Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Jan. 31, 2020	Jan. 31, 2019
Numerator
Net loss		$ (40,151)	$ (17,548)
Preferred dividends — Series B		(931)	(800)
Net loss attributable to common stockholders		$ (41,082)	$ (33,038)
Denominator
Weighted average basic common shares		202,216,493	8,321,702
Effect of dilutive securities	[1]	0	0
Weighted average diluted common shares		202,216,493	8,321,702
Basic loss per share		$ (0.20)	$ (3.97)
Diluted loss per share	[1]	$ (0.20)	$ (3.97)
Series B Preferred Stock [Member]
Numerator
Preferred dividends — Series B		$ (931)	$ (800)
Series C Preferred Stock [Member]
Numerator
Series C preferred stock deemed dividends and redemption value adjustment		0	(9,005)
Series D Preferred Stock [Member]
Numerator
Preferred stock deemed dividends and redemption accretion		$ 0	$ (5,685)

[1] Due to the net loss to common stockholders in each of the periods presented above, diluted loss per share was computed without consideration to potentially dilutive instruments as their inclusion would have been anti-dilutive.