Convertible Debentures. Notes and Other Debt (Details Narrative) - USD ($)								1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended	13 Months Ended
	Nov. 05, 2019	Nov. 05, 2019	Aug. 06, 2019	Jun. 12, 2019	Apr. 23, 2019	Apr. 23, 2019	Apr. 17, 2019	Apr. 30, 2020	Dec. 31, 2019	Nov. 30, 2019	Jul. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 30, 2020	Apr. 30, 2019
Debt Instrument [Line Items]
Convertible notes gross												$ 1,000,000		$ 1,000,000
Initial debt discount												800,140		800,140
Amortization expense related to debt discount														611,681	$ 88,479
Total unamortized debt discount									$ 173,175			321,290		321,290		$ 173,175
Derivative liability									541,000			776,000		776,000		541,000
Chance in fair value of derivative liability												49,992		60,504		870,268
Amortization of OID and debt issuance costs														1,591,261	88,479
Non-cash compensation expense														2,147,591	340,674
Accrued interest														1,008,037		1,003,870
TFK Investments, LLC [Member]
Debt Instrument [Line Items]
Principal amount												66,570		$ 66,570
Conversion of debt, shares														1,950,000
Conversion of debt, amount														$ 133,430
Series A Preferred Stock [Member] | PointR Shareholders [Member]
Debt Instrument [Line Items]
Accrued interest										$ 4,603
Shares conversion										84,475
Tranche One [Member] | Peak One Opportunity Fund, L.P [Member]
Debt Instrument [Line Items]
Conversion of debt, shares														2,581,945
Conversion of debt, amount														$ 200,000
Tranche Two [Member] | Peak One Opportunity Fund, L.P [Member]
Debt Instrument [Line Items]
Conversion of debt, shares														1,000,000
Conversion of debt, amount														$ 100,000
Fall 2019 Debt Financing [Member]
Debt Instrument [Line Items]
Gross proceeds from convertible debt									1,000,000
Additional gross proceeds from convertible debt									500,000
Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												88,888		88,888
Debt instrument, conversion description																	(a) into shares of the Company's Common Stock at a conversion price of $0.18 per share, or (b) into shares of common stock of the Company's newly formed subsidiary, EdgePoint AI, Inc., a Delaware Corporation, for AI/Blockchain in pharmaceutical manufacturing ("EdgePoint AI"), at a conversion price of $5.00 (based on a $5.0 million pre-money valuation) of EdgePoint AI and 1,000,000 shares outstanding.
Beneficial conversion feature, total																222,222
Amortization of OID and debt issuance costs												55,556	$ 0	111,112	$ 0
Debt interest rate										5.00%
Description on debt instrument																	All amounts outstanding under the Fall 2019 Notes become due and payable upon the approval of the holders of a majority of the principal amount of outstanding Fall 2019 Notes (the "Majority Holders") on or after (a) November 23, 2020 or (b) the occurrence of an event of default (either, the "Maturity Date"). The Company may prepay the Fall 2019 Notes at any time. Events of default under the Fall 2019 Notes include failure to make payments under the Fall 2019 Notes within thirty (30) days of the date due, failure to observe of the Fall 2019 Note Purchase Agreement or Fall 2019 Notes which is not cured within thirty (30) days of notice of the breach, bankruptcy, or a change in control of the Company (as defined in the Fall 2019 Note Purchase Agreement).
Interest expense												12,500		37,500
Convertible Debt [Member]
Debt Instrument [Line Items]
Initial debt discount												258,070		258,070
Total unamortized debt discount												232,054		232,054
Derivative liability									573,800							573,800
Chance in fair value of derivative liability														776,000		60,504
Convertible Debt [Member] | Peak One Opportunity Fund, L.P [Member] | Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												0		0
Beneficial conversion feature, total							$ 84,570
Percentage of conversion price, description							(i) a conversion price, during the first 180 days, of $0.10 per share (the "Fixed Price"), and then (2) at the lower of the Fixed Price or 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances. The Company has agreed to at all times, reserve and keep available out of its authorized Common Stock a number of shares equal to at least two times the full number of the Tranche #1 Conversion Shares. The Company may redeem the Convertible Note at rates of 110% to 140% over the principal balance dependent on certain events and redeem the value with accrued interest thereon, if any.
