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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