16. Stockholders' deficit - Warrants Outstanding (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Options
Beginning balance, warrants	19,637,409
Beginning balance, warrants exercise price	$ 0.03
Warrants Granted, shares	2,366,666
Warrants granted, price	$ 0.03
Warrant Exercised, shares	0
Ending Balance, warrants	22,004,075	19,637,409
Ending Balance, warrants exercise price	$ 0.03	$ 0.03
Warrants
Beginning balance, warrants	19,637,409	6,300,000
Beginning balance, warrants exercise price	$ 0.03	$ 0.03
Warrants Granted, shares		19,337,409
Warrants granted, price		$ 0.03
Warrant Exercised, shares		(6,000,000)
Warrants Exercised, price		$ 0.15
Ending Balance, warrants		19,637,409
Ending Balance, warrants exercise price		$ 0.03