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Income Taxes - Narrative (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | --- | ---
Operating Loss Carryforwards [Line Items] |  |  |
Accrued interest and penalties related to uncertain tax positions | $ 0 | $ 0 |
Operating loss carry-forwards | 7,100,000 | 8,300,000 | $ 37,300,000
Deferred tax assets, operating loss carry-forwards | 14,510,000 | 12,758,000 |
Deferred tax assets, operating loss carryforwards, portion available after application of IRC Section 382 limitations | 61,500,000 |  |
Operating loss, subject to expiration | 37,300,000 |  |
Net deferred tax liabilities | 0 | $ 0 |
U.S. Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax assets, operating loss carry-forwards | 115,900,000 |  |
State and Local |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax assets, operating loss carry-forwards | $ 72,300,000 |  |

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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 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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