CytoDyn Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

Convertible Instruments - Additional Information (Detail) - USD ($)								1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2020	Nov. 10, 2020	Jul. 30, 2020	Jul. 29, 2020	Jul. 27, 2020	Jan. 28, 2020	Jun. 26, 2018	Jan. 30, 2019	Nov. 15, 2018	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2020	Jul. 31, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Common stock, par value	$ 0.001									$ 0.001		$ 0.001		$ 0.001
Convertible notes, interest rate	10.00%									10.00%		10.00%
Exercise price of warrants, per share											$ 0.45		$ 0.45
Amortization of debt discount										$ 1,243,000	$ 439,000	$ 2,582,000	$ 1,470,000
Proceeds from sale of common stock and warrant												1,000,000	6,665,000
Proceeds from convertible promissory note								$ 5,000,000
Common stock conversion price							$ 0.55				$ 0.50
Convertible promissory note maximum redemption amount												950,000
Convertible note, redeemed amount												4,500,000
Outstanding balance of convertible note including accrued unpaid interest					$ 9,500,000
Extinguishment loss												(4,169,000)
Accrued dividends	$ 1,816,000									$ 1,816,000		$ 1,816,000		$ 981,000
Common Stock, Shares, Issued	590,279,000									590,279,000		590,279,000		519,261,000
Interest paid												$ 138,000	255,000
Preferred stock, par value	$ 0.001									$ 0.001		$ 0.001		$ 0.001
Gain loss on extinguishment of debt												$ (4,169,000)
Accrued interest on convertible notes	$ 1,133,000									$ 1,133,000		1,133,000		$ 292,000
Outstanding balance of convertible note including accrued unpaid interest					$ 9,500,000
Conversion Of Debt Into Equity [Member]
Class of Stock [Line Items]
Amortization of debt discount										$ 700,000		$ 1,900,000
Interest Rate Payable On Default [Member]
Class of Stock [Line Items]
Convertible notes, interest rate	10.00%									10.00%		10.00%
Debt Instrument, Interest Rate, Basis for Effective Rate	22
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%									15.00%		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%									10.00%		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%									5.00%		5.00%
Conversion of Preferred Stock to Common Stock
Class of Stock [Line Items]
Undeclared dividend												$ 7,700	200,000
Accrued dividend	$ 15,400									$ 15,400	$ 500,000	15,400	500,000
Note
Class of Stock [Line Items]
Convertible notes, interest rate							10.00%
Number of shares to be sold														8,500,000
Convertible promissory note principle amount							$ 5,700,000
Proceeds from convertible promissory note							$ 5,000,000.0
Common stock conversion price							$ 0.55
Convertible promissory note maximum redemption amount									$ 300,000
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 $0.35 million.		Effective November 15, 2018, the June 2018 Note was amended to allow the investor to redeem the monthly redemption amount of $0.35 million 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%.
Extinguishment loss												1,500,000
Fair value of Note	6,900,000									6,900,000		6,900,000
Net carrying value of note	5,400,000									$ 5,400,000		$ 5,400,000
Interest paid							$ 500,000
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												1 day
Number of days of notice to be given for conversion of notes into common stock												5 days
Debt instrument term										2 years
Gain loss on extinguishment of debt												$ 1,500,000
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									$ 5,500,000	200,000	$ 5,500,000	200,000			$ 200,000
Repayment of note											700,000
Interest expense													$ 300,000
Common stock conversion price														$ 0.50
Outstanding balance of convertible note including accrued unpaid interest														$ 5,200,000
Debt outstanding amount																5,900,000
Noncash inducement interest expense											$ 300,000
Common Stock, Shares, Issued														10,400,000
Outstanding balance of convertible note including accrued unpaid interest														$ 5,200,000
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%									10.00%		10.00%
Common stock warrants to purchase shares	5,000,000.0									5,000,000.0		5,000,000.0
Exercise price of warrants, per share	$ 0.30									$ 0.30	$ 0.30	$ 0.30	$ 0.30
Term of warrants												5 years
Unamortized discount	$ 600,000									$ 600,000		$ 600,000		$ 6,300,000
Unamortized issuance costs	100,000									$ 100,000		100,000
Number of shares to be sold										10,800,000
Interest expense													$ 400,000
Convertible promissory note principle amount								$ 5,700,000
Proceeds from convertible promissory note												$ 5,000,000.0
Common stock conversion price												$ 0.50
Convertible promissory note redemption description												The January 2019 Note provided the investor with the right to redeem any portion of the January 2019 Note, at any time after six months from the issue date upon five trading days’ notice, subject to a maximum monthly redemption amount of $0.35 million. 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%.
