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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 22, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |
Research and development tax credits utilized |  | $ 2.4 |  |
Tax credit carryforwards subject to expiration |  | 1.9 |  |
Release of valuation allowance |  | 287.2 |  |
Valuation allowance amount |  | 55.5 | $ 332.2 |
Additional stock-based compensation expense | $ 32.0 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 23.5 | $ 0.0 | $ 0.0
Possible extension period of tax holiday |  | 3 years |  |
Undistributed foreign earnings |  | $ 1.4 |  |
California and Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance amount |  | 55.5 |  |
Additional Paid-In Capital |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Release of valuation allowance |  | 1.7 |  |
Income Tax Expense (Benefit) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Release of valuation allowance |  | 285.5 |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Decrease in foreign taxes from tax holiday |  | $ 0.1 |  |

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