Organization and Nature of Business	12 Months Ended
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Business	1. Organization and Nature of Business Repare Therapeutics Inc. (“Repare” or the “Company”) is a precision medicine oncology company focused on the development of synthetic lethality-based therapies to patients with cancer. The Company was incorporated under the Canada Business Corporations Act on September 6, 2016. On June 23, 2020, immediately prior to the completion of its initial public offering (the “IPO”), the Company was continued as a corporation under the Business Corporations Act (Québec). On June 12, 2020, the Company effected a 1-for-6.062 reverse stock split of the Company’s share capital. Accordingly, all common shares, Series A and B convertible preferred shares, stock options and per share amounts in these consolidated financial statements have been retroactively adjusted to reflect the reverse stock split on a retroactive basis for all periods presented. On June 23, 2020, the Company completed its IPO of 12,650,000 of its common shares, including the exercise in full by the underwriters of their option to purchase up to 1,650,000 additional common shares, for aggregate gross proceeds of $253.0 million. The Company’s shares began trading on the Nasdaq Global Select Market under the ticker symbol “RPTX” on June 19, 2020. The Company received $232.0 million in net proceeds after deducting underwriting discounts and commissions and other offering expenses payable by the Company. Upon closing of the IPO, all outstanding convertible preferred shares converted into 21,558,393 common shares and the outstanding warrant was automatically exercised into 750,000 common shares. In November 2021, the Company completed a follow-on offering of 4,600,000 of its common shares, including the exercise in full by the underwriters of their option to purchase up to 600,000 additional common shares, at a public offering price of $22.00 per share, for net proceeds of $94.3 million, after deducting underwriting commissions as well as offering expenses of $0.8 million payable by the Company. Since inception, the Company has incurred operating losses. As of December 31, 2022, the Company had an accumulated deficit of $239.3 million. The Company does not have any products approved for sale and has financed its operations primarily through equity financings and funding from its collaboration and license agreements. Based on its current operating plan, the Company expects that its existing cash and cash equivalents and marketable securities on hand will be sufficient to fund its operating and capital expenditures into 2026. There can be no assurance that the Company will be able to obtain additional debt or equity financing, or generate product revenue or revenue from collaboration agreements, on a timely basis or at all. The failure of the Company to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on the Company’s business, results of operations and financial condition.

Organization and Nature of Business

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. Organization and Nature of Business

Repare Therapeutics Inc. (“Repare” or the “Company”) is a precision medicine oncology company focused on the development of synthetic lethality-based therapies to patients with cancer. The Company was incorporated under the Canada Business Corporations Act on September 6, 2016. On June 23, 2020, immediately prior to the completion of its initial public offering (the “IPO”), the Company was continued as a corporation under the Business Corporations Act (Québec).

On June 12, 2020, the Company effected a 1-for-6.062 reverse stock split of the Company’s share capital. Accordingly, all common shares, Series A and B convertible preferred shares, stock options and per share amounts in these consolidated financial statements have been retroactively adjusted to reflect the reverse stock split on a retroactive basis for all periods presented.

On June 23, 2020, the Company completed its IPO of 12,650,000 of its common shares, including the exercise in full by the underwriters of their option to purchase up to 1,650,000 additional common shares, for aggregate gross proceeds of $253.0 million. The Company’s shares began trading on the Nasdaq Global Select Market under the ticker symbol “RPTX” on June 19, 2020. The Company received $232.0 million in net proceeds after deducting underwriting discounts and commissions and other offering expenses payable by the Company. Upon closing of the IPO, all outstanding convertible preferred shares converted into 21,558,393 common shares and the outstanding warrant was automatically exercised into 750,000 common shares.

In November 2021, the Company completed a follow-on offering of 4,600,000 of its common shares, including the exercise in full by the underwriters of their option to purchase up to 600,000 additional common shares, at a public offering price of $22.00 per share, for net proceeds of $94.3 million, after deducting underwriting commissions as well as offering expenses of $0.8 million payable by the Company.

Since inception, the Company has incurred operating losses. As of December 31, 2022, the Company had an accumulated deficit of $239.3 million. The Company does not have any products approved for sale and has financed its operations primarily through equity financings and funding from its collaboration and license agreements. Based on its current operating plan, the Company expects that its existing cash and cash equivalents and marketable securities on hand will be sufficient to fund its operating and capital expenditures into 2026.

There can be no assurance that the Company will be able to obtain additional debt or equity financing, or generate product revenue or revenue from collaboration agreements, on a timely basis or at all. The failure of the Company to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on the Company’s business, results of operations and financial condition.