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Fair Value Measurements (Tables)
9 Months Ended
Jul. 31, 2017
Fair Value Disclosures [Abstract]  
Changes in Estimated Fair Value for Level 3 Classified Derivative Warrant Liability

The following table sets forth the changes in the estimated fair value for our Level 3 classified derivative warrant liability (in thousands):

 

    Warrant Liability  
Fair value - October 31, 2016   $ 70  
Change in fair value     8  
Exchanged - January 18, 2017 (see Note 7)     (78 )
Fair value - July 31, 2017   $ -