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v3.25.3

Commitments and contingencies - Licenses (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Maximum eligible development and commercial milestone payments | $ 122.0

X
- Definition Amount of maximum aggregate development and commercial milestone payments eligible to receive. + References No definition available. + Details
Name: | sgmt_MaximumAggregateDevelopmentAndCommercialMilestonePaymentsEligibleToReceive
Namespace Prefix: | sgmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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