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Summary of Significant Accounting Policies - Schedule of Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortization Expense    
2018 $ 237  
2019 237  
2020 237  
2021 237  
2022 227  
Thereafter 2,046  
Intangible assets subject to amortization, net $ 3,221 $ 3,458