Description of Business and Basis of Presentation	9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	NOTE 1 – DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Description of Business Mateon Therapeutics, Inc. (f/k/a OXiGENE, Inc.) (the “Parent”, “Mateon”), was formed in the State of New York in 1988, was reincorporated in the State of Delaware in 1992 and changed its name to Mateon Therapeutics, Inc. in 2016. Mateon conducts business activities through both the Parent and its wholly-owned subsidiary Oncotelic, Inc. (“Oncotelic”), a Delaware corporation (collectively, the “Company”). Mateon is evaluating the further development of its product candidates OXi4503 as a treatment for acute myeloid leukemia and myelodysplastic syndromes and CA4P in combination with a checkpoint inhibitor for the treatment of advanced metastatic melanoma. On April 17, 2019, Mateon entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Oncotelic, a clinical-stage biopharmaceutical company developing investigational drugs for the treatment of orphan oncology indications and Mateon’s wholly-owned subsidiary Oncotelic Acquisition Corporation (the “Merger Sub”). Upon the terms of and subject to the satisfaction of the conditions described in the Merger Agreement, the Merger Sub would be merged with and into Oncotelic (the “Merger”), with Oncotelic surviving the Merger as a wholly-owned subsidiary of the Company. On April 22, 2019, Mateon completed the Merger and Oncotelic became a wholly-owned subsidiary of Mateon. Upon the completion of the Merger each share of Oncotelic common stock outstanding immediately prior to the Merger (excluding any shares of Oncotelic held by stockholders exercising dissenters’ appraisal rights) was converted pursuant to the Merger Agreement using the following ratios of (i) 3.97335267 shares of Mateon common stock, par value $0.01 per share (the “Common Stock”), and (ii) 0.01877292 shares of Mateon’s newly designated Series A Convertible Preferred Stock (the “Preferred Stock”). Following the closing of the Merger, the former Oncotelic security holders own approximately 85% of Mateon’s issued and outstanding Common Stock (including any shares of Common Stock issuable upon conversion of the Preferred Stock), and Mateon’s stockholders prior to the Merger own approximately 15% of Mateon’s issued and outstanding Common Stock (including any shares of Common Stock Issuable upon conversion of the Preferred Stock). The Merger was treated as a recapitalization and reverse acquisition for financial accounting purposes. Oncotelic is considered the acquirer for accounting purposes, and the registrant’s historical financial statements before the Merger have been replaced with the historical financial statements of Oncotelic prior to the Merger in the financial statements and filings with the Securities and Exchange Commission. The Company is a cancer immunotherapy company dedicated to the development of first in class self-immunization protocol (SIP™) candidates for difficult to treat cancers. The Company’s proprietary SIP™ candidates offer advantages over other immunotherapies because they do not require extraction of the tumor or isolation of the antigens, and they have the potential for broad-spectrum applicability for multiple cancer types. The Company’s proprietary product candidates have shown promising clinical activity in phase 2 trials for the treatment of gliomas and pancreatic cancers. The Company aims to translate its unique insights, which span more than three decades of original work using RNA therapeutics, into the deployment of antisense as a RNA therapeutic for diseases which are caused by TGF-beta overexpression, starting with cancer and expanding to Duchenne Muscular Dystrophy (DMD) and others. Oncotelic’s lead product candidate, OT-101, is being developed as a broad-spectrum anti-cancer drug that can also be used in combination with other standard cancer therapies to establish an effective multi-modality treatment strategy for difficult-to-treat cancers. Together, the Company plans to initiate phase 3 clinical trials for OT-101 in both high-grade glioma and pancreatic cancer; and any other indications that may evolve. Principles of Consolidation The unaudited condensed consolidated financial statements include the accounts of Mateon and its wholly-owned subsidiary, Oncotelic. Intercompany accounts and transactions have been eliminated in consolidation. