Stockholders' deficit - warrants Outstanding (Details)	Dec. 31, 2018 $ / shares shares
No. of shares, Warrants outstanding	97,499,908
Weighted average remaining years, Warrants outstanding	2 years 12 months 19 days
Weighted average exercise price, Warrants outstanding | $ / shares	$ 0.091
Weighted average exercise price, Warrants exercisable | $ / shares	$ 0.091
Excercise 0.03 [Member]
No. of shares, Warrants outstanding	21,704,075
Weighted average remaining years, Warrants outstanding	1 year 2 months 12 days
No. of shares, Warrants exercisable	21,704,075
Excercise 0.10 [Member]
No. of shares, Warrants outstanding	44,483,333
Weighted average remaining years, Warrants outstanding	4 years 1 month 6 days
No. of shares, Warrants exercisable	44,483,333
Excercise 0.12 [Member]
No. of shares, Warrants outstanding	31,312,500
Weighted average remaining years, Warrants outstanding	2 years 7 months 6 days
No. of shares, Warrants exercisable	31,312,500