Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Oct. 31, 2015	$ 10,694	$ 2	$ 128,497	$ (123,536)	$ 15,657
Balance, shares at Oct. 31, 2015	9,025,265	1,851,503
Issuance of common stock in connection with: Restricted stock grants		$ 1	(1)
Issuance of common stock in connection with: Restricted stock grants, shares		356,666
Conversion of Series A preferred stock to common stock	$ (401)		401
Conversion of Series A preferred stock to common stock, shares	(1,638,810)	273,135
Conversion of Series D preferred stock to common stock	$ (140)		140
Conversion of Series D preferred stock to common stock, shares	(12,001)	20,002
Proceeds from stock option exercise			129		129
Proceeds from stock option exercise, shares		31,657
Stock-based compensation expense			3,142		3,142
Stock-based compensation expense, shares
Shares issued for cash			1,406		1,406
Shares issued for cash, shares		250,000
Warrant liability			(318)		(318)
Allocation of warrant offering cost			21		21
Special cash dividend			(10,000)		(10,000)
Warrants exchanged for common stock
Deemed dividend - accretion of discount on Series F preferred stock
Cumulative dividends on Series F preferred stock
Net loss				(4,640)	(4,640)
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 D preferred stock to common stock	$ (1,517)		1,517
Conversion of Series D preferred stock to common stock, shares	(129,665)	216,106
Proceeds from stock option exercise			1,301		1,301
Proceeds from stock option exercise, shares		268,847
Stock-based compensation expense		$ 1	17,774		17,745
Stock-based compensation expense, shares		1,057,500
Common stock issued for cash		$ 1	2,277		2,278
Common stock issued for cash, shares		759,333
Warrant liability					3,845
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	$ (1,809)	$ 1	1,808
Conversion of Series C preferred stock to common stock, shares	(23,185)	504,184
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
Warrants exchanged for common stock			78		78
Warrants exchanged for common stock, shares		56,250
Deemed dividend - accretion of discount on Series F preferred stock			(369)		(369)
Cumulative dividends on Series F preferred stock			(124)		(124)
Net loss				(130,829)	(130,829)
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