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Stockholders' deficit - Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Ending Balance, warrants 2,566,101,248  
Ending Balance, warrants exercise price $ 0.00451  
Warrants    
Beginning balance, warrants 97,499,908 49,504,075
Warrants Granted, shares 27,700,652 48,295,833
Warrant Adjustment due to price protection, shares 2,456,534,397  
Warrants Cancelled, shares (15,633,709) (300,000)
Warrant Exercised, shares  
Ending Balance, warrants 2,566,101,248 97,499,908
Beginning balance, warrants exercise price $ 0.0910 $ 0.0690
Warrants granted, price 0.11773 0.113
Warrant adjustment due to price protection, shares 0.00204  
Warrants cancelled, price 0.030 0.0033
Warrants Exercised, price
Ending Balance, warrants exercise price 0.00451 0.0910
Minimum [Member]    
Beginning balance, warrants exercise price 0.003 0.0033
Warrants granted, price 0.10 0.10
Ending Balance, warrants exercise price 0.00204 0.003
Maximum [Member]    
Beginning balance, warrants exercise price 0.12 0.10
Warrants granted, price 0.12 0.12
Ending Balance, warrants exercise price $ 0.12 $ 0.12