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Net Loss per Share - Narrative (Details) - $ / shares	Mar. 01, 2023	Aug. 08, 2022
Subsidiary, Sale of Stock [Line Items]
Share price (in dollars per share)	$ 1.82
Rights Offering
Subsidiary, Sale of Stock [Line Items]
Sale of stock price (in dollars per share)	$ 1.05	$ 0.97

X

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
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_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=smmt_RightsOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: