Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2019	Jul. 31, 2018
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	154,810,655	79,007,423
Common stock, shares outstanding	154,810,655	79,007,423
Series B Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	100	100
Preferred stock, shares issued	100	100
Preferred stock, shares outstanding	100	100
Preferred stock, liquidation preference	$ 10	$ 10
Series C Convertible Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	0	62,048
Preferred stock, shares issued	0	62,048
Preferred stock, shares outstanding	0	62,048
Preferred stock, liquidation preference		$ 62
Series D Convertible Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	0	5,500
Preferred stock, shares issued	0	2,782
Preferred stock, shares outstanding	0	2,782
Preferred stock, liquidation preference		$ 4,173