Warrant Liabilities (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017	Feb. 22, 2018	Dec. 14, 2017	Dec. 05, 2017	Sep. 01, 2017	Jul. 18, 2017
Fair value assumptions for warrants
Warrants exercised							140,000	575,000		675,000	900,000
Changes in fair value of warrant liabilities	$ 14,600,000	$ (9,835,441)	$ 28,336,865	$ 49,774,638	$ 35,567,205
Reclass of warrant liability to capital contributed in excess of par				70,149,633
Warrant liabilities	$ 90,706,206	$ 70,331,191		$ 70,331,191		$ 90,706,206
Warrant Liability.
Fair value assumptions for warrants
Warrants exercised	3,550,000					3,550,000
Warrants outstanding	18,655,804	6,450,000		6,450,000		18,655,804
Warrant Liability. | Level 2
Fair value assumptions for warrants
Changes in fair value of warrant liabilities				$ 49,775,000
Reclass of warrant liability to capital contributed in excess of par				70,150,000
Warrant one
Fair value assumptions for warrants
Warrants exercised										675,000	900,000
Changes in fair value of warrant liabilities						$ 2,600,000
Reclass of warrant liability to capital contributed in excess of par				11,200,000
Warrant two
Fair value assumptions for warrants
Warrants exercised								575,000	575,000
Changes in fair value of warrant liabilities						2,200,000
Reclass of warrant liability to capital contributed in excess of par				41,100,000
Warrant three
Fair value assumptions for warrants
Warrants exercised							1,400,000
Changes in fair value of warrant liabilities						$ 10,100,000
Reclass of warrant liability to capital contributed in excess of par				$ 17,800,000
Seattle Genetics, Inc., (“SGEN”)
Fair value assumptions for warrants
Warrants exercised									8,655,804
Seattle Genetics, Inc., (“SGEN”) | Warrant two
Fair value assumptions for warrants
Warrants exercised								8,655,804