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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
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 | 29,102,000 | 34,190,000
State |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, net | $ 16,829,000 | $ 23,641,000

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