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v3.25.4

Summary of Significant Accounting Policies - Service Revenue (Details) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Service revenue contracts, term, low end of range | 1 year
Service revenue contracts, term, high end of range | 2 years

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- Definition Service Revenue Contracts, Term, High End of Range + References No definition available. + Details
Name: | ses_ServiceRevenueContractsTermHighEndOfRange
Namespace Prefix: | ses_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Service Revenue Contracts, Term, Low End of Range + References No definition available. + Details
Name: | ses_ServiceRevenueContractsTermLowEndOfRange
Namespace Prefix: | ses_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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