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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Disclosures [Abstract] |  |
Fair value assets, level 3 to level 2 transfers, amount | $ 0 | $ 0
Fair value assets, level 2 to level 3 transfers, amount | $ 0 | $ 0

X
- Definition Fair value assets level 2 to Level 3 transfers amount. + References No definition available. + Details
Name: | kymr_FairValueAssetsLevel2ToLevel3TransfersAmount
Namespace Prefix: | kymr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value assets level 3 to level 2 transfers amount. + References No definition available. + Details
Name: | kymr_FairValueAssetsLevel3ToLevel2TransfersAmount
Namespace Prefix: | kymr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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