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Revenue - Contract Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Change in Contract with Customer, Liability [Abstract]
Contract liabilities, beginning balance	$ 0
Additions	8,442
Revenue recognized	(5,749)
Foreign exchange adjustments	(24)
Contract liabilities, ending balance	$ 2,669

X

- Definition

Contract with Customer, Liability, Additions

+ References

No definition available.

+ Details

Name:	ses_ContractWithCustomerLiabilityAdditions
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Foreign Exchange

+ References

No definition available.

+ Details

Name:	ses_ContractWithCustomerLiabilityForeignExchange
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Revenue Recognized Excluding Opening Balance

+ References

No definition available.

+ Details

Name:	ses_ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant