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Income Taxes - TCJA and Net operating loss carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |
Increase (decrease) in deferred tax asset valuation allowance | $ (12.4) |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Income tax refund |  | $ 0.8 | $ 0.8
Cumulative net operating loss carryforwards | 168.2 |  |
Tax credit carryforwards | $ 34.0 |  |
Tax credits expiring in next five years |  |  | $ 0.5
Period to use tax credit carryforward | 4 years |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Cumulative net operating loss carryforwards | $ 161.6 |  |
Tax credit carryforwards | 17.8 |  |
Years Prior to 2018 | Federal |  |  |
Income Taxes [Line Items] |  |  |
Cumulative net operating loss carryforwards | 63.9 |  |
Years After 2018 | Federal |  |  |
Income Taxes [Line Items] |  |  |
Cumulative net operating loss carryforwards | $ 104.3 |  |

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