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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)

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