Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Numerator
Net loss		$ (13,238)	$ (15,414)	$ (26,923)	$ (27,193)
Net loss attributable to noncontrolling interest		0	41	0	108
Preferred stock dividends		(800)	(800)	(1,600)	(1,600)
Net loss attributable to common shareholders		$ (14,038)	$ (16,173)	$ (28,523)	$ (28,685)
Denominator
Weighted average basic common shares		42,568,818	28,782,066	40,049,948	27,500,236
Effect of dilutive securities	[1]	0	0	0	0
Weighted average diluted common shares		42,568,818	28,782,066	40,049,948	27,500,236
Basic loss per share		$ (0.33)	$ (0.56)	$ (0.71)	$ (1.04)
Diluted loss per share	[1]	$ (0.33)	$ (0.56)	$ (0.71)	$ (1.04)

[1] Due to the net loss to common shareholders 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 April 30, 2017 and 2016, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: