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Long-term debt - Future Principal Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Future principal payments of long-term debt including capital leases    
2019 $ 8,557  
2020 15,761  
2021 15,020  
2022 15,770  
Future principal payments 55,108  
Less unamortized debt discount (3,334)  
Less current portion of long-term debt (8,557) $ (896)
Total long-term debt $ 43,217 $ 58,938