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Debt - Long Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Long-term debt    
Total long-term debt $ 24,306 $ 23,718
Maturities of long-term debt    
2020 3,656  
2021 8,678  
2022 8,704  
2023 4,756  
Term loan    
Long-term debt    
Term loan payable 25,000 25,000
End of term fee 207  
Unamortized debt issuance costs (1,695) (1,990)
Total long-term debt 23,512 23,010
Other long-term debt    
Long-term debt    
Total long-term debt $ 794 $ 708