Principal amount							$ 200,000
Aggregate purchase price							$ 400,000
Number of restricted stock issued							350,000
Maturity date							Apr. 23, 2022
Original issue discount, percentage							10.00%
Original issue discount							$ 20,000
Deferred financing costs							5,000
Net proceeds from convertible debt							175,000
Beneficial conversion feature, excluding discount							52,285
Number of restricted stock issued, value							32,285
Amortization of OID and debt issuance costs														84,376
Convertible Debt [Member] | Peak One Opportunity Fund, L.P [Member] | Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Principal amount							$ 400,000
Percentage of charge on penalty							40.00%
Percentage of redemption of convertible note							140.00%
Convertible Debt [Member] | Peak One Opportunity Fund, L.P [Member] | Purchase Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty							18.00%
Percentage of redemption of convertible note							110.00%
Convertible Debt [Member] | Peak One Opportunity Fund, L.P [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Principal amount												100,000		100,000
Convertible Debt [Member] | TFK Investments, LLC [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												3,589		3,589
Beneficial conversion feature, total					$ 84,570
Percentage of conversion price, description					(i) a conversion price, during the first 180 days, of $0.10 per share (the "Fixed Price"), and then (2) at the lower of the Fixed Price or 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances. The Company has agreed to at all times reserve and keep available out of its authorized Common Stock a number of shares equal to at least two times the full number of the TFK Conversion Shares. The Company may redeem the Convertible Note at rates of 110% to 140% rates over the principal balance dependent on certain events and redeem the value with accrued interest thereon, if any.
Principal amount					$ 200,000	$ 200,000
Number of restricted stock issued					350,000
Maturity date	Jan. 08, 2020				Apr. 23, 2022
Original issue discount, percentage					10.00%
Original issue discount					$ 20,000	20,000
Deferred financing costs					5,000	5,000
Net proceeds from convertible debt					175,000
Beneficial conversion feature, excluding discount					52,285
Number of restricted stock issued, value					$ 32,285
Amortization of OID and debt issuance costs														80,788
Conversion of debt, shares	300,000
Common stock percentage	65.00%	65.00%
Conversion price per share	$ 0.10	$ 0.10
Non-cash compensation expense	$ 60,000
Convertible Debt [Member] | TFK Investments, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty					40.00%
Percentage of redemption of convertible note					140.00%
Convertible Debt [Member] | TFK Investments, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty					18.00%
Percentage of redemption of convertible note					110.00%
Convertible Debt [Member] | PointR Data, Inc [Member]
Debt Instrument [Line Items]
Principal amount											$ 200,000
Maturity date											Jan. 01, 2020
Net proceeds from convertible debt											$ 10,000,000
Debt interest rate											8.00%
Debt instrument, payment terms											Interest payments were due monthly on the 15th day of each calendar month (or the next business day thereafter), and were payable, at the option of PointR, either in cash or in shares of Mateon's Common Stock, valued at the closing price of the Common Stock on the principal market on which the Common Stock is either traded or quoted at such time. The PointR Convertible Note was due and payable on demand by PointR (a) at any time after January 1, 2020 or (b) upon the occurrence of an Event of Default (as defined in the PointR Convertible Note and the PointR Note Purchase Agreement).
Convertible Debt [Member] | Tranche One [Member] | Peak One Opportunity Fund, L.P [Member]
Debt Instrument [Line Items]
Maturity date		Jan. 18, 2020
Conversion of debt, shares		300,000
Common stock percentage	65.00%	65.00%
Non-cash compensation expense		$ 60,000
Convertible Debt [Member] | Tranche One [Member] | Peak One Opportunity Fund, L.P [Member] | Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Principal amount				$ 600,000
Convertible Debt [Member] | Third Tranche [Member] | Peak One Opportunity Fund, L.P [Member] | Purchase Agreement [Member]
Debt Instrument [Line Items]
Principal amount				200,000
Convertible Debt [Member] | Tranche Two [Member] | Peak One Opportunity Fund, L.P [Member] | Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												127,768		127,768
Beneficial conversion feature, total				180,000
Principal amount				$ 200,000
Number of restricted stock issued				350,000
Maturity date				Jun. 12, 2022
Original issue discount, percentage				10.00%
Original issue discount				$ 20,000
Deferred financing costs				1,000
Net proceeds from convertible debt				179,000
Beneficial conversion feature, excluding discount				132,091
Number of restricted stock issued, value				$ 47,909
Amortization of OID and debt issuance costs														36,187
Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Principal amount							$ 400,000
Bridge Investor [Member] | Convertible Debt [Member] | Peak One and TFK Financing [Member]
Debt Instrument [Line Items]
Derivative liability									$ 541,000			870,000		870,000		$ 541,000
Beneficial conversion feature, total														232,000
Chance in fair value of derivative liability														$ 60,500
Percentage of conversion price, description														As as such, all the noteholders had the ability to convert that debt into equity at the variable conversion price of 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances.
