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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Years ending December 31:      
2019 $ 720    
2020 741    
2021 763    
2022 786    
2023 805    
Thereafter 466    
Total 4,281    
Total rent expense $ 600 $ 800 $ 500