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Stock-Based Compensation - SES AI Corporation 2021 Plan (Details) - shares | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Feb. 02, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock available for future issuance (in shares) | 70,449,992 |  | 237,569,857
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock available for future issuance (in shares) | 2,116,942 |  |
Grants (in shares) | 2,116,942 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock available for future issuance (in shares) | 2,755,058 |  |
Grants (in shares) | 2,920,755 |  |
SES AI Corporation 2021 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock available for future issuance (in shares) | 32,639,849 | 36,862,002 |
Automatic annual increases, term | 10 years |  |
Automatic annual increases, percentage of total shares outstanding (as a percent) | 2.00% |  |

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