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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)

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