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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets      
Net operating losses $ 64,135 $ 62,619  
Capitalized research and development expenses 141 282  
Credit carryforwards 167,397 167,498  
Deferred compensation 1,181 1,993  
Election out of installment method 820 956  
Accrued expenses 44 44  
Other temporary differences 621 672  
Installment sale tax basis 15,869 15,869  
Total gross deferred tax assets 250,208 249,933  
Valuation allowance $ (250,208) $ (249,933) $ (249,252)