Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2023
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for reporting on Form 10-Q. The Company’s condensed consolidated financial statements include the accounts of Relay Therapeutics, Inc. and its wholly-owned subsidiaries, Relay Therapeutics Securities Corporation and Relay ML Discovery, LLC. All intercompany balances and transactions have been eliminated.
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying condensed consolidated balance sheet as of June 30, 2023, the condensed consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2023 and 2022, the condensed consolidated statements of stockholders’ equity for the three and six months ended June 30, 2023 and 2022, and the condensed consolidated statements of cash flows for the six months ended June 30, 2023 and 2022 are unaudited. The unaudited condensed consolidated interim financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the Company’s condensed consolidated financial position as of June 30, 2023, the condensed consolidated results of its operations for the three and six months ended June 30, 2023 and 2022, and cash flows for the six months ended June 30, 2023 and 2022. The condensed consolidated financial data and other information disclosed in these notes related to the three and six months ended June 30, 2023 and 2022 are unaudited. The condensed consolidated results for the three and six months ended June 30, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the fair value of contingent milestone payments in connection with the acquisition of ZebiAI Therapeutics, Inc. (“ZebiAI”), the determination of the transaction price and standalone selling price of performance obligations under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”), the accrual of research and development and manufacturing expenses, the valuation of equity instruments, and the incremental borrowing rate for determining operating lease assets and liabilities. Estimates are periodically reviewed in light of changes in circumstances, facts and experience.
Stock Compensation	Stock Compensation During the six months ended June 30, 2023, the Company granted stock options and restricted stock units (“RSUs”) to certain employees, with vesting over specified periods of continued service and contingent upon achievement of certain market conditions. The Company measured the fair value of such awards on the grant date using a Monte Carlo Simulation, incorporating various option pricing inputs. In connection therewith, compensation expense for such awards is being recognized under the accelerated attribution method over the requisite service period, regardless of whether the market conditions have been achieved. The Company recognizes the impact of forfeitures from market-based awards on compensation expense as they occur. For other stock options and RSUs granted to employees, directors, and other consultants with vesting over specified periods of continued service, the Company measures their fair value on the grant date using (a) the Black-Scholes Option Pricing Model for stock options and (b) the Company’s closing stock price. In connection therewith, compensation expense for such awards is being recognized under the straight-line method over the requisite service period, which is generally the vesting period. The Company recognizes the impact of forfeitures on compensation expense as they occur. For other stock options and RSUs granted to employees, directors, and other consultants with vesting over specified periods of continued service and contingent upon achievement of certain performance conditions, the Company measures their fair value on the grant date using (a) the Black-Scholes Option Pricing Model for stock options and (b) the Company’s closing stock price. In connection therewith, compensation expense for such awards is being recognized under the accelerated attribution method over the requisite service period, which is generally the vesting period. The Company recognizes the impact of forfeitures on compensation expense as they occur.
Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies that the Company adopts as of the specified effective date. The Company does not believe that the adoption of any recently issued standards have or may have a material impact on its condensed consolidated financial statements and disclosures.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2023

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for reporting on Form 10-Q.

The Company’s condensed consolidated financial statements include the accounts of Relay Therapeutics, Inc. and its wholly-owned subsidiaries, Relay Therapeutics Securities Corporation and Relay ML Discovery, LLC.

All intercompany balances and transactions have been eliminated.

Unaudited Interim Financial Information

The accompanying condensed consolidated balance sheet as of June 30, 2023, the condensed consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2023 and 2022, the condensed consolidated statements of stockholders’ equity for the three and six months ended June 30, 2023 and 2022, and the condensed consolidated statements of cash flows for the six months ended June 30, 2023 and 2022 are unaudited. The unaudited condensed consolidated interim financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the Company’s condensed consolidated financial position as of June 30, 2023, the condensed consolidated results of its operations for the three and six months ended June 30, 2023 and 2022, and cash flows for the six months ended June 30, 2023 and 2022. The condensed consolidated financial data and other information disclosed in these notes related to the three and six months ended June 30, 2023 and 2022 are unaudited. The condensed consolidated results for the three and six months ended June 30, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the fair value of contingent milestone payments in connection with the acquisition of ZebiAI Therapeutics, Inc. (“ZebiAI”), the determination of the transaction price and standalone selling price of performance obligations under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”), the accrual of research and development and manufacturing expenses, the valuation of equity instruments, and the incremental borrowing rate for determining operating lease assets and liabilities. Estimates are periodically reviewed in light of changes in circumstances, facts and experience.

Stock Compensation

During the six months ended June 30, 2023, the Company granted stock options and restricted stock units (“RSUs”) to certain employees, with vesting over specified periods of continued service and contingent upon achievement of certain market conditions. The Company measured the fair value of such awards on the grant date using a Monte Carlo Simulation, incorporating various option pricing inputs. In connection therewith, compensation expense for such awards is being recognized under the accelerated attribution method over the requisite service period, regardless of whether the market conditions have been achieved. The Company recognizes the impact of forfeitures from market-based awards on compensation expense as they occur.

For other stock options and RSUs granted to employees, directors, and other consultants with vesting over specified periods of continued service, the Company measures their fair value on the grant date using (a) the Black-Scholes Option Pricing Model for stock options and (b) the Company’s closing stock price. In connection therewith, compensation expense for such awards is being recognized under the straight-line method over the requisite service period, which is generally the vesting period. The Company recognizes the impact of forfeitures on compensation expense as they occur.

For other stock options and RSUs granted to employees, directors, and other consultants with vesting over specified periods of continued service and contingent upon achievement of certain performance conditions, the Company measures their fair value on the grant date using (a) the Black-Scholes Option Pricing Model for stock options and (b) the Company’s closing stock price. In connection therewith, compensation expense for such awards is being recognized under the accelerated attribution method over the requisite service period, which is generally the vesting period. The Company recognizes the impact of forfeitures on compensation expense as they occur.

Recently Issued Accounting Pronouncements Not Yet Adopted

From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies that the Company adopts as of the specified effective date. The Company does not believe that the adoption of any recently issued standards have or may have a material impact on its condensed consolidated financial statements and disclosures.