Net income (loss) per common share - Basic and Diluted Earnings (Details) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Loss Per Common Share Details
Stock options	$ 480,000	$ 480,000
Warrants to purchase shares of common stock	86,337,408	22,004,075
Convertible notes	68,861,363	3,101,093
Total	$ 155,678,771	$ 25,585,168