Net loss per common share (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Loss Per Common Share Details
Stock options	$ 480,000	$ 480,000
Warrants	116,735,091	82,587,408
Convertible notes	78,944,078	43,916,472
Total	$ 196,159,169	$ 126,983,880