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Related party transaction (Details)
9 Months Ended
Sep. 20, 2017
$ / shares
shares
Aug. 07, 2017
EUR (€)
Sep. 30, 2017
$ / shares
shares
Related Party Transaction [Line Items]      
Base salary | €   € 200,000  
Holiday allowance, as a percent   8.00%  
Maximum bonus, as a percent   40.00%  
Share options | 2014 Plan      
Related Party Transaction [Line Items]      
Granted (in shares) | shares 150,000   949,350
Granted (in dollars per share) | $ / shares $ 8.49   $ 6.17