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Revenue recognition - Narrative (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 - Licensing And Collaboration Agreement
$ in Millions
Nov. 30, 2011
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 30.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years