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

Annual report pursuant to Section 13 and 15(d)

Stock Options and Warrants - Additional Information (Detail)

Stock Options and Warrants - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended
	Oct. 07, 2019	Sep. 12, 2019	Apr. 16, 2019	May 31, 2020	May 31, 2019	May 31, 2018	Mar. 13, 2020	Feb. 04, 2020	Nov. 30, 2019	May 22, 2019	Apr. 15, 2019	Apr. 05, 2019	Feb. 13, 2019	Jun. 15, 2018	Aug. 24, 2017	May 31, 2017	Mar. 31, 2016	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, Shares			150,000
Stock options, term	10 years	10 years
Warrants to purchase common shares, shares								833,332
Term of warrants												5 years
Exercise price of warrants, per share									$ 0.45
Common Stock issued				519,261,580	329,554,763
Compensation expense				$ 6,547,803	$ 3,388,095	$ 1,290,777
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					500,000
Term of warrants					10 years
Exercise price of warrants, per share					$ 0.51
Warrants grant date fair value					$ 0.28
Placement Agent
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares									655,305			938,790	965,563	133,600
Term of warrants						5 years			5 years				5 years	5 years
Exercise price of warrants, per share												$ 0.50	$ 0.50	$ 0.55
Placement Agent \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants, per share									$ 0.40
Placement Agent \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants, per share									$ 0.444
Consultant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					300,000
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.56
Warrants grant date fair value					$ 0.30
Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares							275,625
Investor \| Series C Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					3,895,000
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.50
Two lead investor [Member] \| Series C Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					1,000,000
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.50
Private Equity Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares						35,286,904
Term of warrants					5 years	5 years
Exercise price of warrants, per share					$ 0.75	$ 0.75										$ 1.00
Proceeds from Issuance of Common Stock					$ 23,500,000
Private Equity Offering \| Placement Agent
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					4,446,917	2,813,491
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.50	$ 0.55
Private Equity Offering \| Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					23,487,585
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.75
Subscription Agreements \| Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of warrants							5 years
Exercise price of warrants, per share							$ 1.00
Convertible notes payable offering \| Placement Agent
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					972,000
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.50
Convertible notes payable offering \| Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					5,460,000
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.30
Direct equity offering \| Placement Agent
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares												938,790	965,563	133,600
Term of warrants											5 years		5 years	5 years
Exercise price of warrants, per share											$ 0.50		$ 0.50	$ 0.55
Direct equity offering \| Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares											5,465,500		5,364,240	1,970,000
Term of warrants											5 years		5 years	5 years
Exercise price of warrants, per share											$ 0.50		$ 0.50	$ 0.75
Secured convertible promissory note [Member] \| Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares					5,000,000
Term of warrants					5 years
Exercise price of warrants, per share					$ 0.30
Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common shares, shares				45,305,642
Common Stock issued				42,029,203
Proceeds from Issuance of Common Stock				$ 20,500,000
Warrants [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants, per share				$ 0.30
Warrants [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants, per share				$ 1.35
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 6,500,000	$ 3,400,000	$ 1,300,000
Grant date fair value of options and warrants				3,300,000	$ 2,100,000	$ 1,400,000
Unrecognized compensation expense				$ 800,000
Weighted average period over which unrecognized compensation expense is expected to be recognized				8 years 14 days
2012 Equity Incentive Plan \| Executive Management and Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Stock options, term					10 years
2012 Equity Incentive Plan \| Employee Stock Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, Shares				8,753,828
Stock options, term				10 years
Common Stock issued				8,723,070
Proceeds from Issuance of Common Stock				$ 5,600,000
2012 Equity Incentive Plan \| Employee Stock Option One \| Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, Shares				3,236,815
Stock option granted, exerices price				$ 0.39
2012 Equity Incentive Plan \| Employee Stock Option One \| Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price				2.25
2012 Equity Incentive Plan \| Employee Stock Option One \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price				0.39
2012 Equity Incentive Plan \| Employee Stock Option One \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price				$ 1.09
2012 Equity Incentive Plan \| Employee Stock Option One \| Director \| Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future stock-based grants				724,486
Stock option granted, Shares					1,219,726
Stock option granted, exerices price					$ 0.49
Stock option vested, Shares				2,512,329
Vesting period					1 year
Stock options, term					10 years
2012 Equity Incentive Plan \| Employee Stock Option One \| Director \| Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price					$ 0.57
2012 Equity Incentive Plan \| Employee Stock Option One \| Director \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options grant date fair value				$ 0.19
2012 Equity Incentive Plan \| Employee Stock Option One \| Director \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options grant date fair value				$ 1.65
2012 Equity Incentive Plan \| Employee Stock Option One \| Executive Management and Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future stock-based grants				1,650,000
Stock option granted, Shares				8,690,000
Stock option vested, Shares				4,600,000
Stock options, term				10 years
2012 Equity Incentive Plan \| Employee Stock Option One \| Executive Management and Employees \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vested, Shares				437,500
2012 Equity Incentive Plan \| Employee Stock Option One \| Executive Management and Employees \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vested, Shares				890,000
2012 Equity Incentive Plan \| Employee Stock Option One \| Executive Management and Employees \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vested, Shares				1,112,500
2012 Equity Incentive Plan \| Employee Stock Option One \| Executive Management and Employees \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price				$ 0.30
Stock options grant date fair value				0.12	0.26
2012 Equity Incentive Plan \| Employee Stock Option One \| Executive Management and Employees \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price				1.10
Stock options grant date fair value				$ 0.79	0.41
2012 Equity Incentive Plan \| Employee Stock Option One \| Managing Director \| Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options grant date fair value					0.29
2012 Equity Incentive Plan \| Employee Stock Option One \| Managing Director \| Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options grant date fair value					$ 0.31
2012 Equity Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future stock-based grants				1,162,511
2012 Equity Incentive Plan \| Stock Options \| Before Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance										15,000,000					7,000,000		5,000,000	3,000,000
2012 Equity Incentive Plan \| Stock Options \| After Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance										25,000,000					15,000,000		7,000,000	5,000,000
2012 Equity Incentive Plan \| Stock Options \| Executive Management and Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, Shares					3,715,000
Warrants to purchase common shares, shares					950,000
2012 Equity Incentive Plan \| Stock Options \| Executive Management and Employees \| Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price					$ 0.48
2012 Equity Incentive Plan \| Stock Options \| Executive Management and Employees \| Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exerices price					$ 0.57