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INCOME TAXES - Deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets      
Outside basis difference in SES Holdings $ 33,695 $ 69,407  
Net operating losses 89,883 95,912  
Credits and other carryforwards 20,300 5,363  
Other 7,827 3,526  
Total deferred tax assets before valuation allowance 151,705 174,208  
Valuation allowance (105,366) (112,282) $ (183,915)
Total deferred tax assets 46,339 61,926  
Deferred tax liabilities      
Property and equipment 365 300  
Other   9  
Total deferred tax liabilities 365 309  
Net deferred tax assets $ 45,974 $ 61,617