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Income Taxes (Details 3) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income taxes |  |  |
Deferred tax benefit |  | $ 3,400,000 |
Adjustments to provisional amount | $ 0 |  |
Valuation allowance | 31,170,000 | 28,350,000 | $ 40,148,000
Unrecognized tax benefits | 0 | 206,000 | $ 967,000
Interest and penalties | 0 | 0 |
Interest and penalties accrued | $ 0 | $ 0 |
State | Minimum |  |  |
Income taxes |  |  |
Open Tax Year | 2013 |  |
Federal | Minimum |  |  |
Income taxes |  |  |
Open Tax Year | 2015 |  |
Foreign | Minimum |  |  |
Income taxes |  |  |
Open Tax Year | 2015 |  |

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