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v3.26.1

Summary of Significant Accounting Policies - Additional Information (Details) | Jan. 01, 2026
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Maximum [Member] |
Significant Accounting Policies [Line Items] |
Performance award Percentage | 200.00%
Minimum [Member] |
Significant Accounting Policies [Line Items] |
Performance award Percentage | 0.00%

X
- Definition Share Based Compensation Arrangement By Share Based Payment Award Performance Award Percentage + References No definition available. + Details
Name: | kymr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceAwardPercentage
Namespace Prefix: | kymr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant accounting policies. + References No definition available. + Details
Name: | kymr_SignificantAccountingPoliciesLineItems
Namespace Prefix: | kymr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |