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Income Taxes - Components of deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets    
Federal net operating loss carryforwards $ 3,672 $ 44,202
State net operating loss carryforwards 967 12,104
Foreign net operating loss carryforwards   98
Research and development (R&D) tax credits 1,649 9,358
Capitalized R&D expenses 2,413 9,312
Start-up costs 11,355  
Stock based compensation 5,812 4,757
Accrued expenses 831  
License Fees 676 840
Other 10,867 297
Total deferred tax assets 38,242 80,968
Valuation allowance $ (38,242) $ (80,968)