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 ($)					3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 21, 2015	Jun. 23, 2015	Feb. 06, 2015	Sep. 26, 2014	Feb. 28, 2017	Feb. 29, 2016	May 31, 2015	Feb. 28, 2017	Feb. 29, 2016	May 31, 2016	May 31, 2015	May 31, 2010	Aug. 24, 2016	Mar. 18, 2016	Mar. 17, 2016	May 31, 2013	Apr. 30, 2010
Class of Stock [Line Items]
Common stock, shares authorized					350,000,000			350,000,000		250,000,000			350,000,000	250,000,000	200,000,000		100,000,000
Common stock, par value					$ 0.001			$ 0.001		$ 0.001
Amortization of convertible notes									$ 2,121,491
Interest expense associated with extension of warrant expiration								$ 72,437	866,713
Amortization of discount on related party convertible notes									94,344	$ 94,344
Loss on extinguishment of convertible notes									(584,177)
Change in fair value of derivative liability					$ (26,666)			$ 1,196,800	646,505	646,505
Inducement interest									2,061,600
Convertible notes, repayment of principal and interest									789,140
Commission expense										108,000
Common Stock
Class of Stock [Line Items]
Number of common shares issued upon conversion of preferred stock					10			10
Conversion price					$ 0.50			$ 0.50
Short-Term Convertible Notes
Class of Stock [Line Items]
Amortization of convertible notes								$ 0	1,784,000
Convertible notes payable, net										0
Alpha Venture Capital Partners, L.P. \| 3-Month Unsecured Convertible Promissory Note
Class of Stock [Line Items]
Convertible note, face amount							$ 1,500,000				$ 1,500,000
2-Year Unsecured Convertible Promissory Note \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Convertible note, face amount							$ 2,000,000				$ 2,000,000
2013 Convertible Notes
Class of Stock [Line Items]
Convertible note, face amount																$ 6,588,250
Convertible note maturity start date								Nov. 30, 2013
Convertible note maturity end date								Mar. 06, 2016
Amortization of convertible notes								$ 0	7,000
Principal amount of notes converted										50,000
2013 Convertible Notes \| Convertible Note at $0.75 per Share
Class of Stock [Line Items]
Conversion price																$ 0.75
Convertible note, principal amount					$ 0			$ 0		$ 0						$ 6,208,250
2013 Convertible Notes \| Convertible Note at $0.65 per Share
Class of Stock [Line Items]
Conversion price																$ 0.65
Convertible note, principal amount																$ 380,000
2013 Convertible Notes \| Minimum
Class of Stock [Line Items]
Convertible notes, interest rate																5.00%
2013 Convertible Notes \| Maximum
Class of Stock [Line Items]
Convertible notes, interest rate																10.00%
2013 Convertible Notes \| Investor
Class of Stock [Line Items]
Interest on convertible notes payment start date								Apr. 01, 2013
2013 Convertible Notes \| Detachable Common Stock Warrants
Class of Stock [Line Items]
Common stock warrant term										2 years
Warrants to purchase common shares, shares										6,300,000
Exercise price of warrants, per share										$ 1.00
Common stock warrants, extended period										1 year
Warrants, exercisable date										Oct. 01, 2016
Interest expense associated with extension of warrant expiration										$ 866,700
Common stock warrants, extended expiration date final										May 31, 2017
2013 Convertible Notes \| Detachable Common Stock Warrants \| Minimum
Class of Stock [Line Items]
Common stock warrants, Current expiration date										2015-10
Common stock warrants, extended expiration date										2016-10
2013 Convertible Notes \| Detachable Common Stock Warrants \| Maximum
Class of Stock [Line Items]
Common stock warrants, Current expiration date										2016-01
Common stock warrants, extended expiration date										2017-01
2013 Convertible Notes \| Detachable Common Stock Warrants \| Investor
Class of Stock [Line Items]
Common stock warrant term								2 years
Warrants to purchase common shares, shares					8,527,984			8,527,984
2013 Convertible Notes \| Detachable Common Stock Warrants \| Investor \| Minimum
Class of Stock [Line Items]
Exercise price of warrants, per share					$ 0.75			$ 0.75
2013 Convertible Notes \| Detachable Common Stock Warrants \| Investor \| Maximum
Class of Stock [Line Items]
Exercise price of warrants, per share					$ 2.00			$ 2.00
AVCP Convertible Notes
Class of Stock [Line Items]
Change in fair value of derivative liability					$ 0	$ 647,000		$ 0	647,000
AVCP Convertible Notes \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Conversion price							$ 0.675				$ 0.675
Sale of convertible notes							$ 4,000,000
Percentage of weighted average price per share							90.00%
Weighted average price of deemed issued shares							$ 0.75				$ 0.75
Increase / Decrease in number of shares of common stock							5,185,185				5,185,185
Amortization of discount on related party convertible notes								$ 0	$ 94,000
Principal amount of notes converted		$ 3,535,627
Common stock issued upon conversion of notes		5,237,966
AVCP Convertible Notes \| Alpha Venture Capital Partners, L.P. \| 3-Month Unsecured Convertible Promissory Note
Class of Stock [Line Items]
Preferred Stock, Share issuance price							$ 0.9444				$ 0.9444
Conversion price							$ 1.00				$ 1.00
Convertible notes, interest rate							1.20%				1.20%
Convertible note maturity date								May 05, 2015
Additional convertible promissory notes that may be issued							$ 6,000,000				$ 6,000,000
Percentage reduction to conversion price											10.00%
Convertible note, conversion price description								The conversion price was subject to (i) adjustment for stock splits and similar corporate events and (ii) reduction to a price per share that is 10% below the lowest sale price that is below $.9444 per share, for shares of common stock sold or deemed sold in future securities offerings, including sales to AVCP and its designees subject to certain exempt transactions.
AVCP Convertible Notes \| Alpha Venture Capital Partners, L.P. \| Previously Reported
Class of Stock [Line Items]
Increase / Decrease in number of shares of common stock							3,500,000				3,500,000
AVCP Convertible Notes \| 2-Year Unsecured Convertible Promissory Note \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Conversion price							$ 1.00				$ 1.00
Convertible notes, interest rate							5.00%				5.00%
Common stock warrant term											2 years
Convertible note maturity date											Sep. 26, 2016
AVCP Convertible Notes \| Warrants Expire on December 31, 2019 \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Warrants to purchase common shares, shares				250,000
Exercise price of warrants, per share				$ 0.50
Warrants, expiration date								Dec. 31, 2019
Term of warrants				5 years
AVCP Convertible Notes \| Warrants Exercisable on February 28, 2020 \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Warrants to purchase common shares, shares			75,000
Exercise price of warrants, per share			$ 0.50
Warrants, expiration date								Feb. 29, 2020
Term of warrants			5 years
AVCP Convertible Notes \| Additional 5-year Warrant \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Exercise price of warrants, per share		$ 0.675
Term of warrants		5 years
Common stock issued upon conversion of notes		1,000,000
Loss on extinguishment of convertible notes		$ (584,000)
Change in fair value of derivative liability		647,000
Inducement interest		$ 758,000
Short-Term Convertible Notes
Class of Stock [Line Items]
Principal amount of notes converted										$ 525,000
Common stock issued upon conversion of notes										723,773
Inducement interest										$ 330,000
Aggregate original principal amount of Short-Term Convertible Notes	$ 2,700,000
Accrued but unpaid interest										17,830
Convertible notes, repayment of principal and interest										$ 789,000
Short-Term Convertible Notes \| 6-Month Unsecured Convertible Promissory Notes
Class of Stock [Line Items]
Conversion price	$ 0.675						$ 0.75				$ 0.75
Convertible notes, interest rate							7.00%				7.00%
Principal amount of notes converted											$ 1,300,000
Proceeds from issuance of debt											$ 4,000,000
Debt Instrument, Term											6 months
Conversion price, discount rate	10.00%
Short-Term Convertible Notes \| Common Stock Warrants
Class of Stock [Line Items]
Exercise price of warrants, per share	$ 0.675
Exercise price of warrants, per share, discount rate	10.00%
Short-Term Convertible Notes \| Investor Warrants \| 6-Month Unsecured Convertible Promissory Notes
Class of Stock [Line Items]
Warrants to purchase common shares, shares							1,061,586				1,061,586
Exercise price of warrants, per share							$ 0.75				$ 0.75
Term of warrants											5 years
Conversion of Preferred Stock to Common Stock
Class of Stock [Line Items]
Common stock, par value					$ 0.001			$ 0.001
Accrued and unpaid dividends					$ 5,300			$ 5,300
Conversion of Preferred Stock to Common Stock \| Common Stock
Class of Stock [Line Items]
Number of common shares issued upon conversion					40,602
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Series B Convertible preferred stock, shares issued					92,100			92,100		95,100		400,000
Preferred Stock, Share issuance price												$ 5.00
Cash proceeds												$ 2,009,000
Series B Convertible preferred stock, shares outstanding					92,100			92,100		95,100
Constructive dividend to Preferred stock holders								$ 6,000,000
Liquidation preference on common shares					$ 5.00			$ 5.00
Dividends are payable to preferred stock holders								0.25
Convertible preferred stock, par value					$ 0.001			$ 0.001		$ 0.001		$ 0.001
Series B Convertible Preferred Stock \| Conversion of Preferred Stock to Common Stock
Class of Stock [Line Items]
Number of preferred shares converted into common shares					3,000