future amortization of intangible assets [Abstract]    
2018 $ 2,773  
2019 2,300  
2020 1,800  
2021 1,534  
2022 507  
Thereafter 2,756  
Total $ 11,670 $ 10,566