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

Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

Subsequent Events - Additional Information (Detail)										1 Months Ended	12 Months Ended
Subsequent Events - Additional Information (Detail)	Jun. 26, 2018 USD ($) d $ / shares	Jun. 15, 2018 USD ($) $ / shares shares	Jun. 08, 2018 $ / shares shares	May 22, 2018 USD ($) $ / shares shares	Jan. 23, 2018 USD ($) $ / shares shares	Oct. 11, 2017 USD ($) $ / shares shares	Sep. 08, 2017 USD ($) $ / shares shares	Feb. 28, 2017 USD ($) $ / shares shares	Jan. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares shares	May 31, 2018 USD ($) $ / shares shares	Jul. 10, 2018 shares	Jun. 07, 2018 shares	Jun. 06, 2018 shares	Mar. 23, 2018 shares	Jan. 31, 2018 $ / shares shares	Nov. 01, 2017 shares	Aug. 24, 2017 shares	May 31, 2017 $ / shares shares	Aug. 24, 2016 shares	Mar. 18, 2016 shares	Mar. 17, 2016 shares	Apr. 30, 2010 shares
Subsequent Event [Line Items]
Common stock, shares authorized											375,000,000						200,000,000	375,000,000	350,000,000	350,000,000	250,000,000	200,000,000	100,000,000
Common stock covering common share															3,027,263
Net Proceeds from sale of common stock and warrants \| $											$ 8,990,000
Common stock par value \| $ / shares											$ 0.001								$ 0.001
Subscription Agreements
Subsequent Event [Line Items]
Purchase price, per share \| $ / shares				$ 0.50	$ 0.50	$ 0.65	$ 0.75	$ 0.75	$ 0.75
Common stock covering common share				4,640,000	3,071,014	940,380	1,668,163	2,835,323	767,498							7,718,010
Class of warrant, exercise price \| $ / shares				$ 0.75	$ 0.75	$ 0.75	$ 1.00	$ 1.00	$ 1.00							$ 0.75
Term of warrants				5 years	5 years	5 years	5 years	5 years	5 years							5 years
Net Proceeds from sale of common stock and warrants \| $				$ 2,100,000	$ 1,400,000	$ 1,100,000	$ 2,300,000	$ 3,800,000	$ 1,000,000
Placement Agent
Subsequent Event [Line Items]
Common stock covering common share				315,200	245,681	150,461	213,573	453,652	122,799	1,066,667
Class of warrant, exercise price \| $ / shares				$ 0.55	$ 0.55	$ 0.715	$ 0.825	$ 0.825	$ 0.825	$ 0.825
Term of warrants				5 years	5 years	5 years	5 years	5 years	5 years	5 years
Percentage of shares, issued as warrants				8.00%	8.00%	8.00%	8.00%	8.00%	8.00%	8.00%
Subsequent Event
Subsequent Event [Line Items]
Common stock, shares authorized													450,000,000	375,000,000
Subsequent Event \| Tranche 1
Subsequent Event [Line Items]
Vesting period			3 years
Stock option vested , shares			875,000
Subsequent Event \| Tranche 2
Subsequent Event [Line Items]
Vesting period			24 months
Stock option vested , shares			950,000
Subsequent Event \| 2018 Note
Subsequent Event [Line Items]
Convertible promissory note maturity period	2 years
Convertible promissory note principle amount \| $	$ 5,700,000
Proceeds from convertible promissory note \| $	5,000,000
Discount on convertible promissory note \| $	600,000
Expense payable on issuance of convertible promissory note \| $	$ 100,000
Debt stated percentage	10.00%
Event of default interest rate description	Upon the occurrence of an event of default, interest accrues at the lesser of 22% per annum or the maximum rate permitted by applicable law
Maximum interest rate on lease termination	22.00%
Common stock par value \| $ / shares	$ 0.001
Common stock conversion price \| $ / shares	$ 0.55
Convertible promissory note maximum redemption amount \| $	$ 350,000
Percentage premium to prepay convertible promissory note	15.00%
Common stock conversion description	The investor may convert all or any part the outstanding balance of the 2018 Note into shares of common stock, par value $0.001 per share, of the Company at an initial conversion price of $0.55 per share, 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 2018 Note
Convertible promissory note redemption description	The investor may redeem any portion of the 2018 Note, at any time after six months from the issue date upon five trading days’ notice, subject to a maximum monthly redemption amount of $350,000.
Consecutive trading days \| d	5
Subsequent Event \| Subscription Agreements
Subsequent Event [Line Items]
Number of shares to be sold		1,970,000
Purchase price, per share \| $ / shares		$ 0.50
Common stock covering common share		1,970,000
Class of warrant, exercise price \| $ / shares		$ 0.75
Term of warrants		5 years
Net Proceeds from sale of common stock and warrants \| $		$ 900,000
Subsequent Event \| Managing Director
Subsequent Event [Line Items]
Stock options granted, shares			600,000
Stock options granted, exercise price \| $ / shares			$ 0.49
Stock options, term			10 years
Vesting period			1 year
Stock option vested , shares												100,000
Subsequent Event \| Non Employee Director \| Minimum
Subsequent Event [Line Items]
Stock options granted, shares			75,000
Subsequent Event \| Non Employee Director \| Maximum
Subsequent Event [Line Items]
Stock options granted, shares			100,000
Subsequent Event \| Management Employees
Subsequent Event [Line Items]
Stock options granted, shares			1,825,000
Stock options granted, exercise price \| $ / shares			$ 0.49
Stock options, term			10 years
Subsequent Event \| Placement Agent
Subsequent Event [Line Items]
Common stock covering common share		133,600
Class of warrant, exercise price \| $ / shares		$ 0.55
Term of warrants		5 years
Percentage of shares, issued as warrants		8.00%
Subsequent Event \| Chief Science Officer
Subsequent Event [Line Items]
Stock option vested , shares												500,000