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission including Form 10-Q and Regulation S-X. The information furnished herein reflects all adjustments (consisting of normal recurring accruals and adjustments) which are, in the opinion of management, necessary to fairly state the operating results for the respective periods. Certain information and footnote disclosures normally present in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) have been omitted pursuant to such rules and regulations. These financial statements should be read in conjunction with the audited financial statements and explanatory notes for the year ended December 31, 2018 as disclosed in our Form 8-KA filed on July 8, 2019. The results of the three and nine months ended September 30, 2019 (unaudited) are not necessarily indicative of the results to be expected for the pending full year ending December 31, 2019. Liquidity and Going Concern The accompanying unaudited condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern. The Company has incurred net losses of approximately $8.6 million since inception, had negative working capital of $2.7 million at September 30, 2019, of which approximately $1.1 million is attributable to assumed working capital of Mateon, and $0.3 million at December 31, 2018, respectively, and has negative cash flows from operations during the nine months ended September 30, 2019. These conditions raise substantial doubt about the Company’s ability to continue as a going concern for a period of one year from the date of this filing. Management expects to incur additional losses in the foreseeable future and recognizes the need to raise capital to remain viable. The accompanying unaudited condensed consolidated financial statements do not include any adjustments that might be necessary should the Company be unable to continue as a going concern. The Company’s long-term plans include continued development of its current pipeline of products to generate sufficient revenues, through either technology transfer or product sales, to cover its anticipated expenses. Until the Company is able to generate sufficient revenues from its current pipeline, the Company plans on funding its operations through the sale of equity and/or the issuance of debt, combined with or without warrants or other equity instruments. On April 17, 2019, the Company entered into a Securities Purchase Agreement with two institutional investors for a commitment to purchase convertible debentures in the aggregate principal amount of up to $400,000. On April 23, 2019, the Company issued two convertible notes in the principal amount of $200,000 each, both including an original issue discount (“OID”) of $20,000 and deferred financing costs of $5,000 each, receiving net proceeds of $350,000, which were used by the Company for working capital and general corporate purposes. (Note 6) Further, on April 17, 2019, the Company entered into a Securities Purchase Agreement with our CEO and an investor (the “Bridge Investor”) for a commitment to purchase convertible debentures in the aggregate amount of up to $400,000. On April 23, 2019, the Company issued a convertible debenture totaling $35,556 to the Bridge Investor, including OID of $3,556, receiving net proceeds of $32,000, which were used by the Company for working capital and general corporate purposes. (Note 6) Also on April 23, 2019, the Company issued a convertible note totaling $164,444, including OID of $16,444, to our Chief Executive Officer, receiving net proceeds of $148,000, which were used by the Company for working capital and general corporate purposes. (Note 6) On June 12, 2019, the Company received the second tranche under the first Securities Purchase Agreement above. The second tranche totaled $200,000, including $20,000 OID and $1,000 of deferred financing costs, receiving net proceeds of $179,000, which is planned to be used by the Company for working capital and general corporate purposes. (Note 6) On July 22, 2019, the Company entered into a convertible note purchase agreement with PointR Data, Inc., a privately held, developer of high performance cluster computer and artificial intelligence applications (“PointR”) for $200,000. The convertible note bears an interest rate of 8% per annum due on 15^th of each month and is payable, at the option of the holder, either in cash or in shares of the Company’s Common Stock. The convertible note has a maturity date of January 1, 2020. On August 6, 2019, the Company closed the second tranche of financing with our Bridge Investor, issuing an additional $200,000 face amount convertible debenture, including OID of $20,000 and $5,000 deferred financing costs, receiving net proceeds of $175,000. Following the drawdown of the second tranche from the Bridge Investor, up to $400,000 in face value of Debentures remains available under the Securities Purchase Agreement. Although no assurances can be given as to the Company’s ability to deliver on its revenue plans, or that unforeseen expenses may arise, management believes that the potential equity and debt financing or other potential financing will provide the necessary funding for the Company to continue as a going concern. Also, management cannot guarantee any potential debt or equity financing will be available on favorable terms or at all. As such, management does not believe they have sufficient cash for 12 months from the date of this report. If adequate funds are not available on acceptable terms, or at all, the Company will need to curtail operations, or cease operations completely.

