Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 9 months ended Jul. 31, 2017 - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Oct. 31, 2016	$ 10,153	$ 3	$ 123,417	$ (128,176)	$ 5,397
Balance, shares at Oct. 31, 2016	7,374,454	2,782,963
Conversion of Series A preferred stock to common stock	$ (976)	$ 1	975
Conversion of Series A preferred stock to common stock, shares	(3,991,487)	761,798
Conversion of Series B preferred stock to common stock	$ (549)		549
Conversion of Series B preferred stock to common stock, shares	(6,512)	108,543
Conversion of Series C preferred stock to common stock	$ (609)		609
Conversion of Series C preferred stock to common stock, shares	(7,798)	146,346
Conversion of Series D preferred stock to common stock	$ (1,517)		1,517
Conversion of Series D preferred stock to common stock, shares	(129,665)	216,106
Issuance of Series E preferred stock for research and development intellectual property	$ 104,693				104,693
Issuance of Series E preferred stock for research and development intellectual property, shares	7,050
Proceeds from option exercises			1,123		1,123
Proceeds from option exercises, shares		231,404
Warrant exchange to common stock			78		78
Warrant exchange to common stock, shares		56,250
Stock-based compensation expense		$ 1	11,813		11,814
Stock-based compensation expense, shares		1,031,000
Shares issued for cash		$ 1	2,277		2,278
Shares issued for cash, shares		759,333
Net loss				(121,221)	(121,221)
Balance at Jul. 31, 2017	$ 111,195	$ 6	$ 142,358	$ (249,397)	$ 4,162
Balance, shares at Jul. 31, 2017	3,246,042	6,093,743