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Income Taxes - Additional Tax Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 1987
Income taxes |  |  |
Tax bad debt reserve |  |  | $ 3,000
Deferred tax liability not recorded on tax bad debt reserve balance | $ 632 | $ 632 |
Tax bad debt deduction under the new method | $ 4,300 |  |
Taxable income evenly term | 4 years |  |
Unrecognized tax benefits if recognized would favorably affect income tax provision in future | $ 475 | 475 |
Interest accrued during the period related to unrecognized tax benefits | 5 | $ 5 |
Federal |  |  |
Income taxes |  |  |
Net operating loss carryforwards | 8,200 |  |
Federal | General Business Tax Credit Carryforward |  |  |
Income taxes |  |  |
Tax credit carryforward | 1,500 |  |
Federal | Alternative Minimum Tax Credit Carryforward |  |  |
Income taxes |  |  |
Tax credit carryforward | 119 |  |
California |  |  |
Income taxes |  |  |
Net operating loss carryforwards | $ 25,300 |  |

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