Description of Business and Basis of Presentation

9 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

NOTE 1 – DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Description of Business

Mateon Therapeutics, Inc. (f/k/a OXiGENE, Inc.) (the “Parent”, “Mateon”), was formed in the State of New York in 1988, was reincorporated in the State of Delaware in 1992 and changed its name to Mateon Therapeutics, Inc. in 2016. Mateon conducts business activities through both the Parent and its wholly-owned subsidiary Oncotelic, Inc. (“Oncotelic”), a Delaware corporation (collectively, the “Company”). Mateon is evaluating the further development of its product candidates OXi4503 as a treatment for acute myeloid leukemia and myelodysplastic syndromes and CA4P in combination with a checkpoint inhibitor for the treatment of advanced metastatic melanoma.

On April 17, 2019, Mateon entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Oncotelic, a clinical-stage biopharmaceutical company developing investigational drugs for the treatment of orphan oncology indications and Mateon’s wholly-owned subsidiary Oncotelic Acquisition Corporation (the “Merger Sub”). Upon the terms of and subject to the satisfaction of the conditions described in the Merger Agreement, the Merger Sub would be merged with and into Oncotelic (the “Merger”), with Oncotelic surviving the Merger as a wholly-owned subsidiary of the Company.

On April 22, 2019, Mateon completed the Merger and Oncotelic became a wholly-owned subsidiary of Mateon. Upon the completion of the Merger each share of Oncotelic common stock outstanding immediately prior to the Merger (excluding any shares of Oncotelic held by stockholders exercising dissenters’ appraisal rights) was converted pursuant to the Merger Agreement using the following ratios of (i) 3.97335267 shares of Mateon common stock, par value $0.01 per share (the “Common Stock”), and (ii) 0.01877292 shares of Mateon’s newly designated Series A Convertible Preferred Stock (the “Preferred Stock”). Following the closing of the Merger, the former Oncotelic security holders own approximately 85% of Mateon’s issued and outstanding Common Stock (including any shares of Common Stock issuable upon conversion of the Preferred Stock), and Mateon’s stockholders prior to the Merger own approximately 15% of Mateon’s issued and outstanding Common Stock (including any shares of Common Stock Issuable upon conversion of the Preferred Stock).

The Merger was treated as a recapitalization and reverse acquisition for financial accounting purposes. Oncotelic is considered the acquirer for accounting purposes, and the registrant’s historical financial statements before the Merger have been replaced with the historical financial statements of Oncotelic prior to the Merger in the financial statements and filings with the Securities and Exchange Commission.

The Company is a cancer immunotherapy company dedicated to the development of first in class self-immunization protocol (SIP™) candidates for difficult to treat cancers. The Company’s proprietary SIP™ candidates offer advantages over other immunotherapies because they do not require extraction of the tumor or isolation of the antigens, and they have the potential for broad-spectrum applicability for multiple cancer types. The Company’s proprietary product candidates have shown promising clinical activity in phase 2 trials for the treatment of gliomas and pancreatic cancers. The Company aims to translate its unique insights, which span more than three decades of original work using RNA therapeutics, into the deployment of antisense as a RNA therapeutic for diseases which are caused by TGF-beta overexpression, starting with cancer and expanding to Duchenne Muscular Dystrophy (DMD) and others. Oncotelic’s lead product candidate, OT-101, is being developed as a broad-spectrum anti-cancer drug that can also be used in combination with other standard cancer therapies to establish an effective multi-modality treatment strategy for difficult-to-treat cancers. Together, the Company plans to initiate phase 3 clinical trials for OT-101 in both high-grade glioma and pancreatic cancer; and any other indications that may evolve.

Principles of Consolidation

The unaudited condensed consolidated financial statements include the accounts of Mateon and its wholly-owned subsidiary, Oncotelic. Intercompany accounts and transactions have been eliminated in consolidation.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission including Form 10-Q and Regulation S-X. The information furnished herein reflects all adjustments (consisting of normal recurring accruals and adjustments) which are, in the opinion of management, necessary to fairly state the operating results for the respective periods. Certain information and footnote disclosures normally present in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) have been omitted pursuant to such rules and regulations. These financial statements should be read in conjunction with the audited financial statements and explanatory notes for the year ended December 31, 2018 as disclosed in our Form 8-KA filed on July 8, 2019. The results of the three and nine months ended September 30, 2019 (unaudited) are not necessarily indicative of the results to be expected for the pending full year ending December 31, 2019.

