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Stock-Based Compensation - General Information (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2021 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Feb. 02, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common stock available for future issuance (in shares) |  | 78,010,211 | 76,795,708 |  |
Options outstanding (in shares) |  | 5,431,725 | 6,063,110 | 13,619,793 | 20,748,976
SES AI Corporation 2021 Plan |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common stock available for future issuance (in shares) |  | 38,518,171 | 37,263,345 |  | 36,862,002
Increase in total shares reserved for future issuance (in shares) | 486,975 |  |  |  |
Automatic annual increases, term |  | 10 years |  |  |
Automatic annual increases, percentage of total shares outstanding (as a percent) |  | 2.00% |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common stock available for future issuance (in shares) |  | 13,883,881 | 13,282,923 |  |
Awards outstanding (in shares) |  | 13,883,881 | 13,282,923 | 6,359,474 |
Vesting period |  | 3 years |  |  |
Restricted Stock |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Awards outstanding (in shares) |  |  | 255,458 | 649,567 | 2,273,727
Restricted Stock | Share-Based Payment Arrangement, Tranche One |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting (as a percent) |  | 25.00% |  |  |
Vesting period |  | 1 year |  |  |
Restricted Stock | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting (as a percent) |  | 2.0833% |  |  |
Vesting period |  | 1 month |  |  |
Performance Shares |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common stock available for future issuance (in shares) |  | 5,963,154 | 5,973,050 |  |
Awards outstanding (in shares) |  | 5,963,154 | 5,973,050 | 3,364,810 |
Vesting period |  | 3 years |  |  |
Performance Shares | Share-Based Payment Arrangement, Tranche One | Minimum |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 2 years |  |  |
Performance Shares | Share-Based Payment Arrangement, Tranche One | Maximum |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Earn-out Shares, Earn-out Restricted Shares |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Awards outstanding (in shares) |  | 742,280 | 765,990 | 1,619,998 |
Vesting period |  | 5 years |  |  |
Employee Stock Option |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common stock available for future issuance (in shares) |  | 5,431,725 | 6,063,110 |  |
Expiration period |  | 10 years |  |  |
Share-Based Payment Arrangement, Additional Disclosure [Abstract] |  |  |  |  |
Income tax benefit |  | $ 0 |  |  |
Employee Stock Option | Share-Based Payment Arrangement, Tranche One |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting (as a percent) |  | 25.00% |  |  |
Vesting period |  | 1 year |  |  |
Employee Stock Option | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting (as a percent) |  | 2.0833% |  |  |
Vesting period |  | 1 month |  |  |

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