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v3.25.4

Revenue - Contract Liabilities (Details) $ in Thousands | 12 Months Ended
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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

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- 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

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- 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

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- 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

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

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