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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract]
The Company has a remaining commitment to spend	$ 7.8

X

- Definition

Joint Development Agreements, Expenditures Related to Engineering Efforts and Purchases of Related Equipment, Remaining Commitment to Spend.

+ References

No definition available.

+ Details

Name:	ses_JointDevelopmentAgreementsExpendituresRelatedToEngineeringEffortsAndPurchasesOfRelatedEquipmentRemainingCommitmentToSpend
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration