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Income Taxes - Schedule Of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Net operating loss carryforwards $ 125,765 $ 56,006
Basis difference in the equity of AST LLC 457,008 140,668
Research and development credit 25,243 13,223
Other 14,578 3,829
Total deferred tax assets 622,594 213,726
Less: valuation allowance (618,440) (212,127)
Net deferred tax assets 4,154 1,599
Deferred tax liabilities:    
Intangibles (14,902) 0
Total gross deferred tax liabilities (14,902) 0
Net deferred tax assets   $ 1,599
Net deferred tax liabilities $ (10,748)