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Summary of Significant Accounting Policies - Property and equipment useful lives (Details)	12 Months Ended
	Dec. 31, 2021
Laboratory equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful Lives	2 years
Laboratory equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful Lives	10 years
Office and IT equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful Lives	3 years
Office and IT equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful Lives	5 years

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- 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

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=smmt_OfficeAndTechnologyEquipmentMember
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