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Income Taxes - Summary of Federal Net Operating Loss Carryforwards and Related Deferred Income Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Contingency [Line Items] |  |
Deferred Tax Asset | $ 5.5 | $ 31.8
Internal Revenue Service (IRS) [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 26.1 |
Deferred Tax Asset | 5.5 |
Internal Revenue Service (IRS) [Member] | 2020 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 3.9 |
Deferred Tax Asset | 0.8 |
Internal Revenue Service (IRS) [Member] | 2021 through 2025 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 17.8 |
Deferred Tax Asset | 3.8 |
Internal Revenue Service (IRS) [Member] | 2026 through 2030 [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL Carry-forwards | 4.4 |
Deferred Tax Asset | $ 0.9 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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