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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 1987
Income taxes |  |  |
Tax bad debt reserve |  |  | $ 3,000
Deferred tax liability not recorded on tax bad debt reserve balance | $ 1,000 | $ 1,000 |
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |  |
Balance at beginning of year | 475 | 475 |
Additions based on tax positions related to the current year |  |  |
Additions for tax positions of prior year |  |  |
Reductions for tax positions of prior years |  |  |
Settlements |  |  |
Balance at end of year | 475 | 475 |
Interest accrued during the period related to unrecognized tax benefits | 4 | $ 5 |
Federal |  |  |
Income taxes |  |  |
Net operating loss carryforwards | 11,300 |  |
Federal | General Business Tax Credit Carryforward |  |  |
Income taxes |  |  |
Tax credit carryforward | 1,300 |  |
Federal | Alternative Minimum Tax Credit Carryforward |  |  |
Income taxes |  |  |
Tax credit carryforward | 192 |  |
California |  |  |
Income taxes |  |  |
Net operating loss carryforwards | $ 28,600 |  |

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