Fair Value (Tables)

12 Months Ended

Oct. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value Assumptions of Warrants and Embedded Conversion Feature

	Common Warrants						Series F Conversion Feature
	September 20, 2017			October 31, 2017			September 20, 2017			October 31, 2017
Stock price	$	25.69		$	25.87		$	25.69		$	25.87
Exercise price	$	30.00		$	30.00		$	27.50		$	27.50
Risk-free rate		1.450	%		1.581	%		1.450	%		1.581	%
Volatility		94.9	%		96.0	%		94.9	%		96.0	%
Term		2.00			1.89			2.00			1.89

Schedule of Fair Value of Financial Instruments Measured on Recurring Basis

The fair value hierarchy of financial instruments, measured at fair value on a recurring basis on the consolidated balance sheets as of October 31, 2017 and 2016 is as follows (in thousands):

	Fair Value Measurement as of October 31, 2017
	Level 1		Level 2		Level 3		Total
Liabilities
Warrant liability	$	-	$	-	$	4,256	$	4,256
Derivative liability		-		-		9,246		9,246
Total	$	-	$	-	$	13,502	$	13,502

	Fair Value Measurement as of October 31, 2016
	Level 1		Level 2		Level 3		Total
Liabilities
Warrant liability	$	-	$	-	$	70	$	70
Total	$	-	$	-	$	70	$	70

Schedule of 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):

	2016 Common Stock Offering Warrant Liability			2017 Series F Preferred Stock - Warrant Liability			2017 Series F Preferred Stock - Embedded Derivative			Total Warrant and Derivative Liability
Fair value – November 1, 2015	$	-		$	-		$	-		$	-
Additions		318			-			-			318
Change in fair value		(248	)		-			-			(248	)
Fair value – October 31, 2016		70			-			-			70
Exchanged - January 18, 2017 (see Note 8)		(78	)		-			-			(78	)
Additions		-			4,300			9,319			13,619
Change in fair value		8			(44	)		(73	)		(109	)
Fair value – October 31, 2017	$	-		$	4,256		$	9,246		$	13,502