CytoDyn Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Private Equity Securities Offerings (Detail)

Private Equity Securities Offerings (Detail) - USD ($)																					1 Months Ended		12 Months Ended
Private Equity Securities Offerings (Detail) - USD ($)	Apr. 02, 2021	Mar. 18, 2021	Jan. 28, 2021	Dec. 08, 2020	Dec. 06, 2020	Dec. 04, 2020	Nov. 30, 2020	Nov. 17, 2020	Oct. 26, 2020	Oct. 14, 2020	Jun. 17, 2020	Mar. 13, 2020	Mar. 04, 2020	Feb. 28, 2020	Jan. 31, 2020	Dec. 30, 2019	Dec. 20, 2019	Aug. 29, 2019	Jul. 31, 2019	Mar. 20, 2019	Jan. 31, 2020	Nov. 08, 2019	May 31, 2021	May 31, 2020	May 31, 2019	Jan. 28, 2020	Nov. 30, 2019	Oct. 11, 2019	Oct. 10, 2019	Aug. 31, 2019
Class of Stock [Line Items]
Stock price, in dollars per share																							$ 1.50		$ 0.50
Exercise price of warrants, per share												$ 1.00																		$ 0.50
Common stock warrants to purchase shares												300,000																		2,600,000
Term of warrants												5 years																		5 years
Preferred Stock Shares authorized to be issued																							5,000,000	5,000,000
Common stock, par value						$ 0.001				$ 0.001									$ 0.001				$ 0.001	$ 0.001
Preferred stock, par value																							$ 0.001	$ 0.001
Stock issued via offering, tender or placement, value																								$ 13,409,000	$ 3,084,000
Shares issued on debt conversion																							19,900,000
Maximum
Class of Stock [Line Items]
Exercise price of warrants, per share																							$ 1.35
Minimum
Class of Stock [Line Items]
Exercise price of warrants, per share																							$ 0.30
Private Placement [Member]
Class of Stock [Line Items]
Stock price, in dollars per share								$ 1.50																	$ 0.50
Exercise price of warrants, per share																									$ 0.75
Warrant covering common stock shares purchased, percentage																									50.00%
Shares issued during the period new issues shares								670,000																	47,000,000.0
Common stock warrants to purchase shares																									23,500,000
Term of warrants																									5 years
Stock issued via offering, tender or placement, value																							$ 1,000,000		$ 23,488,000
Proceeds from issuance of common stock								$ 1,000,000.0																	23,500,000
Placement agent fees and expenses																									2,700,000
Accredited Investors [Member]
Class of Stock [Line Items]
Exercise price of warrants, per share																				$ 0.50
Common stock warrants to purchase shares																				3,900,000
Stock issued via offering, tender or placement, value																				$ 3,200,000
Certain Lead Investors [Member]
Class of Stock [Line Items]
Common stock warrants to purchase shares																				1,000,000.0
Private Warrant Exchange [Member]
Class of Stock [Line Items]
Stock price, in dollars per share	$ 0.90			$ 0.24		0.36	$ 0.60						$ 0.45			$ 0.50			$ 0.40
Exercise price of warrants, per share	$ 0.45			$ 0.30		$ 0.45	$ 0.75						$ 0.75		$ 0.50	$ 0.50					$ 0.50
Shares issued during the period new issues shares	1,100,000	200,000	3,600,000	2,000,000.0		300,000	500,000		5,000,000.0	7,000,000.0	16,500,000		88,000	8,600,000		2,700,000	4,700,000		11,300,000		4,400,000
Common stock warrants to purchase shares																							37,100,000
Warrants exchanged (in shares)			2,500,000	1,900,000		300,000	500,000		4,500,000	6,400,000	16,500,000												34,100,000
Stock issued via offering, tender or placement, value																							$ 17,556,000	6,021,000	$ 2,966,000
Proceeds from issuance of common stock	$ 700,000	$ 100,000	$ 2,900,000	$ 400,000		$ 100,000	$ 300,000		$ 1,600,000	$ 2,700,000	$ 7,400,000		$ 36,000	$ 2,200,000		$ 1,100,000	$ 800,000		$ 3,000,000.0		$ 1,900,000
Placement agent fees and expenses			100,000								400,000								300,000
Noncash inducement interest expense	$ 100,000	$ 32,000	$ 3,400,000	$ 700,000		$ 100,000	$ 200,000		$ 1,400,000	$ 2,200,000	$ 3,300,000								$ 200,000				$ 11,400,000	5,500,000
Private Warrant Exchange [Member] \| Maximum
Class of Stock [Line Items]
Stock price, in dollars per share		$ 0.90	$ 0.75						$ 0.60	$ 0.80	$ 0.70			$ 0.45			$ 0.25
Exercise price of warrants, per share		0.45	1.50						0.75	1.00	1.35			0.75			0.75
Private Warrant Exchange [Member] \| Minimum
Class of Stock [Line Items]
Stock price, in dollars per share		0.60	0.45						0.24	0.24	0.21			0.18			0.22
Exercise price of warrants, per share		$ 0.30	$ 0.90						$ 0.30	$ 0.30	$ 0.35			$ 0.30			$ 0.45
Private Warrant Exchange, Non-Inducement Shares [Member]
Class of Stock [Line Items]
Shares issued during the period new issues shares	800,000	100,000											80,000	7,800,000		2,200,000	3,400,000		7,500,000		4,000,000.0
Private Warrant Exchange, Inducement Shares [Member]
Class of Stock [Line Items]
Shares issued during the period new issues shares	300,000	100,000											8,000	800,000		500,000	1,300,000		3,800,000		400,000
Allotment to placement agent
Class of Stock [Line Items]
Common stock warrants to purchase shares																									4,400,000		700,000
Term of warrants																											5 years
Allotment to placement agent \| Maximum
Class of Stock [Line Items]
Exercise price of warrants, per share																											$ 0.44
Allotment to placement agent \| Minimum
Class of Stock [Line Items]
Exercise price of warrants, per share																											$ 0.40
Public Warrant Tender Offering [Member]
Class of Stock [Line Items]
Stock issued via offering, tender or placement, value																								$ 11,900,000
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock Shares authorized to be issued																							400,000	400,000
Preferred stock, par value																							$ 0.001	$ 0.001
Series C Convertible Preferred Stock
Class of Stock [Line Items]
Stock price, in dollars per share																		$ 1,000.00
Shares issued during the period new issues shares					415													1,754				2,788
Preferred Stock Shares authorized to be issued																							8,203	8,000		8,203		20,000	5,000
Preferred stock, par value																							$ 0.001	$ 0.001
Stock issued via offering, tender or placement, value																		$ 1,500,000
Placement agent fees and expenses																		$ 200,000
Series C Convertible Preferred Stock \| Accredited Investors [Member]
Class of Stock [Line Items]
Shares issued during the period new issues shares																				3,246
Series D Convertible Preferred Stock
Class of Stock [Line Items]
Stock price, in dollars per share												$ 1,000.00			$ 1,000.00						$ 1,000.00
Shares issued during the period new issues shares												882			7,570
Preferred Stock Shares authorized to be issued																							11,737	12,000
Preferred stock, par value															$ 0.001						$ 0.001		$ 0.001	$ 0.001
Stock issued via offering, tender or placement, value												$ 900,000			$ 7,600,000
Placement agent fees and expenses															$ 4,645