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Income Taxes - Schedule of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:      
Capitalized R&D - acquired in merger with Zafgen $ 66,678 $ 66,941  
Capitalized R&D - Section 174 Costs post 2021 9,411 5,019  
Stock based compensation 3,490 2,709  
Net operating loss carryforwards 45,195 42,204  
Tax credit carryforwards 16,319 13,284  
Other temporary differences 21 20  
Accruals & reserves 19 19  
Fixed assets & intangibles 107 81  
Operating lease liability 1,298 1,355  
Total deferred tax assets 142,538 131,632  
Deferred tax liabilities:      
Operating right of use asset (768) (801)  
Total deferred tax liabilities (768) (801)  
Less: Valuation allowance $ (141,770) $ (130,831) $ (124,016)