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Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 15, 2019 | May 15, 2019 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  | $ (35,179,000) | $ (5,311,000) | $ (19,530,000) | $ (17,548,000) | $ (14,096,000) | $ (15,881,000) | $ (13,174,000) | $ (4,183,000) | $ (77,568,000) | $ (47,334,000) | $ (53,903,000)
Series B Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  | (3,231,000) | (3,200,000) | (3,200,000)
Net loss attributable to common stockholders |  |  |  | (36,003,000) | (8,328,000) | (22,876,000) | (33,038,000) | (17,929,000) | (17,620,000) | (18,173,000) | (8,446,000) | $ (100,245,000) | $ (62,168,000) | $ (57,103,000)
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic |  |  |  |  |  |  |  |  |  |  |  | 55,081,266 | 6,896,189 | 4,159,575
Effect of dilutive securities | [1] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Weighted average common shares outstanding - diluted |  |  |  |  |  |  |  |  |  |  |  | 55,081,266 | 6,896,189 | 4,159,575
Net loss to common stockholders per share - basic |  |  |  |  |  |  |  |  |  |  |  | $ (1.82) | $ (9.01) | $ (13.73)
Net loss to common stockholders per share - diluted | [1] |  |  |  |  |  |  |  |  |  |  | $ (1.82) | $ (9.01) | $ (13.73)
Series A Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A warrant exchange |  |  |  |  |  | (3,169,000) |  |  |  |  |  | $ (3,169,000) |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock deemed dividends and redemption value adjustments, net |  |  |  |  |  |  |  |  |  |  |  | (6,522,000) | $ (9,559,000) |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred stock dividends |  | $ 0 | $ 0 | (821,000) | (810,000) | (800,000) | (800,000) | (800,000) | $ (800,000) | $ (800,000) | $ (800,000) | (3,231,000) | (3,200,000) | $ (3,200,000)
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock deemed dividends and redemption accretion |  |  |  | $ (3,000) | $ (3,091,000) | $ (976,000) | $ (5,685,000) | $ (2,075,000) |  |  |  | $ (9,755,000) | $ (2,075,000) | $ 0
[1] | Due to the net loss to common stockholders in each of the years presented above, diluted earnings per share was computed without consideration to potentially dilutive instruments as their inclusion would have been antidilutive.

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