Bridge Investor [Member] | Convertible Debt [Member] | Peak One and TFK Financing [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Derivative liability												574,000		$ 574,000
Bridge Investor [Member] | Bifurcation of the Embedded Conversion Option [Member] | Peak One and TFK Financing [Member]
Debt Instrument [Line Items]
Beneficial conversion feature, total														258,070
Vuong Trieu [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												8,568		$ 8,568
Principal amount					$ 164,444	164,444												$ 164,444
Original issue discount, percentage														10.00%
Original issue discount					16,444	$ 16,444												$ 16,444
Net proceeds from convertible debt					148,000
Amortization of OID and debt issuance costs														$ 4,095
Vuong Trieu [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Bridge Investor [Member]
Debt Instrument [Line Items]
Beneficial conversion feature, total					$ 131,555
Percentage of conversion price, description					(i) a conversion price, during the first 180 days, of $0.10 per share (the "Fixed Price"), and then (2) at the lower of the Fixed Price or 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances. The Company may redeem the Convertible Note at rates of 110% to 140% rates over the principal balance dependent on certain events and redeem the value with accrued interest thereon, if any.
Maturity date					Apr. 23, 2022
Original issue discount, percentage					10.00%
Net proceeds from convertible debt					$ 148,000
Vuong Trieu [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty						40.00%
Percentage of redemption of convertible note						140.00%
Vuong Trieu [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty						18.00%
Percentage of redemption of convertible note						110.00%
Dr. Vuong Trieu [Member] | Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Principal amount										$ 250,000
Gross proceeds from convertible debt										500,000
Due to related parties										35,000
Stephen Boesch [Member] | Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Principal amount										250,000
Gross proceeds from convertible debt										500,000
Due to related parties										35,000
Dr. Sanjay Jha [Member] | Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Principal amount										250,000
Chulho Park [Member] | Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Due to related parties										27,000
Amit Shah [Member] | Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Due to related parties										20,000
Two Affiliates [Member] | Fall 2019 Notes [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Principal amount										$ 168,000
Silicon Valley Bank [Member] | Paycheck Protection Program Promissory Note [Member]
Debt Instrument [Line Items]
Principal amount								$ 250,000
Maturity date								Apr. 21, 2022
Debt interest rate								1.00%
Chief Executive Officer [Member] | Fall 2019 Notes [Member]
Debt Instrument [Line Items]
Due to related parties												70,000		70,000
Peak One and TFK Financing [Member]
Debt Instrument [Line Items]
Amortization expense related to debt discount														$ 262,556
Debt instrument, conversion description														All the above notes issued to Peak One, TFK, our CEO and the bridge investors reached the 180 days, TFK, our CEO and the bridge investors reached the 180 days prior to the end of the three months ended March 31, 2020. As such, all the note holders had the ability to convert that debt into equity at the variable conversion price of 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances.
Tranche One [Member] | Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												1,849		$ 1,849
Beneficial conversion feature, total														28,445
Percentage of conversion price, description						(i) a conversion price, during the first 180 days, of $0.10 per share (the "Fixed Price"), and then (2) at the lower of the Fixed Price or 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances. The Company may redeem the Convertible Note at rates of 110% to 140% rates over the principal balance dependent on certain events and redeem the value with accrued interest thereon, if any.
Principal amount					35,556	$ 35,556
Maturity date						Apr. 23, 2022
Original issue discount					$ 3,556	$ 3,556
Net proceeds from convertible debt						$ 32,000								888
Conversion price per share					$ 0.10	$ 0.10
Tranche One [Member] | Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty						40.00%
Percentage of redemption of convertible note						140.00%
Tranche One [Member] | Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty						18.00%
Percentage of redemption of convertible note						110.00%
Tranche 2 [Member] | Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount												$ 15,396		15,396
Percentage of conversion price, description			(2) at the lower of the Fixed Price or 65% of the Company's lowest traded price after the first 180 days or at the lower of the Fixed Price or 55% of the Company's traded stock price under certain circumstances. The Company may redeem the Convertible Note at rates of 110% to 140% rates over the principal balance dependent on certain events and redeem the value with accrued interest thereon, if any.
Principal amount			$ 200,000
Maturity date			Aug. 06, 2022
Original issue discount			$ 20,000
Deferred financing costs			5,000
Net proceeds from convertible debt			$ 175,000											$ 157,779
Tranche 2 [Member] | Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty			40.00%
Percentage of redemption of convertible note			140.00%
Tranche 2 [Member] | Bridge Investor [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of charge on penalty			18.00%
Percentage of redemption of convertible note			110.00%