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Long-term debt - Future Principal Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Future principal payments of long-term debt, including capital leases    
2017 $ 4,921  
2019 15,000  
2020 15,000  
2021 15,000  
Thereafter 15,000  
Future principal payments 64,921  
Less unamortized debt discount (1,401)  
Less current portion of long-term debt (4,921) $ (7,973)
Total long-term debt $ 58,599 $ 26,271