Fair Value - Changes in Estimated Fair Value for Level 3 Classified Derivative Warrant Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Fair value at the beginning of period	$ 70
Additions	13,619	318
Change in fair value	(109)	(248)
Exchanged - January 18, 2017 (see Note 8)	(78)
Fair value at the end of period	13,502	70
2016 Common Stock Offering Warrant Liability [Member]
Fair value at the beginning of period	70
Additions		318
Change in fair value	8	(248)
Exchanged - January 18, 2017 (see Note 8)	(78)
Fair value at the end of period		70
2017 Series F Preferred Stock Warrant Liability [Member]
Fair value at the beginning of period
Additions	4,300
Change in fair value	(44)
Exchanged - January 18, 2017 (see Note 8)
Fair value at the end of period	4,256
2017 Series F Preferred Stock Embedded Derivative [Member]
Fair value at the beginning of period
Additions	9,319
Change in fair value	(73)
Exchanged - January 18, 2017 (see Note 8)
Fair value at the end of period	$ 9,246