Stockholders' deficit (Detail Textuals) - USD ($)		3 Months Ended								12 Months Ended
	Jul. 31, 2017	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018
Stockholders Equity Note [Line Items]
Issuance of common stock for cash										$ 1,678,000	$ 16,362,000
Issuance of common stock for cash (in shares)										1,707,000	30,303,000
Net of common stock issuance costs											$ 2,082,000
Value of common stock issued for services										$ 137,000
Stock issued for services (in shares)										265,000
Conversion of notes payable to common stock										$ 232,000	$ 311,000
Conversion of notes payable to common stock (in shares)										1,449,000	2,768,000
Value of discount issued in connection with notes payable			$ 27,000							$ 27,000
Stock subscriptions receivable						$ 300,000
Accrued interest						$ 132,000					$ 132,000
Legal settlement									$ 144,000
Legal settlement (in shares)											144,000
Proceeds from issuance of common stock, net of issuance costs										$ 1,977,994	$ 16,362,509
Extinguishment of derivative liability									$ 780,010		780,000
Marketing and other services
Stockholders Equity Note [Line Items]
Value of common stock issued for services											$ 1,161,000
Stock issued for services (in shares)											502,000
Nicholas Yates
Stockholders Equity Note [Line Items]
Issuance of common stock for cash	$ 200,000
Issuance of common stock for cash (in shares)	150,000
Proceeds from issuance of common stock, net of issuance costs											$ 200,000
2013 Equity Incentive Plan
Stockholders Equity Note [Line Items]
Number of common stock for cashless exercise										622,000	628,000
Stock-based compensation										$ 2,947,000	$ 1,636,000
Common Stock
Stockholders Equity Note [Line Items]
Stock issued for services (in shares)		112,500	50,000	50,000	52,155	502,415
Number of common stock for cashless exercise				178,809	442,870	56,674	436,425	70,761	64,117
Stock subscriptions receivable						$ 200					$ 300,000
Stock subscriptions receivable (in shares)						200,000					200,000
Legal settlement									$ 150
Legal settlement (in shares)									150,000		150,000