Nature of Business, Basis of Presentation and Liquidity	12 Months Ended
Dec. 31, 2017
Nature of Business, Basis of Presentation and Liquidity
Nature of Business, Basis of Presentation and Liquidity	1. Nature of Business, Basis of Presentation and Liquidity Nature of Business Leap Therapeutics, Inc. was incorporated in the state of Delaware as Dekkun Corporation on January 3, 2011 and changed its name to HealthCare Pharmaceuticals, Inc. effective May 29, 2014, and then to Leap Therapeutics, Inc. effective November 16, 2015 (the "Company"). During 2015, HealthCare Pharmaceuticals Pty Ltd ("HCP Australia") was formed and is a wholly owned subsidiary of the Company. During 2017, the Company merged with Macrocure Ltd. (now "Leap Therapeutics Ltd.") and its wholly owned subsidiary Macrocure, Inc. The Company is a biopharmaceutical company acquiring and developing novel therapeutics at the leading edge of cancer biology. The Company's approach is designed to target compelling tumor-promoting and immuno-oncology pathways to generate durable clinical benefit and enhanced outcomes for patients. The Company's programs are monoclonal antibodies that target key cellular pathways that enable cancer to grow and spread and specific mechanisms that activate the body's immune system to identify and attack cancer. Basis of Presentation The accompanying consolidated financial statements of the Company include the accounts of its wholly owned subsidiaries and have been prepared in conformity with accounting principles generally accepted in the United States of America. All inter-company accounts and transactions are eliminated upon consolidation. Merger with Macrocure Ltd. The Company entered into a definitive merger agreement (the "Merger Agreement"), dated as of August 29, 2016, with Macrocure Ltd. ("Macrocure"), a publicly held, clinical-stage biotechnology company based in Petach Tikva, Israel, and M-Co Merger Sub Ltd. ("Merger Sub"), a wholly owned subsidiary of the Company which provided for the merger of Macrocure with and into Merger Sub, with Macrocure continuing after the merger as a wholly owned subsidiary of the Company. Following the merger, the Company changed Macrocure's name to Leap Therapeutics Ltd. Pursuant to the Merger Agreement, the existing equity holders of the Company invested an additional $10,000 at the closing of the transaction. On January 23, 2017, the Company issued 3,256,898 shares of its common stock in exchange for 100% of the outstanding ordinary shares of Macrocure Ltd. upon consummation of the merger (see Note 3). Reverse Stock Split On January 20, 2017, the Company effected a 1-for-19.86754 reverse stock split of its issued and outstanding shares of common stock and a proportional adjustment to the existing conversion ratios for each series of the Company's Preferred Stock. Accordingly, all share and per share amounts for all periods presented in the accompanying financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect this reverse stock split and adjustment of the preferred stock conversion ratios. Private Placement of Common Stock On November 14, 2017, the Company entered into the Private Placement to issue an aggregate of 2,958,094 shares of unregistered common stock, at a price per share of $6.085, each share issued with a warrant to purchase one share of common stock at an exercise price of $6.085 with an exercise period expiring seven years after closing, for gross proceeds of approximately $18,000 (see Notes 7 and 9). Liquidity Since inception, the Company has been engaged in organizational activities, including raising capital, and research and development activities. The Company does not yet have a product that has been approved by the Food and Drug Administration (the "FDA"), has not generated any revenues and has not yet achieved profitable operations, nor has it ever generated positive cash flows from operations. There is no assurance that profitable operations, if achieved, could be sustained on a continuing basis. Further, the Company's future operations are dependent on the success of the Company's efforts to raise additional capital, its research and commercialization efforts, regulatory approval, and, ultimately, the market acceptance of the Company's products. In accordance with ASC 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company's ability to continue as a going concern within one year after the date that the consolidated financial statements are issued. As of December 31, 2017 the Company had an accumulated deficit of $130,397. During the year ended December 31, 2017, the Company incurred a loss of $29,727 and used $22,137 of cash in operations. The Company expects to continue to generate operating losses in the foreseeable future. The Company expects that its cash and cash equivalents of $25,737 at December 31, 2017, together with the receipt of $1,744 of research and development tax incentive payments from the Commonwealth of Australia as a result of the 2017 research and development activities of the Company's Australian subsidiary, HealthCare Pharmaceuticals Pty Ltd, net of the current Australia tax liability, will be sufficient to fund its operating expenses for at least the next 12 months from issuance of the financial statements. In addition, the Company will seek additional funding through public or private equity financings or government programs and will seek funding or development program cost-sharing through collaboration agreements or licenses with larger pharmaceutical or biotechnology companies. If the Company does not obtain additional funding or development program cost-sharing, the Company would be forced to delay, reduce or eliminate certain clinical trials or research and development programs, reduce or eliminate discretionary operating expenses, and delay company and pipeline expansion, which would adversely affect its business prospects. The inability to obtain funding, as and when needed, would have a negative impact on the Company's financial condition and ability to pursue its business strategies.

1. Nature of Business, Basis of Presentation and Liquidity

Nature of Business

Leap Therapeutics, Inc. was incorporated in the state of Delaware as Dekkun Corporation on January 3, 2011 and changed its name to HealthCare Pharmaceuticals, Inc. effective May 29, 2014, and then to Leap Therapeutics, Inc. effective November 16, 2015 (the "Company"). During 2015, HealthCare Pharmaceuticals Pty Ltd ("HCP Australia") was formed and is a wholly owned subsidiary of the Company. During 2017, the Company merged with Macrocure Ltd. (now "Leap Therapeutics Ltd.") and its wholly owned subsidiary Macrocure, Inc.

The Company is a biopharmaceutical company acquiring and developing novel therapeutics at the leading edge of cancer biology. The Company's approach is designed to target compelling tumor-promoting and immuno-oncology pathways to generate durable clinical benefit and enhanced outcomes for patients. The Company's programs are monoclonal antibodies that target key cellular pathways that enable cancer to grow and spread and specific mechanisms that activate the body's immune system to identify and attack cancer.

Basis of Presentation

The accompanying consolidated financial statements of the Company include the accounts of its wholly owned subsidiaries and have been prepared in conformity with accounting principles generally accepted in the United States of America. All inter-company accounts and transactions are eliminated upon consolidation.

Merger with Macrocure Ltd.

The Company entered into a definitive merger agreement (the "Merger Agreement"), dated as of August 29, 2016, with Macrocure Ltd. ("Macrocure"), a publicly held, clinical-stage biotechnology company based in Petach Tikva, Israel, and M-Co Merger Sub Ltd. ("Merger Sub"), a wholly owned subsidiary of the Company which provided for the merger of Macrocure with and into Merger Sub, with Macrocure continuing after the merger as a wholly owned subsidiary of the Company. Following the merger, the Company changed Macrocure's name to Leap Therapeutics Ltd. Pursuant to the Merger Agreement, the existing equity holders of the Company invested an additional $10,000 at the closing of the transaction. On January 23, 2017, the Company issued 3,256,898 shares of its common stock in exchange for 100% of the outstanding ordinary shares of Macrocure Ltd. upon consummation of the merger (see Note 3).

Reverse Stock Split

On January 20, 2017, the Company effected a 1-for-19.86754 reverse stock split of its issued and outstanding shares of common stock and a proportional adjustment to the existing conversion ratios for each series of the Company's Preferred Stock. Accordingly, all share and per share amounts for all periods presented in the accompanying financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect this reverse stock split and adjustment of the preferred stock conversion ratios.

Private Placement of Common Stock

On November 14, 2017, the Company entered into the Private Placement to issue an aggregate of 2,958,094 shares of unregistered common stock, at a price per share of $6.085, each share issued with a warrant to purchase one share of common stock at an exercise price of $6.085 with an exercise period expiring seven years after closing, for gross proceeds of approximately $18,000 (see Notes 7 and 9).

Liquidity

Since inception, the Company has been engaged in organizational activities, including raising capital, and research and development activities. The Company does not yet have a product that has been approved by the Food and Drug Administration (the "FDA"), has not generated any revenues and has not yet achieved profitable operations, nor has it ever generated positive cash flows from operations. There is no assurance that profitable operations, if achieved, could be sustained on a continuing basis. Further, the Company's future operations are dependent on the success of the Company's efforts to raise additional capital, its research and commercialization efforts, regulatory approval, and, ultimately, the market acceptance of the Company's products.

In accordance with ASC 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company's ability to continue as a going concern within one year after the date that the consolidated financial statements are issued. As of December 31, 2017 the Company had an accumulated deficit of $130,397. During the year ended December 31, 2017, the Company incurred a loss of $29,727 and used $22,137 of cash in operations. The Company expects to continue to generate operating losses in the foreseeable future. The Company expects that its cash and cash equivalents of $25,737 at December 31, 2017, together with the receipt of $1,744 of research and development tax incentive payments from the Commonwealth of Australia as a result of the 2017 research and development activities of the Company's Australian subsidiary, HealthCare Pharmaceuticals Pty Ltd, net of the current Australia tax liability, will be sufficient to fund its operating expenses for at least the next 12 months from issuance of the financial statements. In addition, the Company will seek additional funding through public or private equity financings or government programs and will seek funding or development program cost-sharing through collaboration agreements or licenses with larger pharmaceutical or biotechnology companies. If the Company does not obtain additional funding or development program cost-sharing, the Company would be forced to delay, reduce or eliminate certain clinical trials or research and development programs, reduce or eliminate discretionary operating expenses, and delay company and pipeline expansion, which would adversely affect its business prospects. The inability to obtain funding, as and when needed, would have a negative impact on the Company's financial condition and ability to pursue its business strategies.