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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 $ 201,110 $ 109,135
Capitalized research expenses 71,799 83,785
R&D and other tax credits 79,999 57,901
Stock-based compensation 23,420 18,090
Lease liabilities 10,490 11,592
Accrued expenses and other, net 11,035 7,488
Equity method investment 3,418 3,544
Total deferred tax assets 401,271 291,535
Less: valuation allowance (392,031) (281,784)
Total deferred tax assets after valuation allowance 9,240 9,751
Deferred tax liabilities:    
Right-of use assets (8,750) (9,751)
Other deferred tax liabilities (490) 0
Total deferred tax liabilities (9,240) (9,751)
Net deferred tax assets $ 0 $ 0