Liquidity and Going Concern

The accompanying unaudited condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern. The Company has incurred net losses of approximately $8.6 million since inception, had negative working capital of $2.7 million at September 30, 2019, of which approximately $1.1 million is attributable to assumed working capital of Mateon, and $0.3 million at December 31, 2018, respectively, and has negative cash flows from operations during the nine months ended September 30, 2019. These conditions raise substantial doubt about the Company’s ability to continue as a going concern for a period of one year from the date of this filing. Management expects to incur additional losses in the foreseeable future and recognizes the need to raise capital to remain viable. The accompanying unaudited condensed consolidated financial statements do not include any adjustments that might be necessary should the Company be unable to continue as a going concern.

The Company’s long-term plans include continued development of its current pipeline of products to generate sufficient revenues, through either technology transfer or product sales, to cover its anticipated expenses. Until the Company is able to generate sufficient revenues from its current pipeline, the Company plans on funding its operations through the sale of equity and/or the issuance of debt, combined with or without warrants or other equity instruments.

On April 17, 2019, the Company entered into a Securities Purchase Agreement with two institutional investors for a commitment to purchase convertible debentures in the aggregate principal amount of up to $400,000.

On April 23, 2019, the Company issued two convertible notes in the principal amount of $200,000 each, both including an original issue discount (“OID”) of $20,000 and deferred financing costs of $5,000 each, receiving net proceeds of $350,000, which were used by the Company for working capital and general corporate purposes. (Note 6)

Further, on April 17, 2019, the Company entered into a Securities Purchase Agreement with our CEO and an investor (the “Bridge Investor”) for a commitment to purchase convertible debentures in the aggregate amount of up to $400,000.

On April 23, 2019, the Company issued a convertible debenture totaling $35,556 to the Bridge Investor, including OID of $3,556, receiving net proceeds of $32,000, which were used by the Company for working capital and general corporate purposes. (Note 6)

Also on April 23, 2019, the Company issued a convertible note totaling $164,444, including OID of $16,444, to our Chief Executive Officer, receiving net proceeds of $148,000, which were used by the Company for working capital and general corporate purposes. (Note 6)

On June 12, 2019, the Company received the second tranche under the first Securities Purchase Agreement above. The second tranche totaled $200,000, including $20,000 OID and $1,000 of deferred financing costs, receiving net proceeds of $179,000, which is planned to be used by the Company for working capital and general corporate purposes. (Note 6)

On July 22, 2019, the Company entered into a convertible note purchase agreement with PointR Data, Inc., a privately held, developer of high performance cluster computer and artificial intelligence applications (“PointR”) for $200,000. The convertible note bears an interest rate of 8% per annum due on 15^th of each month and is payable, at the option of the holder, either in cash or in shares of the Company’s Common Stock. The convertible note has a maturity date of January 1, 2020.

On August 6, 2019, the Company closed the second tranche of financing with our Bridge Investor, issuing an additional $200,000 face amount convertible debenture, including OID of $20,000 and $5,000 deferred financing costs, receiving net proceeds of $175,000. Following the drawdown of the second tranche from the Bridge Investor, up to $400,000 in face value of Debentures remains available under the Securities Purchase Agreement.

Although no assurances can be given as to the Company’s ability to deliver on its revenue plans, or that unforeseen expenses may arise, management believes that the potential equity and debt financing or other potential financing will provide the necessary funding for the Company to continue as a going concern. Also, management cannot guarantee any potential debt or equity financing will be available on favorable terms or at all. As such, management does not believe they have sufficient cash for 12 months from the date of this report. If adequate funds are not available on acceptable terms, or at all, the Company will need to curtail operations, or cease operations completely.