Subsequent Events	12 Months Ended
Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events In January 2022, the Company sold an aggregate of 2,173 shares of its common stock for aggregate net proceeds of $0.05 million at a weighted average sales price of approximately $24.01 per share under the at-the-market offering pursuant to the January 2021 Sales Agreements with Jefferies as sales agent. On January 31, 2022, GSK waived its rights under the GSK Collaboration Agreement to initiate, or request that the Company initiate, prior to GSK’s exercise of the Option, a Phase 1 combination clinical trial for a MAT2A product and GSK’s Type I PRMT inhibitor (GSK3368715) product, or the MAT2A Combination Trial. Accordingly, the Company has no further obligation under the GSK Collaboration Agreement to supply MAT2A product for the MAT2A Combination Trial at its own cost. IDEAYA’s obligation to supply the MAT2A compound under MAT2A Combination Study was deemed a material right under the GSK Collaboration Agreement. See Note 11, Revenue Recognition, for more information. On January 28, 2022, the Company exercised its option for an exclusive worldwide license covering a broad class of PARG inhibitors from Cancer Research Technology Ltd. (CRT) and the University of Manchester, and in connection therewith, paid a one-time option exercise fee of £250,000. The Company will be obligated to make payments to CRT aggregating up to £19.5 million upon the achievement of specific development and regulatory approval events for development of a PARG inhibitor in oncologic diseases. The Company will also pay low single-digit tiered royalties, and potentially also sales milestones, to CRT based on net sales of licensed products. In addition, in the event the Company sublicenses the intellectual property, it will also be obligated to pay CRT a specified percentage of any sublicense revenue.

Subsequent Events

12 Months Ended

Dec. 31, 2021

14. Subsequent Events

In January 2022, the Company sold an aggregate of 2,173 shares of its common stock for aggregate net proceeds of $0.05 million at a weighted average sales price of approximately $24.01 per share under the at-the-market offering pursuant to the January 2021 Sales Agreements with Jefferies as sales agent.

On January 31, 2022, GSK waived its rights under the GSK Collaboration Agreement to initiate, or request that the Company initiate, prior to GSK’s exercise of the Option, a Phase 1 combination clinical trial for a MAT2A product and GSK’s Type I PRMT inhibitor (GSK3368715) product, or the MAT2A Combination Trial. Accordingly, the Company has no further obligation under the GSK Collaboration Agreement to supply MAT2A product for the MAT2A Combination Trial at its own cost. IDEAYA’s obligation to supply the MAT2A compound under MAT2A Combination Study was deemed a material right under the GSK Collaboration Agreement. See Note 11, Revenue Recognition, for more information.

On January 28, 2022, the Company exercised its option for an exclusive worldwide license covering a broad class of PARG inhibitors from Cancer Research Technology Ltd. (CRT) and the University of Manchester, and in connection therewith, paid a one-time option exercise fee of £250,000. The Company will be obligated to make payments to CRT aggregating up to £19.5 million upon the achievement of specific development and regulatory approval events for development of a PARG inhibitor in oncologic diseases. The Company will also pay low single-digit tiered royalties, and potentially also sales milestones, to CRT based on net sales of licensed products. In addition, in the event the Company sublicenses the intellectual property, it will also be obligated to pay CRT a specified percentage of any sublicense revenue.