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Shareholders’ equity (Details) - USD ($)
$ in Millions
Sep. 15, 2017
Sep. 30, 2017
Dec. 31, 2016
Shareholders’ equity      
Shares authorized under the sales agreement with Leerink 5,000,000 60,000,000 60,000,000
Commission fee based on gross proceeds of shares sold 3.00%    
Expenses capitalized related to offering $ 0.4