Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Jan. 31, 2021	Jan. 31, 2020
Numerator
Net loss		$ (45,960)	$ (40,151)
Preferred dividends — Series B		(800)	(931)
Net loss attributable to common stockholders		$ (46,760)	$ (41,082)
Denominator
Weighted average basic common shares		312,109,888	202,216,493
Effect of dilutive securities	[1]	0	0
Weighted average diluted common shares		312,109,888	202,216,493
Basic loss per share		$ (0.15)	$ (0.20)
Diluted loss per share	[1]	$ (0.15)	$ (0.20)
Series B Preferred Stock [Member]
Numerator
Preferred dividends — Series B		$ (800)	$ (931)

[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.