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Subsequent events (Details Textual) - Pre-funded Warrants [Member] - July 2017 Public Offering [Member] - shares
1 Months Ended
Oct. 16, 2017
Jul. 18, 2017
Jul. 31, 2017
Subsequent Event [Line Items]      
Warrants exercised   4,000,000 4,000,000
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Warrants exercised 6,835,805