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Long-term debt - Future Principal Payments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Maturities Of Longterm Debt And Finance Lease Obligations Abstract    
2020 $ 16,372  
2021 15,096  
2022 15,852  
2023 96  
Thereafter 84  
Long-term debt and capital lease obligations, including current maturities 47,500  
Less unamortized debt discount (2,639)  
Less current portion of long term debt (16,372) $ (8,557)
Long-term debt, net of current portion $ 28,489 $ 43,217