8.5% Senior Secured Notes (Details) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 14, 2017	Aug. 11, 2017	Jul. 28, 2017	Aug. 31, 2017	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Nov. 30, 2019		Feb. 11, 2019	Jan. 30, 2019	Dec. 28, 2018	Dec. 10, 2018	Jan. 10, 2018	Dec. 29, 2016
Debt Instrument [Line Items]
Interest included in interest expense								$ 73,000
Stock Purchase Agreement
Debt Instrument [Line Items]
Sale of stock, price per share (in dollars per share)			$ 0.20
Sale of stock, number of shares issued (in shares)			115,000,000
Brennan | Stock Purchase Agreement
Debt Instrument [Line Items]
Securities remaining for future issuance (in shares)		12,500,000		12,500,000
Sale of stock, price per share (in dollars per share)		$ 0.40		$ 0.40
Sale of stock, aggregate purchase price		$ 5,000,000.0		$ 5,000,000.0
Sale of stock, number of shares issued (in shares)	3,750,000	8,750,000
8.5% Senior Secured Notes
Debt Instrument [Line Items]
Debt interest rate			8.50%		8.50%	8.50%	8.50%	8.50%	8.50%	[1]
Debt issued		$ 5,000,000.0	$ 30,000,000.0
Debt repurchase amount			$ 24,500,000									$ 1,500,000	$ 4,300,000
Debt repurchased												$ 2,000,000.0	5,700,000
Additional interest rate percentage to be paid to holders who accept interest paid-in-kind interest														3.00%
Senior notes, net					$ 46,491,000		$ 46,491,000		$ 45,675,000	[1]
8.5% Senior Secured Notes | Board of Directors Member
Debt Instrument [Line Items]
Debt repurchase amount													1,500,000
Debt repurchased													$ 2,000,000.0
8.5% Senior Secured Notes | Brennan
Debt Instrument [Line Items]
Debt repurchase amount											$ 967,000
Debt repurchased											$ 725,000
Brennan Notes | Brennan | Stock Purchase Agreement
Debt Instrument [Line Items]
Debt repurchased	$ 1,500,000	$ 3,500,000
15.0% Senior Secured Notes
Debt Instrument [Line Items]
Debt interest rate			15.00%
New Convertible Notes
Debt Instrument [Line Items]
Debt issued			$ 40,000,000.0											$ 70,000,000.0
Paid-in-kind interest payable														26,800,000
Paid-in-kind interest payable in cash														$ 8,200,000
Additional debt issuance									$ 4,000,000.0
Senior Secured Notes | New Senior Secured Notes
Debt Instrument [Line Items]
Percentage of senior debt to be purchased, maximum			100.00%
Senior Secured Notes | 8.5% Senior Secured Notes
Debt Instrument [Line Items]
Debt interest rate					8.50%		8.50%
Debt issued					$ 47,600,000		$ 47,600,000
Debt outstanding principal balance					47,600,000		47,600,000
Senior notes, net					46,500,000		46,500,000
Debt unamortized discount					904,000		904,000
Unamortized debt issuance costs					205,000		205,000
Interest expense debt					1,600,000	$ 1,500,000	4,200,000	$ 4,400,000
Interest included in interest expense					1,300,000	1,300,000	3,300,000	3,800,000
Amortization of debt origination costs					54,000	76,000	156,000	209,000
Amortization of debt discounts					$ 231,000	$ 152,000	$ 660,000	$ 346,000
Senior Secured Notes | 15.0% Senior Secured Notes
Debt Instrument [Line Items]
Debt issued																$ 69,600,000
Senior Secured Notes | 15.0% Senior Secured Notes | Change in control
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			107.50%
Convertible Notes | New Convertible Notes
Debt Instrument [Line Items]
Debt issued			$ 75,800,000
Debt instrument, redemption price, percentage			100.00%
Debt instrument, required percentage pledged to equity interest			65.00%
Debt covenant, percent of equity interests pledged as collateral															65.00%
Debt instrument, required percentage of trustees or holders to declare notes immediately due and payable			25.00%

[1] Derived from audited consolidated financial statements.