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Commitments and Contingencies (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Jun. 16, 2025 ft²
Gain Contingencies [Line Items]
Period for which the majority of contractual commitments are to be paid	1 year
CALIFORNIA
Gain Contingencies [Line Items]
Area of premises subleased from other party (in square feet) | ft²		36,406
Total sublease rental payments to be received | $	$ 22,336
Lease term (in months)	94 months

X

- Definition

Area Of Premises Subleased

+ References

No definition available.

+ Details

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Namespace Prefix:	smmt_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Other Commitment, Period for Which the Majority of Commitments are To Be Paid

+ References

No definition available.

+ Details

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483049/450-30-50-1

+ Details

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X

- Definition

Term of lessor's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

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Balance Type:	na
Period Type:	instant

X

- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-12

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Period Type:	instant

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