Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Millions				1 Months Ended	3 Months Ended									9 Months Ended				12 Months Ended
	May 15, 2019 USD ($)	Feb. 21, 2019 USD ($) TradingDay $ / shares	Aug. 29, 2018 USD ($) shares	Jul. 03, 2019 $ / shares shares	Jul. 31, 2019 USD ($) $ / shares shares	Jul. 31, 2019 CAD ($) shares	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 CAD ($)	Jul. 31, 2018 USD ($) $ / shares	Jul. 31, 2018 CAD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) TradingDay $ / shares shares	Jul. 31, 2019 CAD ($) TradingDay shares	Jul. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2018 CAD ($) shares	Oct. 31, 2017 $ / shares shares	Jul. 31, 2019 CAD ($) shares	May 23, 2019 $ / shares shares	May 22, 2019 $ / shares	May 08, 2019 shares	Jan. 02, 2019 $ / shares	Dec. 17, 2018 $ / shares	Dec. 03, 2018 $ / shares	Oct. 31, 2018 USD ($) $ / shares shares	Oct. 31, 2018 CAD ($) shares	Aug. 27, 2018 $ / shares shares	Aug. 26, 2018 $ / shares
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares					250,000									250,000					250,000			250,000
Preferred stock, par value | $ / shares					$ 0.01									$ 0.01
Dividends declared							$ 800,000	$ 800,000		$ 800,000		$ 800,000	$ 800,000
Waiver Agreement [Member]
Class Of Stock [Line Items]
Decrease in net loss attributable to common shareholders							500,000
Installment and Optional Conversions, Triggering Event Conversions of Series D Preferred Stock to Common Stock [Member]
Class Of Stock [Line Items]
Conversion of common stock, shares issued | shares					59,021,202	59,021,202								61,947,759	61,947,759
Convertible preferred stock, reduction in carrying amount					$ 20,500,000									$ 31,100,000
Conversion Of Series D Preferred Stock To Common Stock [Member]
Class Of Stock [Line Items]
Conversion of common stock, shares issued | shares				52,702,282
Series B Cumulative Convertible Perpetual Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares					105,875									105,875					105,875							105,875	105,875
Preferred stock, dividend rate, percentage	5.00%													5.00%	5.00%	5.00%	5.00%
Preferred stock sale of shares | shares					64,020									64,020					64,020							64,020	64,020
Preferred stock shares outstanding | shares					64,020									64,020					64,020							64,020	64,020
Temporary equity, carrying amount, attributable to parent					$ 59,857,000									$ 59,857,000												$ 59,857,000
Preferred stock, liquidation preference per share | $ / shares					$ 1,000.00									$ 1,000.00												$ 1,000.00
Dividends, preferred stock, cash					$ 0					800,000				$ 1,600,000		$ 2,400,000
Dividends declared	$ 0				810,000					$ 800,000				2,410,000		$ 2,400,000
Dividends payment date	May 15, 2019
Aggregate amount of dividend payment	$ 800,000
Preferred stock failed to pay dividend payments multiplier percentage	0.0625%
Dividends payable					$ 810,000									$ 810,000
Series D Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock sale of shares | shares			30,680		25									25					25							30,680	30,680
Conversion of stock conversion price | $ / shares					$ 16.56									$ 16.56
Proceeds from Issuance of preferred stock			$ 25,300,000
Preferred stock shares outstanding | shares					25									25					25							30,680	30,680
Temporary equity, carrying amount, attributable to parent					$ 27,000									$ 27,000												$ 27,392,000
Convertible preferred stock, converted into common stock | shares					18,932	18,932								30,655	30,655
Preferred stock deemed dividends					$ 3,100,000									$ 6,000,000
Preferred stock, redemption accretion value														$ 3,800,000
Number of consecutive trading days | TradingDay														5	5
Series D Preferred Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Conversion of stock conversion price | $ / shares					$ 16.56									$ 16.56
Reduced conversion price | $ / shares				$ 0.61
Series D Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Preferred stock, conversion basis, stock issuance, threshold percentage of outstanding voting stock														20.00%	20.00%
Reduced conversion price | $ / shares				$ 0.14
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member]
Class Of Stock [Line Items]
Percentage of lowest volume weighted average price of common stock considered as conversion price														85.00%	85.00%
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member] | Minimum [Member]
Class Of Stock [Line Items]
Conversion terms, prior receiving beneficial ownership, percentage														20.00%	20.00%
Series D Preferred Stock [Member] | Convertible Preferred Offering [Member] | Oppenheimer & Co [Member]
Class Of Stock [Line Items]
Preferred stock, par value | $ / shares																												$ 0.01
Preferred stock sale of shares | shares																												30,680
Preferred stock, initial convertibel shares | shares																												1,852,657
