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v3.22.4

Other Non-Current Liabilities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Payables and Accruals [Abstract] |  |
Assumed contingent liabilities, non-current | $ 2,531,000 | $ 2,263,000
Gain on remeasurement of contingent liability | $ 0 | $ 480,000

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- Definition Business Combination, Assumed Contingent Liability, Noncurrent + References No definition available. + Details
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Namespace Prefix: | smmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gain (Loss) On Remeasurement Of Liabilities, Nonoperating + References No definition available. + Details
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Namespace Prefix: | smmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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