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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 67.2 | $ 72.2
Deferred revenue | 1.2 | 7.2
Stock compensation expense | 4.5 | 11.5
Research and development credits | 17.3 | 24.9
Lease right-of-use asset | 22.4 | 15.2
Accrued expenses and liabilities | 14.2 | 7.6
Other, net | 4.5 | 6.4
Total gross deferred tax assets | 131.3 | 145.0
Less valuation allowance | (38.5) | (42.0)
Total deferred tax assets | 92.8 | 103.0
Deferred tax liabilities: |  |
Intangible assets | 104.9 | 144.0
Lease liability | 20.2 | 14.6
Property, plant and equipment | 3.5 | 15.7
Total deferred tax liabilities | 128.6 | 174.3
Net deferred tax liability | $ (35.8) | $ (71.3)

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