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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Intangible Assets.          
Amortization of Intangible Assets $ 200 $ 100 $ 335 $ 290  
Estimated amortization expense          
Remainder of 2018 350   350    
2019 593   593    
2020 557   557    
2021 557   557    
2022 557   557    
2023 and thereafter 1,636   1,636    
Total $ 4,250   $ 4,250   $ 3,785