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Intangible Assets - Finite-Lived Amortization Expense by Fiscal Year (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2018 $ 229    
2019 229    
2021 229    
2022 38    
Total finite-lived intangible assets, net $ 725 $ 953 $ 1,183