Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 3 months ended Jan. 31, 2018 - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Oct. 31, 2017	$ 109,995	$ 7	$ 149,173	$ (259,005)	$ 170
Balance, shares at Oct. 31, 2017	3,230,655	6,515,524
Conversion of Series A preferred stock to common stock	$ (378)		378
Conversion of Series A preferred stock to common stock, shares	(1,544,572)	350,000
Conversion of Series C preferred stock to common stock	$ (201)		201
Conversion of Series C preferred stock to common stock, shares	(2,578)	59,950
Conversion of Series D preferred stock to common stock	$ (312)		312
Conversion of Series D preferred stock to common stock, shares	(26,667)	44,445
Proceeds from option exercises			45		45
Proceeds from stock exercises, shares		10,417
Stock-based compensation expense			11,132		11,132
Stock-based compensation expense, shares		102,500
Deemed dividend - accretion of discount on Series F preferred stock			(904)		(904)
Cumulative dividends on Series F preferred stock			(275)		(275)
Series F preferred stock dividends paid in common stock			306		306
Series F preferred stock dividends paid in common stock, shares		11,708
Net loss				(14,089)	(14,089)
Balance at Jan. 31, 2018	$ 109,104	$ 7	$ 160,368	$ (273,094)	$ (3,615)
Balance, shares at Jan. 31, 2018	1,656,838	7,094,544