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Income taxes - Provision for Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
U.S. Federal $ 0 $ 0 $ 0
U.S. State and Local (6) (2) (2)
Foreign (1,131) (766) (483)
Deferred:      
U.S. Federal (198) 199 0
U.S. State and Local 0 0 0
Foreign 0 0 0
Total tax expense $ (1,335) $ (569) $ (485)