Company Reserves Shares For Future Conversition												20,000,000
Interest paid										$ 850,000
Convertible Promissory Notes [Member]
Class of Stock [Line Items]
Convertible note, aggregate principal	$ 17,100,000									$ 17,100,000		$ 17,100,000
Common stock warrants to purchase shares											4,750,000		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					$ 4.50							$ 4.50
Shares issued on conversion					2,100,000							2,100,000
March 2020 Long Term Convertible Notes [Member]
Class of Stock [Line Items]
Common stock, par value	$ 0.001									$ 0.001		$ 0.001
Amortization of debt discount												$ 600,000
Repayment of note										$ 4,300,000
Convertible note, redeemed amount												950,000
Extinguishment loss												4,200,000
Interest paid										950,000
Debt instrument prepayment amout payable		$ 7,500,000
Gain loss on extinguishment of debt												$ 4,200,000
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		$ 28,500,000
Proceeds from convertible promissory note		25,000,000.0		25,000,000.0
Common stock conversion price												$ 10.00
Convertible promissory note maximum redemption amount												$ 1,600,000
Outstanding balance of convertible note including accrued unpaid interest	$ 29,500,000									29,500,000		29,500,000
Amortisation of debt issuance costs and discount										400,000		600,000
Unamortised discount and debt issuance costs	$ 2,900,000									$ 2,900,000		$ 2,900,000
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	6,000,000.0									6,000,000.0		6,000,000.0
Debt insturument number of shares to be registered so that they are issued upon conversion															2.9
Accrued interest on convertible notes	$ 1,000,000.0									$ 1,000,000.0		$ 1,000,000.0
Outstanding balance of convertible note including accrued unpaid interest	$ 29,500,000									$ 29,500,000		29,500,000
July 2020 Long Term Convertible Notes [Member] \| Maximum
Class of Stock [Line Items]
Proceeds from sale of common stock and warrant												$ 25,000,000.0
Long Term Secured Convertible Notes 2020 [Member] \| Securities Purchase Agreement
Class of Stock [Line Items]
Debt instrument prepayment amout payable		$ 7,500,000
Common Stock, Capital Shares Reserved for Future Issuance		6,000,000.0
November 2020 Long Term Convertible Notes [Member]
Class of Stock [Line Items]
Convertible notes, interest rate	10.00%									10.00%		10.00%
Interest expense										$ 100,000		$ 100,000
Common stock conversion price												$ 10.00
Convertible promissory note maximum redemption amount												$ 3,500,000
Outstanding balance of convertible note including accrued unpaid interest	$ 28,600,000									28,600,000		28,600,000
Amortisation of debt issuance costs and discount												100,000
Unamortised discount and debt issuance costs	3,400,000									3,400,000		$ 3,400,000
Number of days of notice to be given by the investor to the company for redemption												3 days
Number of days of notice to be given for conversion of notes into common stock												5 days
Discount on Convertible Promissory Note	3,400,000									3,400,000		$ 3,400,000
Expense Payable On Issuance Of Convertible Promissory Note	100,000									100,000		100,000
Accrued interest on convertible notes	100,000									100,000		100,000
Outstanding balance of convertible note including accrued unpaid interest	$ 28,600,000									$ 28,600,000		$ 28,600,000
Common Stock
Class of Stock [Line Items]
Conversion price	$ 0.50									$ 0.50		$ 0.50
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding	87,000									87,000		87,000		92,000
Liquidation preference on common shares	$ 5.00									$ 5.00		$ 5.00
Dividends are payable to preferred stock holders												0.25
Preferred stock date of dividend declaration			Jul. 30, 2020
Preferred stock cash dividend declared			$ 200,000
Preferred stock, par value	$ 0.001									$ 0.001		$ 0.001		$ 0.001
Temporary equity shares authorised	400,000									400,000		400,000
Series B Convertible Preferred Stock \| Common Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding	87,100									87,100		87,100
Series C Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Share issuance price	$ 1,000									$ 1,000		$ 1,000
Preferred stock, shares outstanding	8,000									8,000		8,000		8,000
Preferred Stock, Dividend Rate, Percentage												(10.00%)
Convertible Preferred Stock Conversion Price	$ 0.50									$ 0.50		$ 0.50
Accrued dividends	$ 1,100,000									$ 1,100,000		$ 1,100,000		$ 700,000
Accrued dividend Shares	2,200,000									2,200,000		2,200,000		1,400,000
Preferred stock, par value	$ 0.001									$ 0.001		$ 0.001		$ 0.001
Temporary equity shares authorised	8,203									8,203		8,203
Series C Convertible Preferred Stock \| Common Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding	8,203									8,203		8,203
Series D Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Share issuance price	$ 1,000.00									$ 1,000.00		$ 1,000.00
Preferred stock, shares outstanding	9,000									9,000		9,000		9,000
Dividends are payable to preferred stock holders						$ 0.50
Preferred Stock, Dividend Rate, Percentage						(10.00%)
Convertible Preferred Stock Conversion Price	$ 0.80									$ 0.80		$ 0.80
Accrued dividends	$ 700,000									$ 700,000		$ 700,000		$ 300,000
Accrued dividend Shares	1,400,000									1,400,000		1,400,000		500,000
Preferred stock, par value	$ 0.001									$ 0.001		$ 0.001		$ 0.001
Temporary equity shares authorised	11,737									11,737		11,737
Series D Convertible Preferred Stock \| Common Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding	8,452									8,452		8,452