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Income Taxes - Tax Credit Carryforwards (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Federal |
Tax credit carryforwards |
Net operating loss carryforward expected to be unutilized amount | $ 10.6
Federal | Research and development credit carryforward |
Tax credit carryforwards |
Tax credit carryforwards | 28.9
Tax credit carryforwards expected to be unutilized amount | 0.3
State | Research and development credit carryforward |
Tax credit carryforwards |
Tax credit carryforwards | 12.8
Tax credit subject to expiration beginning in 2023 | 2.9
Tax credit not subject to expiration | $ 9.8

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