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Related party transactions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Nov. 30, 2015
Related Party Transaction [Line Items]            
Proceeds from issuance of convertible promissory notes       $ 6,800,000    
Convertible Promissory Notes            
Related Party Transaction [Line Items]            
Proceeds from issuance of convertible promissory notes       6,800,000    
Preferred stock investors | Convertible Promissory Notes            
Related Party Transaction [Line Items]            
Proceeds from issuance of convertible promissory notes       3,800,000    
License agreement            
Related Party Transaction [Line Items]            
Related party transaction, expenses $ 100,000 $ 100,000 $ 200,000 200,000    
Due to related party 0   0   $ 0  
Broadband services agreement            
Related Party Transaction [Line Items]            
Related party transaction, expenses $ 100,000 $ 100,000 $ 200,000 $ 200,000    
Monthly cash fee payment           $ 20,000