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Commitments and Contingencies - Commitments - Joint Development Agreements (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Joint Development Agreements, period, low end of range | 2 years
Joint Development Agreements, period, high end of range | 3 years
Joint Development Agreements, expenditures related to engineering efforts and purchases of related equipment, maximum | $ 50

X
- Definition Joint Development Agreements, Expenditures Related to Engineering Efforts and Purchases of Related Equipment, Maximum + References No definition available. + Details
Name: | ses_JointDevelopmentAgreementsExpendituresRelatedToEngineeringEffortsAndPurchasesOfRelatedEquipmentMaximum
Namespace Prefix: | ses_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Joint Development Agreements, Period, High End of Range + References No definition available. + Details
Name: | ses_JointDevelopmentAgreementsPeriodHighEndOfRange
Namespace Prefix: | ses_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Joint Development Agreements, Period, Low End of Range + References No definition available. + Details
Name: | ses_JointDevelopmentAgreementsPeriodLowEndOfRange
Namespace Prefix: | ses_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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