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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Statutory corporate tax rate | 21.00% | 35.00% | 35.00%
Tax cuts and jobs act of 2017, accounting complete | true |  |
Unrecognized tax benefits | $ 0 | $ 0 | $ 0
Federal General Business Tax Credit Carry Forward [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carry forwards | 0 |  |
Alternative Minimum Tax Credit Carry Forward [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carry forwards | 0 |  |
State [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carry forwards | $ 35,100,000 |  |
Net operating loss carry forwards expiration date | Dec. 31, 2025 |  |
Internal Revenue Service [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Open tax years | 2011 2012 2013 2014 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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