Conversion of stock conversion price | $ / shares																												$ 16.56
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Conversion of stock conversion price | $ / shares										$ 22.08						$ 22.08												$ 18.00	$ 22.08
Preferred stock shares outstanding | shares																				0
Temporary equity, carrying amount, attributable to parent																										$ 7,480,000
Convertible preferred stock, converted into common stock | shares					1,618	1,618										8,992	8,992
Convertible preferred stock, reduction in carrying amount					$ 3,200,000											$ 15,500,000
Preferred stock deemed dividends					$ 900,000									$ 1,500,000
Adjusted conversion price | $ / shares																							$ 5.16	$ 6.00	$ 6.96
Convertible preferred stock, converted into number of common stock shares | shares					1,658,861	1,658,861										3,914,218	3,914,218
Series C Preferred Stock [Member] | Waiver Agreement [Member]
Class Of Stock [Line Items]
Temporary equity, carrying amount, attributable to parent		$ 13,500,000
Percentage of lowest volume weighted average price of common stock considered as conversion price		85.00%
Number of consecutive trading days | TradingDay		20
Percentage of shares will receive upon conversion prior to execution of waiver agreement		25.00%
Conversion right description														Under the Waiver Agreement, the conversion price of the Series C Preferred Stock is stated to be the lowest of (i) $4.45, (ii) 85% of the lowest closing bid price of the Company’s common stock during the period beginning on and including the fifth trading day prior to the date on which the applicable conversion notice is delivered to the Company and ending on and including the date on which the applicable conversion notice is delivered to the Company, and (iii) 85% of the quotient of (A) the sum of the five lowest VWAPs of the Company’s common stock during the twenty consecutive trading day period ending and including the trading day immediately preceding the applicable conversion date divided by (B) five.	Under the Waiver Agreement, the conversion price of the Series C Preferred Stock is stated to be the lowest of (i) $4.45, (ii) 85% of the lowest closing bid price of the Company’s common stock during the period beginning on and including the fifth trading day prior to the date on which the applicable conversion notice is delivered to the Company and ending on and including the date on which the applicable conversion notice is delivered to the Company, and (iii) 85% of the quotient of (A) the sum of the five lowest VWAPs of the Company’s common stock during the twenty consecutive trading day period ending and including the trading day immediately preceding the applicable conversion date divided by (B) five.
Conversion price of preferred stock | $ / shares		$ 4.45
Percentage of conversion price of common stock		125.00%
Convertible preferred stock embedded conversion amount							$ 6,600,000
Change in fair value of convertible preferred stock		$ (500,000)
Percentage of stated redemption value adjustment														108.00%	108.00%
Stated redemption value corresponding charge to common shareholders								$ 8,600,000
Series C Preferred Stock [Member] | Waiver Agreement [Member] | Volatility [Member]
Class Of Stock [Line Items]
Convertible preferred stock, measurement input		75.00%
Series C Preferred Stock [Member] | Waiver Agreement [Member] | Discount Rate [Member]
Class Of Stock [Line Items]
Convertible preferred stock, measurement input		20.00%
Series C Preferred Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Adjusted conversion price | $ / shares																					$ 4.45
Series C Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Adjusted conversion price | $ / shares																				$ 1.27
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member]
Class Of Stock [Line Items]
Preferred stock sale of shares | shares					0									0					0							8,992	8,992
Preferred stock shares outstanding | shares					0									0					0							8,992	8,992
Temporary equity, carrying amount, attributable to parent					$ 0									$ 0												$ 7,500,000
Aggregate number of shares issued | shares																		33,500
Sale of stock price per share | $ / shares																		$ 0.01
Preferred stock, stated value per share | $ / shares																		$ 1,000
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Waiver Agreement [Member]
Class Of Stock [Line Items]
Convertible preferred stock, reduction in carrying amount														$ 6,600,000
Class A Cumulative Redeemable Exchangeable Preferred Shares [Member]
Class Of Stock [Line Items]
Preferred stock shares outstanding | shares					1,000,000									1,000,000					1,000,000
Return of capital and dividend payments									$ 0.3								$ 0.9
Interest expense, other						$ 1.4					$ 0.7				$ 2.2		$ 2.1
Carrying value of preferred shares, total					$ 16,900,000									$ 16,900,000					$ 22.2							$ 15,900,000	$ 20.9