Income Taxes - NOL carryforwards (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2017 |
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| Indefinite Carryforward Period | ||
| Operating Loss Carryforwards [Line Items] | ||
| NOL carryforwards | $ 112.5 | |
| Expire at Various Dates Through 2037 | ||
| Operating Loss Carryforwards [Line Items] | ||
| NOL carryforwards | $ 135.7 | |
| Federal | ||
| Operating Loss Carryforwards [Line Items] | ||
| NOL carryforwards | 248.2 | |
| Tax credits | 11.9 | |
| State | ||
| Operating Loss Carryforwards [Line Items] | ||
| NOL carryforwards | 251.7 | |
| Tax credits | $ 2.9 |
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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