Stockholders' Equity (Deficit) (Details) - USD ($)								3 Months Ended		9 Months Ended
	Jan. 08, 2018	Jan. 07, 2018	Dec. 05, 2017	Jul. 31, 2017	Jun. 30, 2017	May 10, 2017	Oct. 11, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Feb. 22, 2018	Dec. 14, 2017	Sep. 01, 2017	Jul. 18, 2017	Jun. 29, 2017
Total shares authorized																260,000,000
Common stock, shares authorized					250,000,000			250,000,000		250,000,000						250,000,000
Preferred stock, shares authorized																10,000,000
Common stock, par value					$ 0.01		$ 3.00	$ 0.01		$ 0.01
Common stock, shares issued					110,344,643			167,255,886		167,255,886
Gross proceeds from sale of common stock							$ 30,000,000
Net proceeds from sale of common stock							$ 28,600,000			$ 123,508,937	$ 43,278,473
Exercise price of warrant								$ 3.75		$ 3.75
Warrants term							9 months
Shares that warrants can purchase							10,000,000
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
Warrant Liability.
Warrants exercised					3,550,000
Warrants outstanding					18,655,804			6,450,000		6,450,000
Warrant Liability. | Level 2
Changes in fair value of warrant liabilities										$ 49,775,000
Convertible preferred stock
Preferred stock, shares authorized					10,000,000			10,000,000		10,000,000
Preferred stock, par value					$ 0.01			$ 0.01		$ 0.01
Preferred stock, shares issued					1,000,000			0		0
Preferred stock, shares outstanding					1,000,000			0		0
Seattle Genetics, Inc., (“SGEN”)
Warrants exercised			8,655,804
Aggregate purchase price			$ 42,400,000
Securities Purchase Agreement | Seattle Genetics, Inc., (“SGEN”)
Fair value of warrants							$ 7,300,000
Funding and Purchase Agreements [Member] | RPI
Collaborative agreement purchase price	$ 175,000,000	$ 175,000,000
Private placement
Common stock, shares issued	4,373,178
Private placement | Convertible preferred stock
Preferred stock, shares issued						1,000,000
Share price (in dollars per share)						$ 125
Gross proceeds						$ 125,000,000
Conversion ratio						23.10536
Conversion of shares				23,105,348		23,105,348
Average stock price						$ 5.41
Private placement | Common stock purchase agreement | RPI
Average stock price	$ 17.15	$ 17.15
Agreement purchase shares of common stock		4,373,178
Gross proceeds from sale of common stock	$ 75,000,000	$ 75,000,000
Over-Allotment Option
Agreement purchase shares of common stock							10,000,000
Previously Reported [Member]
Total shares authorized																165,000,000
Common stock, shares authorized																155,000,000
Preferred stock, shares authorized																10,000,000