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Income Taxes - Schedule of Temporary Differences That Give Rise to Significant Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets      
Net operating losses $ 65,194 $ 64,135  
Capitalized research and development expenses   141  
Credit carryforwards 167,017 167,397  
Deferred compensation 1,177 1,181  
Election out of installment method 820 820  
Accrued expenses 44 44  
Other temporary differences 366 621  
Installment sale tax basis 15,869 15,869  
Total gross deferred tax assets 250,487 250,208  
Valuation allowance $ (250,487) $ (250,208) $ (249,933)