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Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Assumed contingent liabilities, non-current	$ 1,356	$ 1,209
Remeasurement gains (losses)	$ 0	$ 1,265

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- Definition

Business Combination, Assumed Contingent Liability, Noncurrent

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Business Combination, Assumed Contingent Liability, Remeasurement Gain (Loss)

+ 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration