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Goodwill and Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Estimated future amortization expense    
2018 (remaining six months) $ 781  
2019 1,130  
2020 1,015  
2021 384  
Carrying Value $ 3,310 $ 4,092