Stockholders' Deficit - Preferred and Common Stock (Details) - USD ($)					12 Months Ended
	Jul. 31, 2017	May 10, 2017	Feb. 10, 2017	Oct. 11, 2016	Jun. 30, 2017	Feb. 16, 2017	Jun. 30, 2016
Preferred stock, shares outstanding							0
Shares that warrants can purchase				10,000,000
Common stock, par value				$ 3.00	$ 0.01		$ 0.01
Gross proceeds from sale of common stock				$ 30,000,000
Net proceeds from sale of common stock				$ 28,600,000	$ 14,700,000
Exercise price of warrant				$ 3.75
Convertible preferred stock
Preferred stock, shares issued					1,000,000		0
Preferred stock, shares outstanding					1,000,000		0
Securities Purchase Agreement | Seattle Genetics, Inc., (“SGEN”)
Agreement purchase shares of common stock	3,000,000		3,000,000
Shares that warrants can purchase	8,655,804		8,655,804
Common stock, par value			$ 4.90
Gross proceeds from sale of common stock			$ 14,700,000
Fair value of warrants				$ 7,300,000		$ 22,300,000
Warrants term			3 years
Private placement | Convertible preferred stock
Preferred stock, shares issued		1,000,000
Share price (in dollars per share)		$ 125
Gross proceeds		$ 125
Conversion ratio		23.10536
Conversion of shares	23,105,348	23,105,348
Average stock price		$ 5.41
Agreement purchase shares of common stock	3,000,000
Shares that warrants can purchase	8,655,804