Convertible Debentures. Notes and Other Debt (Details Narrative) - USD ($)						1 Months Ended					3 Months Ended			6 Months Ended		12 Months Ended	13 Months Ended
	Apr. 21, 2020	Nov. 05, 2019	Aug. 06, 2019	Apr. 23, 2019	Apr. 23, 2019	Dec. 30, 2019	Nov. 30, 2019	Jul. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Nov. 30, 2020	Apr. 17, 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														460,339	$ 0
Total unamortized debt discount											472,632			472,632		$ 173,175
Derivative liability											991,462			991,462		540,517
Chance in fair value of derivative liability											$ 746,809			10,512		870,268
Amortization of OID and debt issuance costs														1,283,691	28,065
Non-cash compensation expense														2,147,591	340,674
Accrued interest														$ 1,028,869		1,003,870
Peak One Opportunity Fund, L.P [Member]
Debt Instrument [Line Items]
Conversion of debt, shares											569,800	2,012,145
Conversion of debt, amount											$ 50,000	$ 150,000
TFK Investments, LLC [Member]
Debt Instrument [Line Items]
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
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			25,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Initial debt discount											258,070			258,070
Total unamortized debt discount											232,054			232,054
Derivative liability																408,812
Chance in fair value of derivative liability														991,460		10,512
Convertible Debt [Member] | Peak One Opportunity Fund, L.P [Member] | Peak One 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 the Fixed Price, and then (ii) at the lower of (a) the Fixed Price or 65% of Mateon's lowest traded price after the first 180 days, or (b) at the lower of the Fixed Price or 55% of Mateon's traded stock price under certain circumstances. Mateon 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 Peak One Tranche #1 Conversion Shares. Mateon may redeem the Peak One Tranche #1 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. 30, 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] | Peak One 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] | Peak One 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] | TFK Investments, LLC [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount											8,345			8,345
Beneficial conversion feature, total										$ 84,570
Percentage of conversion price, description										(i) the Fixed Price during the first 180 days, and then (ii) at the lower of (a) the Fixed Price or 65% of Mateon's lowest traded price after the first 180 days, or (b) at the lower of the Fixed Price or 55% of Mateon's traded stock price under certain circumstances. Mateon 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 TFK 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
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
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														76,032
Conversion of debt, shares		300,000
Common stock percentage		65.00%
Conversion price per share		$ 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%
Conversion price per share							$ 0.10
Non-cash compensation expense							$ 60,000
Convertible Debt [Member] | Tranche One [Member] | Peak One Opportunity Fund, L.P [Member] | Peak One Purchase Agreement [Member]
Debt Instrument [Line Items]
Principal amount										$ 200,000
Convertible Debt [Member] | Tranche One [Member] | Peak One Opportunity Fund, L.P [Member] | Peak One Purchase Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Principal amount									$ 600,000				600,000		600,000
Convertible Debt [Member] | Third Tranche [Member] | Peak One Opportunity Fund, L.P [Member] | Peak One Purchase Agreement [Member]
Debt Instrument [Line Items]
Principal amount									200,000				200,000		200,000
Convertible Debt [Member] | Tranche Two [Member] | Peak One Opportunity Fund, L.P [Member] | Peak One Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount											152,511			152,511
Beneficial conversion feature, total									180,000
Principal amount									$ 200,000				200,000		200,000
Number of restricted stock issued									350,000
Maturity date									Jun. 30, 2022
Original issue discount, percentage									10.00%
Original issue discount									$ 20,000				20,000		20,000
Deferred financing costs									1,000				$ 1,000		$ 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														11,443
Convertible Debt [Member] | Tranche One [Member] | Peak One Opportunity Fund, L.P [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Principal amount											200,000			200,000
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											870,000			870,000		$ 541,000
Beneficial conversion feature, total														232,000
Chance in fair value of derivative liability														$ 10,512
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											409,000			$ 409,000
Bridge Investor [Member] | Bifurcation of the Embedded Conversion Option [Member] | Peak One and TFK Financing [Member]
Debt Instrument [Line Items]
Beneficial conversion feature, total														258,071
Vuong Trieu [Member] | Convertible Debt [Member] | Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Total unamortized debt discount											$ 9,948			9,948
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											$ 2,715
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) the Fixed Price during the first 180 days, and then (ii) at the lower of (a) the Fixed Price or 65% of Mateon's lowest traded price after the 180th day, or (b) at the lower of the Fixed Price or 55% of Mateon's traded stock price under certain circumstances. Mateon 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 Trieu Conversion Shares. The Company may redeem the Trieu 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
Chief Executive Officer [Member] | Fall 2019 Notes [Member]
Debt Instrument [Line Items]
Due to related parties											70,000			70,000
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%
Prepayment penalties
Peak One and TFK Financing [Member]
Debt Instrument [Line Items]
Amortization expense related to debt discount														$ 192,761
Debt instrument, conversion description														All the above SPAs with debenture notes issued to Peak One, TFK, our CEO and the bridge investors reached the 180 days prior to the end of the six months ended June 30, 2020. As such, all the note holders had the ability to convert that debt into equity at a conversion price of: (i) $0.10 per share during the first 180 days, and then (ii) at the lower of (a) the Fixed Price or the variable conversion price of 65% of the Company's lowest traded price after the first 180 days, or (b) the lower of the Fixed Price or 55% of Mateon'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											2,147			$ 2,147
Beneficial conversion feature, total														28,445
Percentage of conversion price, description					(i) the Fixed Price during the first 180 days, and then (ii) at the lower of (a) the Fixed Price or 65% of Mateon's lowest traded price after the first 180 days, or (b) at the lower of the Fixed Price or 55% of Mateon's traded stock price under certain circumstances. Mateon may redeem the Bridge Tranche #1 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									590
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											$ 17,495			17,495
Percentage of conversion price, description			(i) the Fixed Price during the first 180 days, and then (ii) the lower of (a) the Fixed Price or 65% of the Mateon's lowest traded price after the 180th day, or (b) at the lower of the Fixed Price or 55% of Mateon's traded stock price under certain circumstances. Mateon may redeem the Bridge Tranche #2 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											$ 155,680
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%