Consolidated Statements of Operations - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
License and contract	$ 44,723,827	$ 0	$ 12,951,730
OPERATING EXPENSES:
Research and development	45,683,174	43,071,051	24,560,233
General and administrative	9,610,147	6,179,084	5,677,654
Total operating expenses	55,293,321	49,250,135	30,237,887
Loss from operations	(10,569,494)	(49,250,135)	(17,286,157)
OTHER INCOME (EXPENSE):
Investment income	26,270	50,226	35,439
Interest expense	(2,288,309)	(2,513,027)	(661,697)
Foreign exchange transaction loss	0	0	(284,656)
Total other expense, net	(2,262,039)	(2,462,801)	(910,914)
Loss before income taxes	(12,831,533)	(51,712,936)	(18,197,071)
Income tax (expense) benefit	(500,000)	0	531,508
NET LOSS	$ (13,331,533)	$ (51,712,936)	$ (17,665,563)
Basic and diluted net loss per common share	$ (0.07)	$ (0.33)	$ (0.15)
Weighted average number of common shares outstanding used in computing basic and diluted net loss per common share	184,087,719	156,553,534	121,014,506