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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 9 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Numerator                
Net loss $ (11,997) $ (18,917) $ (45,960) $ (15,331) $ (14,769) $ (40,151) $ (76,874) $ (70,251)
Preferred dividends - Series B (800) $ (800) $ (800) (800) $ (800) $ (931)    
Net loss attributable to common stockholders $ (12,797)     $ (16,131)     $ (79,274) $ (72,782)
Denominator                
Weighted average basic common shares 337,291,562     217,966,402     323,983,465 210,389,907
Effect of dilutive securities [1] 0     0     0 0
Weighted average diluted common shares 337,291,562     217,966,402     323,983,465 210,389,907
Basic loss per share $ (0.04)     $ (0.07)     $ (0.24) $ (0.35)
Diluted loss per share [1] $ (0.04)     $ (0.07)     $ (0.24) $ (0.35)
Series B Preferred Stock                
Numerator                
Preferred dividends - Series B $ (800)     $ (800)     $ (2,400) $ (2,531)
[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.