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Contractual Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 $ 616    
2020 121    
2021 68    
2022 4    
Total 809    
Rent expense $ 2,400 $ 2,200 $ 2,400