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INCOME TAXES - Deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Outside basis difference in SES Holdings $ 78,918 $ 27,935
Federal net operating loss carryforward 69,601 46,782
Federal net operating loss carryforward expires beginning in 2031 133,800  
Federal net operating loss carry forward with no expiration 157,800  
State NOLs 128,100  
Foreign NOLs 6,500  
Credits and other carryforwards 4,111 1,451
Other 541 944
Total deferred tax assets before valuation allowance 153,171 77,112
Valuation allowance (152,659) (76,883)
Total deferred tax assets 512 229
Deferred tax liabilities    
Property and equipment 718 540
Other 41 32
Total deferred tax liabilities 759 572
Net deferred tax (liabilities) $ (247) $ (343)