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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 64,352 $ 64,147
Research credit carryforwards 27,797 19,623
Stock compensation 11,374 11,994
Other 19,668 13,120
Deferred tax assets 123,191 108,884
Valuation allowance for deferred tax assets (36,283) (24,858)
Net deferred tax assets 86,908 84,026
Deferred tax liabilities:    
Identified intangibles (102,221) (119,381)
Other (9,300) (4,923)
Net deferred tax liabilities (111,521) (124,304)
Deferred income taxes, net $ (24,613) $ (40,278)