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Commitments and Contingencies (Details) - Strategic Automotive Original Equipment Manufacturer Partner $ in Millions | Mar. 31, 2025 USD ($)
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Other Commitments [Line Items] |
Joint development agreements, expenditures related to engineering efforts and purchases of related equipment, maximum | $ 35.0
Joint development agreements, expenditures related to engineering efforts and purchases of related equipment, cumulative amount spent | $ 24.0

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

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=ses_StrategicAutomotiveOriginalEquipmentManufacturerPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |