Convertible Instruments - Additional Information (Detail)

v3.20.2

Convertible Instruments - Additional Information (Detail)										1 Months Ended			3 Months Ended				12 Months Ended
	Jul. 30, 2020 USD ($)	Jul. 29, 2020 USD ($)	Jul. 27, 2020 USD ($) $ / shares shares	Mar. 13, 2020 USD ($) $ / shares	Jan. 28, 2020 USD ($) $ / shares shares	Dec. 16, 2019 USD ($)	Aug. 29, 2019 USD ($) shares	Mar. 20, 2019 USD ($) $ / shares shares	Jun. 26, 2018 USD ($) $ / shares	Apr. 16, 2019 USD ($)	Jan. 30, 2019 USD ($)	Nov. 15, 2018 USD ($)	Aug. 31, 2020 USD ($) $ / shares shares	May 31, 2020 USD ($) $ / shares shares	Nov. 30, 2019 USD ($) $ / shares shares	Aug. 31, 2019 USD ($) shares	May 31, 2020 USD ($) $ / shares shares	May 31, 2010 USD ($)	Jul. 31, 2020 USD ($)	Jul. 24, 2020 shares	Jun. 29, 2020 shares	Apr. 03, 2020 shares	Feb. 12, 2020 shares	Oct. 11, 2019 shares	Sep. 30, 2019 USD ($)	Apr. 30, 2010 shares
Class of Stock [Line Items]
Number of common shares issued upon conversion of preferred stock | shares																100,000
Common stock, shares authorized | shares													800,000,000	800,000,000			800,000,000
Convertible preferred stock, par value | $ / shares													$ 0.001	$ 0.001			$ 0.001
Convertible note, aggregate principal													$ 15,000,000
Convertible notes, interest rate													5.00%
Exercise price of warrants, per share | $ / shares															$ 0.45
Unamortized discount													$ 1,700,000
Amortization of debt discount													1,339,000			$ 1,030,000
Proceeds from convertible promissory note											$ 5,000,000
Common stock conversion price | $ / shares									$ 0.55						$ 0.50
Convertible promissory note maximum redemption amount													950,000
Terms of conversion									1.5
Convertible note, redeemed amount													4,476,000
Outstanding balance of convertible note including accrued unpaid interest			$ 9,537,500
Accrued dividends													$ 1,401,000	$ 981,000			$ 981,000
Preferred stock, shares authorized | shares													5,000,000	5,000,000			5,000,000
Common Stock, Shares, Issued | shares													570,325,000	519,261,000			519,261,000				4,000,000
Interest paid													$ 11,000			10,000
Conversion Of Debt Into Equity [Member]
Class of Stock [Line Items]
Amortization of debt discount													$ 300,000	$ 200,000
Interest Rate Payable On Default [Member]
Class of Stock [Line Items]
Convertible notes, interest rate													22.00%
Maximum
Class of Stock [Line Items]
Preferred stock, shares authorized | shares													5,000,000
Default Percentage One [Member]
Class of Stock [Line Items]
Debt instrument percentage increase on principal payable on default													15.00%
Debt Instrument Percentage Increase On Principal Payable In The Event Of Defaul													15.00%
Default Percentage Two [Member]
Class of Stock [Line Items]
Debt instrument percentage increase on principal payable on default													10.00%
Debt Instrument Percentage Increase On Principal Payable In The Event Of Defaul													10.00%
Default Percentage Three [Member]
Class of Stock [Line Items]
Debt instrument percentage increase on principal payable on default													5.00%
Debt Instrument Percentage Increase On Principal Payable In The Event Of Defaul													5.00%
Investor Warrants
Class of Stock [Line Items]
Common stock warrants to purchase shares | shares																							2,500,000
Conversion of Preferred Stock to Common Stock
Class of Stock [Line Items]
Undeclared dividend													$ 2,000			200,000
Accrued dividend													4,000			432,000
Note
Class of Stock [Line Items]
Convertible notes, interest rate									10.00%
Unamortized discount		$ 100,000
Number of shares to be sold | shares																	8,512,622
Convertible promissory note principle amount									$ 5,700,000
Proceeds from convertible promissory note									$ 5,000,000.0
Common stock conversion price | $ / shares									$ 0.55
Convertible promissory note maximum redemption amount												$ 350,000
Convertible promissory note redemption description									The June 2018 Note provided for conversion in total, or in part, of the outstanding balance, into common stock of the Company at any time after six months from the issue date upon five trading days’ notice, subject to certain adjustments and ownership limitations specified in the June 2018 Note, and allowed for redemption, at any time after six months from the issue date upon five trading days’ notice, subject to maximum monthly redemption amount of $350,000.			Effective November 15, 2018, the June 2018 Note was amended to allow the investor to redeem the monthly redemption amount of $350,000 in cash or stock, at the lesser of (i) $0.55, or (ii) the lowest closing bid price of the Company's common stock during the 20 days prior to the conversion, multiplied by a conversion factor of 85%.
Fair value of Note													6,900,000
Net carrying value of note													5,400,000
Interest paid									$ 525,000
Debt instrument gross issuance costs													$ 3,400,000
Number of days of notice to be given by the investor to the company for redemption													3 days
Debt instrument number of days of notice to be given by the company to the investor for prepayment													15 days
Number of days of notice to be given for conversion of notes into common stock													5 days
Debt instrument term													2 years
Note | Default Percentage Three [Member]
Class of Stock [Line Items]
Debt instrument percentage increase on principal payable on default													5.00%
2019 Short Term Convertible Notes
Class of Stock [Line Items]
Convertible note, aggregate principal													$ 5,500,000		$ 200,000										$ 200,000
Repayment of note															$ 700,000
Interest expense																100,000
Common stock conversion price | $ / shares																	$ 0.50
Outstanding balance of convertible note including accrued unpaid interest														$ 5,177,980			$ 5,177,980
Debt outstanding amount																									5,900,000
Common Stock, Shares, Issued | shares														10,357,034			10,357,034
2019 Short Term Convertible Notes | Tranche One [Member]
Class of Stock [Line Items]
Debt outstanding amount																									1,100,000
2019 Short Term Convertible Notes | Tranche Two [Member]
Class of Stock [Line Items]
Debt outstanding amount																									$ 4,100,000
January 2019 Note [Member]
Class of Stock [Line Items]
Convertible notes, interest rate													10.00%
Common stock warrants to purchase shares | shares													5,000,000
Exercise price of warrants, per share | $ / shares													$ 0.30		$ 0.30
Term of warrants													5 years
Unamortized discount													$ 600,000	$ 6,271,000			$ 6,271,000
Unamortized issuance costs													$ 100,000
Number of shares to be sold | shares													10,842,255
Interest expense													$ 100,000			100,000
Convertible promissory note principle amount											$ 5,700,000
Proceeds from convertible promissory note													$ 5,000,000.0
Common stock conversion price | $ / shares													$ 0.50
Convertible promissory note redemption description													The January 2019 Note provided the investor may redeem any portion of the January 2019 Note upon five trading days' notice, subject to a maximum monthly redemption amount of $350,000. The monthly redemption amount may be paid in cash or stock, at the Company's election, at the lesser of (i) $0.50, or (ii) the lowest closing bid price of the Company's common stock during the 20 days prior to the conversion, multiplied by a conversion factor of 85%.
Convertible note, redeemed amount						$ 350,000
Company Reserves Shares For Future Conversition | shares													20,000,000
Interest paid													$ 850,000
Convertible Promissory Notes [Member]
Class of Stock [Line Items]
Number of common shares issued upon conversion of preferred stock | shares																				1,000,000		1,000,000
Convertible note, aggregate principal													$ 17,100,000
Convertible notes, interest rate													10.00%
Common stock warrants to purchase shares | shares															4,750,000
Amortization of debt discount													$ 2,100,000
Proceeds from sale of common stock and warrant													$ 15,000,000.0
Common stock conversion price | $ / shares			$ 4.50										$ 4.50
Preferred Stock, Dividend Rate, Percentage													15.00%
Shares issued on conversion | shares			2,119,444										2.1
Convertible Promissory Notes [Member] | Conversion Of Debt Into Equity [Member]
Class of Stock [Line Items]
Amortization of debt discount													$ 917,000
March 2020 Long Term Convertible Notes [Member]
Class of Stock [Line Items]
Common stock shares reserved for future issuance | shares													3,800,000
July 2020 Long Term Convertible Notes [Member]
Class of Stock [Line Items]
Convertible notes, interest rate		10.00%
Convertible promissory note principle amount		$ 28,500,000
Proceeds from convertible promissory note		$ 25,000,000.0
Common stock conversion price | $ / shares													$ 10.00
Convertible promissory note maximum redemption amount													$ 1,600,000
Amortisation of debt issuance costs and discount													100,000
Unamortised discount and debt issuance costs													$ 3,300,000
Debt instrument lock in period													6 months
Debt instrument prepayment percentage premium													15.00%
Discount on Convertible Promissory Note																			$ 3,400,000
Expense Payable On Issuance Of Convertible Promissory Note																			$ 100,000
Common stock shares reserved for future issuance | shares													6,000,000
July 2020 Long Term Convertible Notes [Member] | Maximum
Class of Stock [Line Items]
Proceeds from sale of common stock and warrant													$ 25,000,000
Common Stock
Class of Stock [Line Items]
Conversion price | $ / shares													$ 0.50
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Share issuance price | $ / shares														$ 5.00			$ 5.00
Cash proceeds																		$ 2,009,000
Series B Convertible preferred stock, shares outstanding | shares													87,000	92,000			92,000
Common stock, shares authorized | shares																										100,000,000
Constructive dividend to Preferred stock holders													$ 6
Liquidation preference on common shares | $ / shares													$ 5.00
Dividends are payable to preferred stock holders | $ / shares													0.25
Convertible preferred stock, par value | $ / shares													$ 0.001	$ 0.001			$ 0.001
Preferred stock, shares authorized | shares													400,000	400,000			400,000
Preferred stock, shares issued | shares													87,000	92,000			92,000
Preferred stock date of dividend declaration	Jul. 30, 2020
Preferred stock cash dividend declared	$ 200,000
Series B Convertible Preferred Stock | Conversion of Preferred Stock to Common Stock
Class of Stock [Line Items]
Series B Convertible preferred stock, shares outstanding | shares													87,100
Preferred stock, shares issued | shares													400,000
Series C Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Share issuance price | $ / shares													$ 1,000
Cash proceeds							$ 1,542,545	$ 3,083,700
Series B Convertible preferred stock, shares outstanding | shares							1,754						8,000	8,000			8,000
Common stock, shares authorized | shares								5,000
Convertible preferred stock, par value | $ / shares								$ 0.001					$ 0.001	$ 0.001			$ 0.001
Placement agent fee							$ 211,455			$ 162,300
Preferred Stock, Dividend Rate, Percentage													10.00%
Convertible Preferred Stock Conversion Price | $ / shares													$ 0.50
Accrued dividends													$ 900,000			$ 100,000
Accrued dividend Shares | shares													1,832,000			296,000
Preferred stock, shares authorized | shares					8,203								8,000	8,000			8,000							20,000
Preferred stock, shares issued | shares								3,246					8,000	8,000			8,000							2,788
Series D Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Share issuance price | $ / shares				$ 1,000.00	$ 1,000.00
Cash proceeds				$ 882,000	$ 7,565,000
Series B Convertible preferred stock, shares outstanding | shares													9,000	9,000			9,000
Dividends are payable to preferred stock holders | $ / shares					$ 0.50
Convertible preferred stock, par value | $ / shares					$ 0.001								$ 0.001	$ 0.001			$ 0.001
Placement agent fee					$ 5,000
Preferred Stock, Dividend Rate, Percentage					10.00%
Convertible Preferred Stock Conversion Price | $ / shares					$ 0.80
Accrued dividends													$ 500,000
Accrued dividend Shares | shares													606,000
Preferred stock, shares authorized | shares					11,737								12,000	12,000			12,000
Preferred stock, shares issued | shares					7,570								9,000	9,000			9,000
Series D Convertible Preferred Stock | Common Stock
Class of Stock [Line Items]
Series B Convertible preferred stock, shares outstanding | shares													8,452