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Income Taxes - Schedule of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:      
Capitalized R&D - acquired in merger with Zafgen $ 66,678 $ 66,678  
Capitalized R&D - Section 174 Costs post 2021 22,616 9,411  
Stock based compensation 4,879 3,490  
Net operating loss carryforwards 50,177 45,195  
Tax credit carryforwards 28,022 16,319  
Other temporary differences 30 21  
Accruals & reserves 19 19  
Fixed assets & intangibles 119 107  
Operating lease liability 1,196 1,298  
Total deferred tax assets 173,736 142,538  
Deferred tax liabilities:      
Operating right of use asset (708) (768)  
Total deferred tax liabilities (708) (768)  
Less: Valuation allowance $ (173,028) $ (141,770) $ (130,831)