Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015		Oct. 31, 2014		Oct. 31, 2013
Numerator [Abstract]
Net loss		$ (12,948)	$ (11,067)	$ (15,414)	$ (11,779)	$ (8,905)	$ (6,628)	$ (9,997)	$ (4,154)	$ (51,208)	$ (29,684)		$ (38,883)		$ (38,883)
Net Income (Loss) Attributable to Noncontrolling Interest										251	325		758
Dividends, Preferred Stock		(800)	(800)	(800)	(800)	(800)	(800)	(800)	(800)	(3,200)	(3,200)		(3,200)
Net loss to common shareholders		$ (13,662)	$ (11,810)	$ (16,173)	$ (12,512)	$ (9,660)	$ (7,339)	$ (10,694)	$ (4,866)	$ (54,157)	$ (32,559)		$ (41,325)
Demoninator [Abstract]
Weighted Average Number of Shares Outstanding, Basic										29,773,700	24,513,731		20,473,915
Weighted Average Number Diluted Shares Outstanding Adjustment	[1]									0	0		0
Weighted Average Number of Shares Outstanding, Diluted										29,773,700	24,513,731		20,473,915
Earnings Per Share, Basic										$ (1.82)	$ (1.33)		$ (2.02)
Earnings Per Share, Diluted										$ (1.82)	$ (1.33)	[1]	$ (2.02)	[1]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		14,331,463				1,666,461				14,331,463	1,666,461
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		990,035				483,570				990,035	483,570
Shares of Common Stock Issued upon Conversion	[2]	454,043				454,043				454,043	454,043
Series 1 Preferred Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares of Common Stock Issued upon Conversion	[2]	1,042,000				337,200				1,042,000	337,200
Series A Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		7,680,000				0				7,680,000	0
Series B Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		3,826,000				0				3,826,000	0
NRG Energy, Inc. [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		166,666				166,666				166,666	166,666
Option on Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		246,923				257,769				246,923	257,769
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		915,831				450,783				915,831	450,783

[1] Due to the net loss to common shareholders in each of the years presented above, diluted earnings per share was computed without consideration to potentially dilutive instruments as their inclusion would have been antidilutive. At October 31, 2016 and 2015, potentially dilutive securities excluded from the diluted loss per share calculation are as follows: October 31, 2016 October 31, 2015July 2016 Offering - Series A Warrants7,680,000 —July 2016 Offering - Series B Warrants3,826,000 —July 2014 Offering - NRG Warrants166,666 166,666Outstanding options to purchase common stock246,923 257,769Unvested RSAs915,831 450,7835% Series B Cumulative Convertible Preferred Stock (2)454,043 454,043Series 1 Preferred Shares to satisfy conversion requirements (2)1,042,000 337,200 Total potentially dilutive securities14,331,463 1,666,461(2)Refer to Note 12, Redeemable Preferred Stock, for information on the calculation of the common shares upon conversion.

[2] Refer to Note 12, Redeemable Preferred Stock, for information on the calculation of the common shares upon conversion.