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Commitments and Contingencies (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Feb. 09, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract] |  |  |
Capital commitments |  | $ 0 | $ 0
Contractual commitments |  | $ 37,700,000 |
Period for which the majority of contractual commitments are to be paid |  | 1 year |
Subsequent event |  |  |
Other Commitments [Line Items] |  |  |
Additional contractual commitments | $ 23,000,000 |  |

X
- Definition Other Commitment, Increase (Decrease) + References No definition available. + Details
Name: | smmt_OtherCommitmentIncreaseDecrease
Namespace Prefix: | smmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other Commitment, Period for Which the Majority of Commitments are To Be Paid + References No definition available. + Details
Name: | smmt_OtherCommitmentPeriodForWhichTheMajorityOfCommitmentsAreToBePaid
Namespace Prefix: | smmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |