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Related party transactions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Founders and initial investors | Royalty Agreements        
Related party transactions        
Royalties earned     $ 0  
Royalties paid     0  
Chairman of Board of Directors | Consultancy services with 10X Capital Inc.        
Related party transactions        
Amount of transaction $ 0 $ 25,000 $ 50,000 $ 100,000