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Income Taxes - Additional Tax Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income taxes |  |
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 | 8 | $ 5
Federal |  |
Income taxes |  |
Net operating loss carryforwards | 7,200 |
Federal | General Business Tax Credit Carryforward |  |
Income taxes |  |
Tax credit carryforward | 1,800 |
Federal | Alternative Minimum Tax Credit Carryforward |  |
Income taxes |  |
Tax credit carryforward | 59 |
California |  |
Income taxes |  |
Net operating loss carryforwards | $ 24,500 |

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