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Commitments and contingencies - Licenses (Details) $ in Millions	9 Months Ended
	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