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Revenue recognition - Recognized revenue in the period (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]    
Amounts included in contract liabilities at the beginning of the period $ 0 $ 0
Performance obligations satisfied in previous period 0 0
Performance obligations satisfied in current period 68,170 124,151
Total product revenue $ 68,170 $ 124,151