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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration start year | 2021 |
Operating loss carryforwards, expiration end year | 2035 |
Federal alternative minimum tax credit carryforward | $ 2,855,000 | $ 2,855,000
Tax credit carryforwards, annual limitation on use amount | 3,696,000 |
Uncertain tax position | 0 | 0
EJ Acquisition |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards, annual limitation on use amount | 341,000 |
NBI Acquisition |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards, annual limitation on use amount | 2,040,000 |
ColoEast Acquisition |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards, annual limitation on use amount | 1,906,000 |
Federal |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, net | 34,190,000 | 39,055,000
State |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, net | $ 29,178,000 | $ 34,500,000

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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