Derivative liability - Movement (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivative Liability Details 1
Opening balance	$ 2,859,832
Derivative liability arising from convertible notes	1,085,837	$ 1,826,500
Fair value adjustment to derivative liability	808,951	1,033,332
Total Derivative Liability	$ 4,754,620	$ 2,859,832