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EarningsPer Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Numerator                      
Net loss $ (9,979) $ (17,001) $ (13,238) $ (13,685) $ (12,948) $ (11,067) $ (15,414) $ (11,779) $ (53,903) $ (51,208) $ (29,684)
Net loss attributable to noncontrolling interest                 0 251 325
Preferred stock dividends (800) (800) (800) (800) (800) (800) (800) (800) (3,200) (3,200) (3,200)
Net loss to common stockholders $ (10,779) $ (17,801) $ (14,038) $ (14,485) $ (13,662) $ (11,810) $ (16,173) $ (12,512) $ (57,103) $ (54,157) $ (32,559)
Denominator                      
Weighted average basic common shares                 49,914,904 29,773,700 24,513,731
Effect of dilutive securities [1]                 0 0 0
Weighted average diluted common shares                 49,914,904 29,773,700 24,513,731
Basic loss per share                 $ (1.14) $ (1.82) $ (1.33)
Diluted loss per share [1]                 $ (1.14) $ (1.82) $ (1.33)
[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. As of October 31, 2017, 2016 and 2015, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: