Income Taxes - Tax credit carryforwards (Details) $ in Millions |
Dec. 31, 2017
USD ($)
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| Tax credit carryforwards | |
| Unrecognized tax benefits | $ 0.0 |
| Federal | |
| Tax credit carryforwards | |
| Tax credits | 6.1 |
| State | |
| Tax credit carryforwards | |
| Tax credits | $ 1.8 |
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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://www.xbrl.org/2003/role/presentationRef
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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 Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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