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Income Tax - Major components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:      
Net operating loss carryforward $ 58,975 $ 52,948  
Research and development credit carryforward 4,522 1,723  
Stock-based compensation 4,128 3,879  
Section 174 Research and Development Capitalization 15,982 3,553  
Lease liability 1,143 737  
Other 1,260 2,053  
Total deferred tax assets 86,010 64,893  
Deferred tax liabilities:      
Right-of-use assets (1,085) (651)  
Other (174) (226)  
Total deferred tax liabilities (1,259) (877)  
Net deferred tax assets before valuation allowance 84,751 64,016  
Valuation allowance (84,751) (64,016) $ (51,746)
Deferred tax, net $ 0 $ 0