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Long-term debt - Future Principal Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Future principal payments of long-term debt, including capital leases    
2016 $ 7,973  
2017 27,438  
Future principal payments, including capital leases 35,411  
Less unamortized debt discount (1,167)  
Less current portion of long-term debt (7,973) $ (1,653)
Long-term debt, net of current portion $ 26,271 $ 23,121