Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Jan. 31, 2018	Jan. 31, 2017
Numerator
Net loss		$ (4,183)	$ (13,685)
Net loss attributable to common stockholders		$ (8,446)	$ (14,485)
Denominator
Weighted average basic common shares		72,024,811	37,613,216
Effect of dilutive securities	[1]	0	0
Weighted average diluted common shares		72,024,811	37,613,216
Basic loss per share		$ (0.12)	$ (0.39)
Diluted loss per share	[1]	$ (0.12)	$ (0.39)
Series C Preferred Stock [Member]
Numerator
Series C preferred stock deemed dividends		$ (3,463)	$ 0
Series B Preferred Stock [Member]
Numerator
Series B preferred stock dividends		$ (800)	$ (800)

[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 antidilutive. As of January 31, 2018 and 2017, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: