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401(k) Retirement Savings Plan - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract] |  |  |
Percentage of maximum annual contribution per employee | 90.00% |  |
Matching contributions amount | $ 0.2 | $ 0.2 | $ 0.2
Defined contribution plan, plan name extensible description | 401(k) plan | 401(k) plan | 401(k) plan
Defined Contribution Plan, Sponsor Location [Extensible Enumeration] | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember
Defined Contribution Plan, Tax Status [Extensible List] | us-gaap:QualifiedPlanMember | us-gaap:QualifiedPlanMember | us-gaap:QualifiedPlanMember

X
- Definition Defined contribution plan plan name extensible description. + References No definition available. + Details
Name: | idya_DefinedContributionPlanPlanNameExtensibleDescription
Namespace Prefix: | idya_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates location of employer sponsoring defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanSponsorLocationExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates tax status of defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanTaxStatusExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | duration