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Summary of Significant Accounting Policies - Service Revenue (Details)	12 Months Ended
	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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

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