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

Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Additional Information (Detail)

Convertible Instruments - Additional Information (Detail) - USD ($)					3 Months Ended	12 Months Ended
	Jan. 31, 2018	Jun. 14, 2017	Sep. 21, 2015	Jun. 23, 2015	May 31, 2015	May 31, 2018	May 31, 2017	May 31, 2016	May 31, 2015	May 31, 2010	Mar. 23, 2018	Nov. 01, 2017	Aug. 24, 2017	Jul. 28, 2017	Jun. 19, 2017	Aug. 24, 2016	Mar. 18, 2016	Mar. 17, 2016	Feb. 06, 2015	Sep. 26, 2014	Apr. 30, 2010
Class of Stock [Line Items]
Common stock, shares authorized						375,000,000	350,000,000					200,000,000	375,000,000			350,000,000	250,000,000	200,000,000			100,000,000
Common stock, par value						$ 0.001	$ 0.001
Sale of convertible notes						$ 4,888,500	$ 1,150,000
Amortization of discount on related party convertible notes								$ 94,344
Common stock warrants to purchase shares											3,027,263
Loss on extinguishment of convertible notes								(584,177)
Change in fair value of derivative liability						1,690,935	2,164,533	646,505
Amortization of convertible notes						1,666,017		1,791,967
Convertible notes payable, net							1,058,611
Convertible notes, repayment of principal and interest						259,157		789,140
Commission expense								108,000
Amortization of debt issuance costs						435,609		604,625
Proceeds from sale of common stock and warrant						25,224,212	19,133,755	37,569,964
Short-Term Convertible Notes
Class of Stock [Line Items]
Amortization of convertible notes								1,784,000
Convertible notes payable, net								0
Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Common stock warrants to purchase shares														33,333
Exercise price of warrants, per share														$ 1.00
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										$ 1,500,000	$ 2,000,000
Common stock issued upon conversion of notes				1,000,000
Conversion of Preferred Stock to Common Stock
Class of Stock [Line Items]
Undeclared dividend						199,000
Accrued dividend						$ 387,000
Common Stock
Class of Stock [Line Items]
Number of common shares issued upon conversion of preferred stock						10
Conversion price						$ 0.50
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								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%
AVCP Convertible Notes \| 2-Year Unsecured Convertible Promissory Note \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Convertible notes, interest rate					5.00%				5.00%
Convertible note maturity date									Sep. 26, 2016
Common stock warrant term									2 years
AVCP Convertible Notes \| 2-Year Unsecured Convertible Promissory Note \| Alpha Venture Capital Partners, L.P. \| 3-Month Unsecured Convertible Promissory Note
Class of Stock [Line Items]
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 \| Warrants Expire on December 31, 2019 \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Common stock warrants to purchase 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]
Common stock warrants to purchase 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				$ (584,177)
Change in fair value of derivative liability				647,000
Inducement interest				$ 758,000
AVCP Convertible Notes \| Previously Reported \| Alpha Venture Capital Partners, L.P.
Class of Stock [Line Items]
Increase / Decrease in number of shares of common stock					3,500,000				3,500,000
Short-Term Convertible Notes
Class of Stock [Line Items]
Convertible note maturity date	Jan. 31, 2018
Common stock warrants to purchase shares	7,718,010
Exercise price of warrants, per share	$ 0.75
Term of warrants	5 years
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	$ 6,000,000		$ 2,700,000
Accrued but unpaid interest								17,830
Convertible notes, repayment of principal and interest	$ 259,000							789,000
Number of shares to be sold	12,062,728
Sale of Stock, Price Per Share	$ 0.50
Proceeds from sale of common stock and warrant	$ 6,000,000
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%
Proceeds from issuance of debt									$ 4,000,000
Debt Instrument, Term									6 months
Conversion price, discount rate			10.00%
Short-Term Convertible Notes \| Investor Warrants \| 6-Month Unsecured Convertible Promissory Notes
Class of Stock [Line Items]
Common stock warrants to purchase shares					1,061,586				1,061,586
Exercise price of warrants, per share					$ 0.75				$ 0.75
Term of warrants					5 years				5 years
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 \| Detachable Common Stock Warrants
Class of Stock [Line Items]
Amortization of convertible notes						$ 1,600,000	0	1,900,000
Debt discount						1,500,000	$ 92,000.0	$ 0.0
2017 Short Term Convertible Notes
Class of Stock [Line Items]
Conversion price							$ 0.75
Convertible notes, interest rate							7.00%
Convertible note maturity date							Jan. 31, 2018
Common stock warrants to purchase shares	7,718,010						383,333								383,333
Exercise price of warrants, per share							$ 1.35
Term of warrants							5 years
Aggregate original principal amount of Short-Term Convertible Notes						4,890,000	$ 1,150,000
Convertible notes, repayment of principal and interest	$ 259,000					$ 250,000
Debt discount							$ 92,000
Payment obligation against which common stock issued	5,788,500
Accrued but unpaid interest	$ 243,000
Number of shares to be sold	12,062,728
Sale of Stock, Price Per Share	$ 0.50
Proceeds from sale of common stock and warrant	$ 6,000,000
2017 Short Term Convertible Notes \| Investor Warrants
Class of Stock [Line Items]
Common stock warrants to purchase shares						4,025,656	4,025,656
Exercise price of warrants, per share						$ 1.00	$ 1.00
Term of warrants						5 years	5 years
2017 Short Term Convertible Notes \| Detachable Common Stock Warrants
Class of Stock [Line Items]
Amortization of convertible notes						$ 1,600,000	$ 0
Debt discount						1,500,000	$ 92,000.0
Unamortized issuance costs						400,000
Amortization of debt issuance costs						$ 400,000
2017 Short Term Convertible Notes \| Minimum
Class of Stock [Line Items]
Exercise price of warrants, per share		$ 1.00
Warrant covering common stock shares purchased, percentage		25.00%
2017 Short Term Convertible Notes \| Maximum
Class of Stock [Line Items]
Exercise price of warrants, per share		$ 1.35
Warrant covering common stock shares purchased, percentage		50.00%
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Series B Convertible preferred stock, shares issued						92,100	92,100			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
Constructive dividend to Preferred stock holders						$ 6,000,000
Liquidation preference on common shares						$ 5.00
Dividends are payable to preferred stock holders						0.25
Convertible preferred stock, par value						$ 0.001	$ 0.001			$ 0.001