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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, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Numerator        
Net loss $ (13,174) $ (13,238) $ (17,357) $ (26,923)
Net loss attributable to common stockholders $ (18,173) $ (14,038) $ (26,619) $ (28,523)
Denominator        
Weighted average basic common shares 79,563,265 42,568,818 75,731,565 40,049,948
Effect of dilutive securities [1] 0 0 0 0
Weighted average diluted common shares 79,563,265 42,568,818 75,731,565 40,049,948
Basic loss per share $ (0.23) $ (0.33) $ (0.35) $ (0.71)
Diluted loss per share [1] $ (0.23) $ (0.33) $ (0.35) $ (0.71)
Series C Preferred Stock [Member]        
Numerator        
Series C preferred stock deemed dividends $ (4,199) $ 0 $ (7,662) $ 0
Series B Preferred Stock [Member]        
Numerator        
Series B preferred stock dividends $ (800) $ (800) $ (1,600) $ (1,600)
[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 April 30, 2018 and 2017, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: