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v3.23.2

Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2023 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |
Unrecognized tax benefits, period increase (decrease), transfer pricing adjustments | $ 0.9

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- Definition Unrecognized Tax Benefits, Period Increase (Decrease), Transfer Pricing Adjustments + References No definition available. + Details
Name: | ses_UnrecognizedTaxBenefitsPeriodIncreaseDecreaseTransferPricingAdjustments
Namespace Prefix: | ses_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration